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AMD A10-7850K Black Edition Processeur 4 cœurs 3,7 GHz Socket FM2+ Box

2.7 étoiles sur 5 3 commentaires client

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  • Description du produit: AMD A10-7850K, A series
  • Famille de processeur: AMD A10
  • Fréquence du processeur: 3,7 GHz
  • Socket de processeur (réceptable de processeur): Socket FM2+
  • Memory types supported by processor: DDR3-SDRAM
  • Memory clock speeds supported by processor: 2133 MHz
  • On-board graphics adapter base frequency: 720 MHz
  • Enveloppe thermique (TDP, Thermal Design Power): 95 W
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Informations sur le produit

Descriptif technique
MarqueAMD
Numéro du modèle de l'articleAD785KXBJABOX
sériesA10-7850K
Couleur Argent
Garantie constructeurGarantie Fabricant : 3 an(s)
Plate-forme du matériel informatiquePC
Description du clavier Français
Vitesse du processeur3.7
Nombre de coeurs4
Socket du processeur FM2+
Item dimensions L x W x H14 x 12.7 x 7.1 centimeter
Poids du produit300 grammes
  
Informations complémentaires
ASINB00H7Z7YMI
Moyenne des commentaires client 2.7 étoiles sur 5 3 commentaires client
Classement des meilleures ventes d'Amazon 4.642 en Informatique (Voir les 100 premiers)
Date de mise en ligne sur Amazon.fr10 décembre 2013
  
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Descriptions du produit

AMD A10-7850K Black Edition Processeur 4 cœurs 3,7 GHz Socket FM2+ Box


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2.7 étoiles sur 5
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Meilleurs commentaires des clients

Par Gilbert le 23 juillet 2014
Achat vérifié
Aucun reproche à faire sur ce processeur
Je connais cette série de longue date.
Je le recommande à tous ceux qui ne désirent pas, dans un 1er temps, acheter une carte graphique
Remarque sur ce commentaire 7 personnes ont trouvé cela utile. Avez-vous trouvé ce commentaire utile ? Oui Non Commentaire en cours d'envoi...
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Achat vérifié
Bonjour, j'ai commander ce produit en avant première et je suis déçu d'une chose principale, le radiateur.
Je croyais voir un radiateur des années 2000 !
Très mauvaise note pour AMD sur ce coup surtout vu la puissance de l'APU, j'ai pas essayé mais je suis certain qu'il doit attendre des temperatures folle (j'ai déja vu 40° en idle donc j'imagine pas en jeu.)
resutat je commande un nouveau ventirad chez cooler master.
3 commentaires 3 personnes ont trouvé cela utile. Avez-vous trouvé ce commentaire utile ? Oui Non Commentaire en cours d'envoi...
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Beaucoup de pub mais pas beaucoup de performances!!!la partie graphique du processeur ne s ajoute pas a ma carte 7870 donc ça sert a rien de l acheter si le processeur marche qu a moitié ou alors valable juste pour un petit ordi de bureau!
Achetez plutot un fx 8320 ou fx 8350 si vous voulez de la pêche!
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205 internautes sur 216 ont trouvé ce commentaire utile 
HASH(0x93c31360) étoiles sur 5 The world's most powerful APU (for now.) An in-depth analysis. 7 février 2014
Par Ken Mishima - Publié sur Amazon.com
Well, after much ruckus, many delays, and endless speculation around the interwebs, Kaveri has finally launched. If you're reading this, I'm assuming you're here because you have some questions. What is this chip capable of? What *is* an APU? Should I buy this? I'll answer questions like these and do my best to give an easy-to-understand, in-depth analysis of what this piece of silicon is all about.

