Testing Platform

For our Kaveri testing AMD sent us two APUs – the top 95W A10-7850K SKU and the configurable TDP version of the A8-7600 APU, the latter of which can be set at 45W or 65W through the BIOS. The A8-7600 was tested in both power configurations, ultimately the difference between them both being only a few hundred MHz. The 65W configuration is only 200 MHz off the A10-7700K base frequency, and incidentally they both turbo to the same frequency of 3.8GHz.

Kaveri will be the first APU put through the mangle in terms of my new 2014 benchmarking suite, focusing on more compute tasks, video conversion in different software, and more real world scenarios geared for the prosumer.

We must thank the following companies for their contribution to the test beds:

Our test setup for AMD is as follows:

AMD APU TestBed
  SKU Cores CPU /
Turbo
DRAM
MHz
Power IGP SPs GPU
MHz
Kaveri APUs A10-7850K 2M/4T 3.7 GHz
4.0 GHz
2133 95W R7 512 720 MHz
A8-7600 2M/4T 3.3 GHz
3.8 GHz
2133 65W R7 384 720 MHz
A8-7600 2M/4T 3.1 GHz
3.3 GHz
2133 45W R7 384 720 MHz
Richland APUs A10-6800K 2M/4T 4.1 GHz
4.4 GHz
2133 100W 8670D 384 844 MHz
A10-6700T 2M/4T 2.5 GHz
3.5 GHz
1866 45W 8650D 384 720 MHz
A8-6500T 2M/4T 2.1 GHz
3.1 GHz
1866 45W 8550D 256 720 MHz
Trinity APUs A10-5800K 2M/4T 3.8 GHz
4.2 GHz
2133 100W 7660D 384 800 MHz
A8-5500 2M/4T 3.2 GHz
3.7 GHz
1866 65W 7560D 256 760 MHz
Memory AMD Radeon 2 x 8 GB DDR3-2133 10-11-11 1.65V
G.Skill RipjawsX 4 x 4 GB DDR3-2133 9-11-11 1.65V
G.Skill RipjawsZ 4 x 4 GB DDR3-1866 8-9-9 1.65V
Motherboards ASRock FM2A88X Extreme6+
ASRock FM2A88X-ITX+
Power Supply OCZ 1250W ZX Series
Storage OCZ 256GB Vertex 3 SSDs
Operating System Windows 7 64-bit SP1 with Core Parking updates
Video Drivers Graphics Driver Build 13.300 RC2 for Radeon R7
Catalyst 13.12 for all others

Unfortunately we were not able to source a 65W Richland part in time, however a midrange 65W Trinity part was on hand. The important thing to note is that within each power bracket, both the CPU frequencies and the supported memory changes depending on the architecture and the binning process AMD uses. The benchmarks in this review are run at the processors' maximum supported frequency, rather than any AMD Memory Profiles which the processor can also support via overclocking. This has implications in conjunction with the IPC or MHz difference.

For this review we also took a few Intel processors of varying TDPs:

Intel TestBed
  SKU Cores CPU /
Turbo
DRAM
MHz
Power IGP SPs GPU
MHz
Sandy Bridge i5-2500K 4C/4T 3.3 GHz
3.7 GHz
1600 95W HD 3000 12 850
Ivy Bridge i3-3225 2C/4T 3.3 GHz 1600 55W HD 4000 16 550
i7-3770K 4C/8T 3.5 GHz
3.9 GHz
1600 77W HD 4000 16 550
Haswell i3-4330 2C/4T 3.5 GHz 1600 54W HD 4600 20  
i7-4770K 4C/8T 3.5 GHz
3.9 GHz
1600 84W HD 4600 20  
i7-4770R
+ Iris Pro
4C/8T 3.2 GHz
3.9 GHz
1600 65W HD 5200 40  
Memory ADATA XPG 2 x 8 GB DDR3L-1600 9-11-9 1.35V
Motherboards ASUS Z87 Gryphon
Power Supply OCZ 1250W ZX Series
Storage OCZ 256GB Vertex 3 SSDs
Operating System Windows 7 64-bit SP1 with Core Parking updates
Video Drivers 15.28.20.64.3347 for HD 3000
15.33.8.64.3345 for HD 4000+4600

Unfortunately our stock of i5 and i3 processors is actually rather limited – Intel prefers to source the i7s when we review those platforms, but I was able to use a personal i3-3225 from my NAS and we sourced the Haswell i3 as well. Given that Ganesh has the BRIX Pro in for review, I asked him to run as many benchmarks from our gaming suite as I could, to see how well Intel's Haswell eDRAM (Crystalwell) equipped processors stand up to Kaveri’s GCN mêlée.

