AMD A10-7800 Review: Testing the A10 65W Kaveri

Kaveri was launched as a processor line, on desktop, back in January 2014. At the time we were given information on three of the APUs, the A10-7850K, A10-7700K and A8-7600, and reviewed two of them, including the A8-7600 65W processor. However, at the time, AMD stated that the model we tested was to come out at a later date: that date is today, in a trio of 65W parts. The A10-7800 we are testing today is the locked down version of the A10-7850K, with a slight speed reduction to hit 65W as well as a configurable TDP to 45W.

The Drive to Lower TDP

Previous AMD APU releases have often come with a flurry of processors up and down the price range. Back with the Llano cores and the FM1 platform, two processors were released in the first month followed by six the next and six more by the end of the 2011. With Trinity, it was a similar story: four processors in the first two months, then ten more by the end of the 2012. Richland had eight processors at launch, then other 8 by the end of 2013 and three more for 2014. This is what makes Kaveri a little different: two 95W processors at launch at the start of 2014, and three 65W for July 2014, six months later. Not only is this a large time gap between expanding the processor range, but also a small number of SKUs. That being said, CPU-World lists another 65W APU for release after this trio, and then no more Kaveri until the end of the year when four ‘PRO’ (aka ‘Business Class’) models enter the arena.

Having your mainstream platform headed up by two 95W APUs of the latest generation architecture for so long does nothing for the low power crowd, and AMD’s official reasons for delaying the launch of their 65W parts is due to the lower power message AMD wants to convey, especially in terms of configurable TDP.

Each of the new 65W parts released today has two modes of operation. Out of the box, they will run in 65W mode, using a restricted range of processor frequency in the faster end of operation but with ultimately less efficiency. With an adjustment in the BIOS, they will operate at 45W, which will adjust the base frequency of the processor, relying more on turbo for single threaded workloads. AMD’s numbers above quote a 6-7% dip in performance for a 31% drop in TDP.

If we consider Intel's strategy and AMD's older strategy into the mix, CPU manufacturers would release two processors, one at 45W and one at 65W, in order to offer this difference. That way each die could be tuned for frequency or voltage, as well as processor graphics residency. For whatever reason, AMD decided to consolidate the differing power options, perhaps in order to reduce the number of SKUs on the shelves and make the customer’s choice an easier one. 

But therein lies an issue. The number of users prepared to go into the BIOS and adjust the frequency is slim at best, which leads on to system integrators to implement this change in the units they sell. But which system integrators are going to sell products to their customers that do not perform at the maximum performance?  It only works when the APU is for a specific design, like an off-the-shelf HTPC or digital signage. The other implementation could be that in order to make the product stack work, it helps to have a few SKUs such that everyone pays more even if they use less – having 45W APUs in the stack might drive sales away from the higher performing models.

The New APUs

AMD’s nomenclature on Compute Cores sums up the number of CPU threads and the number of Compute Units in the processor graphics to give a total number. The previous APUs released were rated at 12 compute cores (A10-7850K) and 10 compute cores (A10-7700K), and the new APUs released today have 12 (A10-7800), 10 (A8-7600) and 6 (A6-7400).

AMD Kaveri APUs
  A10-7850K A10-7800 A10-7700K A8-7600 A6-7400K
TDP 95W 65W 95W 65W 65W
Compute Cores 4 CPU +
8 GPU
4 CPU +
8 GPU
4 CPU +
6 GPU
4 CPU +
6 GPU
2 CPU +
4 GPU
Modules / Threads 2 / 4 2 / 4 2 / 4 2 / 4 1 / 2
Base Frequency 3700 3500 3400 3100 3500
Turbo Frequency 4000 3900 3800 3800 3900
L1 Cache 192 KB I$
64 KB D$
192 KB I$
64 KB D$
192 KB I$
64 KB D$
192 KB I$
64 KB D$
96 KB I$
32 KB D$
L2 Cache 4 MB 4 MB 4 MB 4 MB 1 MB
Graphics R7 R7 R7 R7 R5
GPU Cores 512 512 384 384 256
GPU Clock 720 720 720 720 756
Max DDR3 2133 2133 2133 2133 1866
SSRP $173 $155 $155 $105 $77

One might imagine that AMD would at some point offer APUs at the same frequency with the same name but without the ‘K’ monitor for overclocking, but the distinct numbering difference is occompanied by the respective frequency adjustments. In this case, the A10-7800 is 200 MHz less on the base frequency than the A10-7850K but +100 MHz over the A10-7700K.

AMD confirmed with us after the initial press call the number of streaming processors in the processor graphics, as well as their frequencies. Based on these numbers, the two 78xx APUs have the full complement at 720 MHz, with the 77xx and 76xx reducing down to 6 compute cores. The A6-7400K is interesting in that the frequency is increased to 756 MHz, perhaps indicating that removing one of the CPU modules and half the IGP gives them extra room to play with for frequency. The A6 model does have another metric to set it apart – official memory support is down to DDR3-1866. This differentiation was also present on the Richland 65W A6 and Trinity 65W A6 processors as well.