=====================
I. HSA and a parallel future
=====================
This chip is a 3rd generation APU, and pretty much the first "true" APU in that it is capable of "HSA". HSA stands for Heterogeneous System Architecture, where the goal is achieving supreme performance while maintaining high efficiency. When utilized properly, this very chip could out-perform a much more expensive and power-hungry CPU + GPU combo. This is due to things like the fact that Kaveri supports things like "hUMA", or Heterogeneous Uniform Memory Access, which allows the CPU and GPU (the on-die GPU) to access the same pool of system memory at the same time and easily and quickly communicate with each other.

This eliminates the need for the CPU and GPU to waste precious cycles copying data to pointers and passing them back and forth, which causes high latency, causing lower efficiency. Think of it this way:

Without hUMA: Two musicians are collaborating on an ambitious new-wave bossa nova project, but one musician lives in California while the other lives in New York. They can compose bits of music and come up with ideas, but have to send said information across the country multiple times to each other just to get any actual work done. This takes a long time and while eventually the songs will be created, it'll be ages before that debut EP gets released.

With hUMA: Two musicians are collaborating on the same type of project as the other two musicians, except that these musicians share a flat together and they go into their home studio to work on their music. They can very quickly and easily come up with ideas and get the music recorded as a result. Coincidentally, they are also doing a new-wave bossa nova project and they get the work done so quickly and efficiently that they're able to get their debut ALBUM, titled "The Kaveri Sessions" released an entire year before the cross-country musicians do. The album goes triple-Platinum within six months.

ANYWAY, you get the idea. OpenCL apps and other such programs coded with HSA in mind have already shown impressive boosts (just google it, you'll find them easily). I just wanted to get this out of the way first, because many reviewers from other so-called professional websites seem to gloss over the fact that HSA is a pretty big deal, and is the main feature of this chip.

=================
II. Features
=================

The A10-7850k is a true quad-core processor and has a relatively powerful GPU integrated straight onto the die. The CPU on this model is clocked at 3.7ghz for the base clock, and under specific scenarios can turbo to 4.0ghz. The GPU clock is 720 MHz by default. As this processor is a "Black Edition" or "unlocked" SKU, the chip is yours to play with. You can overclock the GPU, the CPU cores, the northbridge, the system RAM, whatever -- have at it. I'll talk more about overclocking results later.

Obviously this processor will only work in FM2+ socket motherboards. Make sure you know what BIOS revision the motherboard you get has before you get this processor, as it may need to be flashed before it can actually POST and/or boot with Kaveri installed. If this happens, you'll have to buy another FM2 (non-Kaveri) chip just to flash the BIOS temporarily. If this happens to you, I'd recommend a low-end A4 chip or FM2 Athlon to flash the BIOS.

======================
III. Practical Use Scenarios
======================

Going off today's price for this chip (~$180 as of the day this review was posted), this isn't a good buy for the average consumer. This is targeted towards power users like gamers or those who use certain productivity apps. This chip will shine with HSA apps, but currently they are few and far between besides several benchmarks and such.

This chip runs very cool, much cooler than previous-generation APU's. Even on the stock CPU cooler, it's easy to reach a 4.1ghz CPU overclock without needing to increase the vCore (CPU voltage) or running into a thermal wall.

Power consumption is also comparatively lower than previous-gen APU's. The chip uses very little power when idle and at stock clocks, uses less than Richland at full-load. The 28nm SHP BULK process was indeed APU-balanced and Kaveri shines at lower TDP brackets.

Despite what many naysayers will proclaim, this chip will blaze through a vast majority of common desktop applications without breaking a sweat. Browsing the web, watching youtube, chatting with friends on Facebook, doing some image editing? Pfft, Kaveri doesn't care. It's just "whatever".

=================
IV. Gaming
=================

Gaming is where things get a little iffy. Compared to Richland, there can either be relatively big gains or hardly any gains at all. This is mainly due to the fact that the iGPU (integrated GPU) is heavily bandwidth-starved, as it uses the system memory (dual-channel DDR3) for the VRAM. You can only get so much bandwidth out of a dual-channel DDR3 setup before you're totally bottlenecked, and this shows when you play recent games at higher resolutions such as 1080p. Granted, these games will still usually be very playable, but for the best experience, you'll want to stick to lower resolutions such as 720p and perhaps 900p depending on the game.