For reference we also benchmarked the only mid-range GPU to hand - a HD 6750 while connected to the i7-4770K.

Overclocking and Underclocking the A10-7850K

As part of the final testing for this review we did some basic overclocking on the A10-7850K processor. Despite our processor being an engineering sample, we would assume that it is as close/identical to the retail silicon as you can get, given that this is meant to be a review on which people make purchasing decisions.

Our A10-7850K CPU starts out with a peak voltage under load of 1.24 volts when running OCCT. From this point we clocked back to 3.5 GHz and 1.100 volts, with a full-on CPU load line calibration and adjusted turbo mode to equal the base clock. Our standard overclocking test applies – OCCT for five minutes, PovRay, and new for 2014, a run of LuxMark. At our settings, we test the system for stability by running these tests. If the system fails, the CPU voltage is raised 0.025 volts until the system is stable during testing. When stable, the system multiplier is then raised and our testing moves on to the new MHz range.

Our results are as follows:

There was an unexpected jump in the voltage required to move from 3.5 GHz to 3.6 GHz (likely hitting the limits of what we can easily attain on this process). The system would not remain stable until 1.225 volts as set in the BIOS.

We also did the power tests, measuring the power draw at the wall as the delta between idle and OCCT load:

As expected, raising the voltage has a significant effect on the power consumption of the processor. One thing I should point out is that even at stock, the power delivery VRMs were getting very hot to touch – so much in fact that the system generated significant errors without an active fan on them. This got worse as the system was overclocked. I am not sure if this is an effect of the platform or the motherboard, but it will be something to inspect in our motherboard reviews going forward.

The Kaveri Socket and Chipset Line Up: Today and Q1, No Plans for FX or Server(?) CPU Performance
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  • ImSpartacus - Thursday, January 16, 2014 - link

    "Whether or not AMD decides to develop an APU with more than 8 GCN CUs is another matter. This is a point we've brought up with AMD internally and one that I'm curious about - do any AnandTech readers have an interest in an even higher end APU with substantially more graphics horsepower? Memory bandwidth obviously becomes an issue, but the real question is how valuable an Xbox One/PS4-like APU would be to the community."

    I would love to see a massive APU with a Pitcairn-sized GPU. I wouldn't mind if it required a 130-150+W TDP.

    I love seeing machines like the 4770R-powered Brix Pro. Valve obviously likes it as well, because it became the Steam Box sent to developers.

    If I'm getting the performance of a ~$200 GPU, I'd happily pay $300 to get the CPU baked in. I'm hoping DDR4 will allow Intel or AMD to pursue this kind of market.
  • Haravikk - Friday, January 17, 2014 - link

    I'm really interested to find out what the dual graphics performance will be like now that AMD's APUs are much more up-to-date at long last.

    CrossFire using an APU and a discrete GPU has been entirely underwhelming thanks to how limited compatibility was, so much so that you are always better off fitting a better discrete GPU instead. The only case it remained interesting was for small form factors where the more limited range of low-profile cards (and less aggressive pricing) meant that compatible cards weren't always so far behind newer ones.

    But with GCN graphics, HSA and Mantle on the way, maybe we might finally see the benefit of pairing the two rather than just using a better pure CPU and discrete graphics. Of course, we could see some benefit already if more games used OpenCL for physics, since that at least would run quite well on an APU even if the discrete GPU still did all the heavy graphical work.
  • Klimax - Friday, January 17, 2014 - link

    Tests are very incomplete. Where are CPU+GPU results? AMD markets APU as total solution, so as such it should be tested. So far I have seen only Luxmark set of results on TechReport and when CPU+GPU was set, APU lost, because CPU part is sufficiently weak, that not even powerful GPU was able to save it.