Slightly older games will run quite well however, and you can take a quick trip to YouTube to see proof of this. This chip is *not* meant for ultra-high resolution gaming with all the bells and whistles turned on. That is not even physically practical, and the fact that people expect such a thing is quite ludicrous. For onboard visuals however, Kaveri is impressive, and definitely capable of running any modern game at playable framerates provided you know how to tweak the in-game settings to get a better framerate.

====================
V. Architectural Changes
====================

The CPU cores use the 3rd generation Bulldozer-family "SteamrollerB" cores, and the GPU is GCN (Graphics Core Next) 1.1-based Volcanic Islands-derived. The processor is based on Global Foundries' 28nm SHP (Super High Performance) BULK CMOS node. This node seems to have been tailor-made for AMD, as it is well-balanced for APU's -- a stark contrast to GloFo's previous 32nm FD-SOI node, which was CPU-biased.

As a result of this move to BULK, the processor doesn't scale well past 4.4ghz -- in fact, the average max stable overclock for this chip on the CPU side is 4.5ghz. I've seen several people reach 4.6ghz, but 4.4~4.5ghz seems to be the sweet spot. I've even seen reports of several people reporting higher benchmark results with 4.4ghz or 4.5. 4.5ghz isn't a thermal wall, but a hard wall imposed by the process lithography. Don't expect any crazy Richland 6800k-style 5.0ghz overclocks on air with this one.

That said, Kaveri offers a 10~20% raw IPC increase on the x86 side of things, which offset the reduction in stock clocks compared to Richland (4.1/4.4 base/turbo respectively.) Depending on the application you're in, SteamrollerB cores on average can provide anywhere from a 0~30%+ IPC increase clock for clock compared to Piledriver. That's pretty impressive for a single generational leap. However, the average gain is about 10%, which is still decent, and you can squeeze out more performance with some simple overclocking.

In terms of die logic, we see the two integer units in a module receive their own independent instruction decoders, which improves multi-threaded performance. The fetch stage is still shared, however this doesn't seem to impact MT (multi-threaded) scaling in a negative manner much.

Store/load handling got some big improvements, instruction scheduling efficiency improved by roughly 5~10% as a result of the improved front-end, branch mis-predictions were lowered by 20%, instruction-cache misses were reduced by 30%, and there is a 25% max-width dispatch capability per thread. These improvements account for the improved single-threaded performance you can see in various benchmarks and experience in real-world apps.

It is worth noting that the FPU itself seems to have been slightly gimped somehow in SR-B. The FPU performance is down by roughly ~15%+ in some benchmarks. My own educated guess is that Excavator (arriving in early 2015 with the Carrizo APU) will further beef up the FPU as well as other components such as the integer units themselves.

The GPU is GCN-based, a first for these APU's. Even with the two extra GPU CU's (compute units, or GCN cores) on this model (for a total of 512 stream processors, over the 6800k's 384), the previously-mentioned memory bandwidth bottleneck restricts this APU from granting a massive lead over the previous-gen parts. However, the gains are present and what you would expect from a new generation part. There are 8 GCN CU's, which can clock anywhere from 0mhz (idle) to 720mhz (default boost clock.)

Overall the APU is quite powerful for what it is, but even with the x86 IPC gains, AMD isn't close to catching up to Intel's Haswell chips in terms of single-threaded grunt. This isn't really a major concern for consumers however, and not AMD either, as HSA is proving. Legacy ST apps will still run well enough on this chip. Budget gamers will be well-advised to throw in a more powerful discreet GPU in their rig later to greatly enhance their experience (this chip can do Dual Graphics with up to an R7-250, any higher and Dual Graphics won't work, as it would be rendered moot.)

==============
VI. Overclocking
==============

For this testimonial, my experiences with the OC'ing was done from an AsROCK Extreme6+ A88x board, a fairly common and popular choice for the FM2+ platform. For cooling, I used the venerable Cooler Master Hyper 212+. RAM used was 2x sticks of 4GB G.Skill Sniper Series DDR3 memory.

I didn't touch the reference clock, since I run my HDD in AHCI mode, and if the ref. clock is taken past 106mhz, the system becomes unstable and refuses to boot for me, so I left this setting at the default 100mhz. I think if you use IDE mode instead, this problem doesn't occur.

As previously mentioned, on my sample it was easy to take the CPU to 4.1ghz on default voltage on the stock AMD cooler. Pushing past 4.1ghz, I slapped on the CM 212 and made it to 4.5ghz with voltage at 1.45v stable. Any higher than 4.5ghz and the system would crash in Windows the moment any serious load was placed on the CPU. This was done with just quick and easy adjustments to the CPU multiplier and voltage.

The iGPU is where some will be scared breathless. I have prior experience with APU's, starting out with overclocking the A8-3850 back in the day. For this 7850k however, you have many variables to play with to get more performance out of the iGPU. You can grant more voltage to the iGPU section of the APU by increasing the NB (Northbridge, which is also integrated directly onto the die ever since the FM1 days) voltage. I found that an increase to the NB voltage wasn't necessary, but some may need to do so when overclocking the RAM.

I set the RAM voltage at 1.75v, and got it at 2400mhz no problem. The iGPU clock was boosted from 720mhz to 950mhz without much trouble. I didn't try past that, though I've heard of people getting past the 1ghz barrier.

Higher RAM frequency directly affects graphics performance, thus overclocking the RAM can grant some free performance boosts. E.g. RAM @ 1866 gets 40fps in x game, OC RAM to 2400mhz and get 52fps in x game.

Overclocking Kaveri is pretty fun, and depending on your knowledge of APU's, can be fairly easy. As mentioned before, every piece of silicon is different, thus some people will need different settings to achieve stability even if they have the exact same hardware. If you need help with OC'ing, feel free to ask in the comments section.

=============
VII. Conclusion
=============

All things considered, the 7850k is a great product for what it is, and it's full potential isn't even realized yet. My biggest complaint currently is the price -- this chip is overpriced right now. It should have replaced the Richland flagship for the $150 spot. Hopefully they drop the prices for this and the 7700k soon, as the prices don't make much sense right now.

Users looking for a new chip for a HTPC should target the 7700k or the upcoming A8-7600 models instead, as this model is overkill. However, if for whatever you wish to jump for this chip, you can set your own TDP target in the BIOS, e.g. change the TDP target to 45W and Kaveri will dynamically alter clocks based on workload to never exceed a 45W TDP. This would make a quiet, cool-running chip even quieter and cooler-running than it already is.

*Phew!* Everything considered, I give this a 5/5.
72 internautes sur 78 ont trouvé ce commentaire utile 
HASH(0x93df02d0) étoiles sur 5 The A10-7850K is a true & complete budget gaming system. i3 comparisons are pointless because they double the cost 2 avril 2014
Par William N - Publié sur Amazon.com
Some people seem to be completely missing the point with inane comments like "An Intel i3 with a Radeon HD 7700 video card would bury this".

I bought this processor in a CPU bundle with the ASRock FM2A88M-HD+ for $159.xx total at a well-known microcomputer center. The APU by itself was $129 + another $29 for the motherboard when bundled. Actually could have got an even cheaper "free with bundle" ASUS A55BM-E but I wanted the 88X chipset and was willing to pay an extra $29 to get it. With the stock AMD fan and heatsink it clocks at 4.1 GHz stable right out of the box. Why use the stock fan? Because I am a cheapskate that's whay, and spending another $70-80 for a liquid cooler to squeeze another 0.4 GHz out of the A10-7850K is not a value proposition to me. I got a modest 100 MHz overclock with the stock CPU cooler, but it didn't cost me a dime extra.