    Also some OpenCL tests are not marked whether CPU+GPU or GPU-only, which can skew things badly.
  • eanazag - Friday, January 17, 2014 - link

    I think this article is good, but it deserves and needs some dings on it because it is on Anandtech. When we look at the benchmark section there is a disconnect between this article (the applications used for benchmarking) and the Bench portion of the website. I have enjoyed and trusted the bench methodologies used on this site over the years and find it a resource I come back to, to help me make purchasing and hardware decisions because of the bench. Over time I will find it difficult to compare findings without the bench. I have no problem with you updating the bench as what has been done with SSDs and GPUs. I just think this article overlooked what becomes the real value of what this site offers if you overlook the ongoing bench portion of this site. I looked in the bench and haven't really seen a whole lot of anything recent on AMD APUs in the bench. That's my first ding.

    I suspect that if Anand was excited about AMD's release and had reviewed this product we would have gotten a better appreciation of what Kaveri brings to the table. I got the message that the 45W part is a very good in its segment and may be something worth considering, but I did not get what is mentioned in the article. What's the reality of running Kaveri on 1080p? You gave us the high settings, but no one with any sense is going to settle for less than 12 fps. So what are the realistic settings that will give us 20/30+ fps (game depending) performance. What are we really able to work with. I understand Anand is busy and likely not excited about another AMD CPU product release. I get it; it is hard to get excited about desktop and higher wattage laptop parts for AMD because they have been lack luster & underwhelming year over year for so long. I think this product fits in more than just the 45W space, but I didn't get that answer. I am still wondering, which is not what I would normally get at Anandtech. Normally, I would be getting more than I expected from a review. That's my second ding.

    This next is a general ding about the bench. You guys do great work here. I am on here about every day. The bench could use some tweaking in relation to the CPU and GPU between laptop and desktop and to an extent mobile. I want to know how a mobile GPU/CPU matches up to a desktop variant. Sometimes I even want to know how they match up in mobile devices (tablets and phones). I have gotten some of that info from articles, but it is rough matching up that info in the mobile (laptop) bench. Sometimes I do want to look at specific laptop info, but most of the time I am just considering the guts of the device. I decide between the trade offs of desktops to laptops in applications. The information is here, but it is not easy to compare. This is an opportunity for improvement, especially given the nature of the changing technology landscape.

    This is an addendum to the bench issue. I'd like to compare server processors too. It seems to me like in some niches we might start seeing server parts fill over the places where those highend desktop parts were. I already see this in AMD. Intel is on the cusp of this also. This is something to consider. I'd also like to see some more enterprise items covered in general. AMD is selling ARM servers already? Where have I been? And there are ARM based linuxes available.

    Thanks for the great work and timely info.
  • HisDivineOrder - Saturday, January 18, 2014 - link

    "The point I am making with this heart-warming/wrenching family story is that the Kaveri APU is probably the ideal fit for what he needs. Strap him up with an A8-7600 and away he goes. It will be faster than anything he has used before, it will play his games as well as that new HD 6750, and when my grandmother wants to surf the web or edit some older images, she will not have to wait around for them to happen. It should all come in with a budget they would like as well."

    OR you could buy him a cheapo dual-core CPU from Intel plus a used mid-range card from a year or two ago.

    Far better performance for only a bit more. There is an argument forthese APU's in gaming and it's for those who want to game with something like a Gigabyte BRIX-sized computer that trades performance for size.

    Performance per dollar does not favor the APU simply because you can get so much more performance ignoring these APU's altogether.
  • NinuGie - Saturday, January 18, 2014 - link

    such wow much fail. until APU comes in desktop format there will always be better alternatives. i want to see an APU compact format and similar to what they did on PS4. shared fast RAM .until then,they suck. i mean this is so bad implemented. and they advertise it for gamers lol. even if you CF the apu with a supprted gpu ,a HD 7770 is better so no thank you
  • arthur42 - Sunday, January 19, 2014 - link

    The A10-6700T is in good supply in Europe; I'm running one for months now.
  • aidnr - Monday, January 20, 2014 - link

    I'm pretty impressed with what they've done here, it looks like it is pretty evenly matched with Intel's offering - http://versus.com/en/amd-a10-7850k-vs-intel-core-i...

    Will be interesting to see how widely adopted Mantle is, seems pretty nice.
  • samal90 - Monday, January 20, 2014 - link

    Can someone explain to me how come AMD is able to make an incredible APU capable of running games at almost 60fps on the new consoles but can't make a desktop APU to do so? Why can't they use the same architecture? Maybe I'm missing something...but I'm just wondering.
  • meacupla - Wednesday, January 22, 2014 - link

    Because PS4/XB1 is not limited to using FM2+ socket, because they use a much slower CPU portion in PS4/XB1 and because of thermal limits.

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