Now if you bought a i3-4340 + Z87 motherboard combo it would cost $224 at that same store, but wait, a HD 7770 is another hundred bucks on top of that. And believe me you will need that video card upgrade because the Intel i3's internal graphic processor has no graphics capability whatsoever. Now your "Kaveri beater" is already at $324 -- more than twice what I paid for this A10-7850K with the motherboard.

But wait now you have to add a case and power supply. I got a "free after rebate" $20 case that comes with a 300 watt PSU. It is more than ample power to run the 95 watt A10-7850K, hard drive and DVD burner. The highest I have ever seen is about a 120 watt reading with the Kill A Watt power meter during gaming. Now the HD 7770 requires at least a 400 watt power supply the graphics card itself draws 75 watts. It requires a power plug for the video card -- something a 300W power supply does not even have. Add in the price of your 400W power supply and case for that Intel i3 solution.

I added 8 GB of DDR3 2133 memory (2x4GB) for another $72 -- if I wanted to stick with DDR 1600 could have done it cheaper but there is a direct improvement to the A10-7850K video IGP speed by using the faster RAM. The RAM easily overclocks to 2400 MHz.
34 internautes sur 38 ont trouvé ce commentaire utile 
HASH(0x94501a80) étoiles sur 5 Absolutely the best in it's class!!! 1 février 2014
Par Elijah and Jenny - Publié sur Amazon.com
Achat vérifié
I love having top of the line hardware, and this apu is exactly that! The 7850k brings Battlefield 4 in at 40 FPS, and Crysis 3 in at 30 FPS! Blindingly fast in AutoCAD and Adobe Premiere! Try LibreOffice with HSA enabled and buckle your seatbelt! I will definitely suggest this product, as well as any other Kaveri apu to my friends and family.
28 internautes sur 33 ont trouvé ce commentaire utile 
HASH(0x95b28848) étoiles sur 5 Love it 24 janvier 2014
Par Bofa - Publié sur Amazon.com
Just bought this APU. Absolutely love it. Fast, runs BF4 and bunch of other games on high settings like a champ. Did I mentioned I don't have graphics card. My rig is super cheap. My recommendation is: buy this APU !
12 internautes sur 13 ont trouvé ce commentaire utile 
HASH(0x93ccb678) étoiles sur 5 Another nice effort from AMD 13 mai 2015
Par cmont - Publié sur Amazon.com
Achat vérifié
A nice APU if you have "realistic" expectations about what it is and isn't. It IS a great APU that has enough built in graphic power to power a day to day work, web, email machine and be able to do some "moderate" gaming at lower resolutions and FPS. I ISN'T a high power gaming platform! It will be hit or miss what games and resolutions you will be able to play. Trial and error plus reviews will tell you what works with this APU. I can tell you that this chip really needs the fastest RAM speeds for full performance. IMO 2133 MHz or faster DIMMS. Overall I like where AMD is going with their APU's so we should see even better stuff down the road. For now though the 7850K is the boss.

I used this APU in a new build for my daily driver. Used a Fractal Define R4 case, ASUS A88X-PRO motherboard, ADATA XPG V1.0 OC Series 16GB DDR3 2133MHZ memory. I didn't use the stock cooler that came with the chip, I installed a CoolerMaster Hyper 212 evo due to the fact that this is a 95 watt chip and tends to run a bit hotter. My uses are primarily web, streaming HD content, email, light video editing, and recording music. The APU delivers everything I need for that. Easily driving my HP 25bw and 23bw monitors at native resolution.

Machine booted up perfectly first time and has run stable with a fresh install of Win 8.1. I was able to use the auto overclocking feature on the ASUS A88X to get an overclock of 4558.0 MHz on the CPU and 960.0 MHz on the GPU with the system remaining stable. IMO If you're looking for an APU build you can't go wrong with this chip.
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