AMD 65W Bulldozer Based APUs
  Trinity Richland Kaveri
Model A6-
5400K
A8-
5500
A10-
5700
A8-
6500
A10-
6700
A10-
7800
A8-
7600
A6-
7400K
Microarchitecture Piledriver Steamroller
Socket FM2 FM2+
Modules /
Threads
1 / 2 2 / 4 1 / 2
CPU Base Freq 3600 3200 3400 3500 3700 3500 3100 3500
Max Turbo 3800 3700 4000 4100 4300 3900 3800 3900
TDP 65W
L1 C$ 64/32 128 KB C$
64 KB D$
192 KB C$
64 KB D$
96/32
L2 C$ 1 MB 2 x 2 MB 1 MB
Graphics HD
7540D
HD
7560D
HD
7660D
HD
8570D
HD
8670D
R7 R7 R5
GPU Cores 192 256 384 256 384 512 384 256
GPU Clock 760 760 760 800 844 720 720 756
Max DDR3 1866 1866 1866 1866 1866 2133 2133 1866
Current Price $60 $99 N/A $119 N/A $155 $105 $77

Kaveri APU Features

In our initial Kaveri coverage and review of the A10-7850K, AMD spent a large amount of time with the press going over their new features for the Kaveri line of APUs. At the time, Mantle support was the big headline, along with HSA (Heterogeneuous System Architecture) that afforded several compute features which could accelerate certain workloads.

Rahul’s deep dive on HSA is well worth a read, beyond my simple coverage here. The main principles allow the processor threads and integrated graphics to both access the same areas of DRAM (known as a Unified Memory Architecture) without expensive memory copies and maintaining the data structure. 

With heterogeneous queuing, both the CPU threads and integrated graphics can generate extra work for the other, allowing for dynamic asynchronous compute.

These features, along with working with software developers to optimize their workflow, allow AMD to quote improvements. In our PR pack with this launch AMD is quoting up to 69% faster upscaling in Adobe Photoshop CC for A10 vs. i5, up to 7x faster in LibreOffice for A8 vs. i3, and up to 65% faster JPEG decoding time on A6 vs. Pentium.

For gaming, alongside Mantle support due to the use of GCN, AMD has also implemented the TrueAudio DSP on the Kaveri APU line. Rather than use CPU power or shaders for complex directional audio affects, the DSP is designed to speed these up and reduce stress on other components of the system for better frame rates. The two games being quoted for TrueAudio are Thief and Lichdom Battlemage.

The other feature using the GCN cores is HEVC Compute support with PowerDVD 14, using OpenCL to speed up decoding for high definition content. With a soon-to-be released update, AMD Fluid Motion Video should also be supported.

Launch Deal

With the launch of the 65W APUs, AMD is going to run a promotion for any user purchasing an A10 between August and October – purchase an A10 APU and have a choice of a free game between Thief, Sniper Elite III and Murdered Soul Suspect.

Test Setup

As these APUs are still part of the Kaveri line, they should work with any FM2+ motherboard, although depending on the motherboard manufacturer it may require a BIOS update. We suggest that you contact the retailer to ensure that the motherboard BIOS is up to date and compatible with the new APU.

Test Setup
Processor AMD A10-7800
2 Modules, 4 Threads
Motherboards MSI A88X-G45 Gaming
Cooling Corsair H80i
Thermalright TRUE Copper
Power Supply OCZ 1250W Gold ZX Series
Memory 2 x Corsair Vengeance Pro 2x8 GB DDR3-2400 10-12-12 Kit
Memory Settings 2133 8-9-9
Video Cards MSI GTX 770 Lightning 2GB (1150/1202 Boost)
Video Drivers Catalyst 14.3
NVIDIA Drivers 337
Hard Drive OCZ Vertex 3 256GB
Optical Drive LG GH22NS50
Case Open Test Bed
Operating System Windows 7 64-bit SP1
USB 2/3 Testing OCZ Vertex 3 240GB with SATA->USB Adaptor
WiFi Testing D-Link DIR-865L 802.11ac Dual Band Router

 

CPU Benchmarks
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  • eanazag - Thursday, July 31, 2014 - link

    A real budget Desktop PC based on AMD for gaming is going to be the A8-7600. The performance numbers are so close and the processor is also ~$100. The pricing on the 7850K doesn't make sense. The 7800 begins to get reasonable. The A88X chipset is a smidge better than the H87 from a feature standpoint. I think the 7850K should be around $145 and the 7800 around $125. Yes, AMD would take a hit on margin, but I think the volume could be better. Reply
  • tomsworkshop - Thursday, July 31, 2014 - link

    the 65W TDP A10-7800 & A8-7600 are good enough for day to day computing + gaming,
    the intel-i5 may give u 2.5% more performance for the extra 25% cost for day to day computing but not for gaming, u still need to spend more for the dGPU if u wanna games, but that means the cost, TDP, heat & noise and your power bill will be increasing as well.
    Reply
  • Andrew Lin - Tuesday, August 05, 2014 - link

    again, i don't actually see what you're trying to say here. the system power usage of almost any intel i3 or i5 are a good amount lower than almost anything AMD has, and that's with far higher performance. the same argument about the dGPU can be made about AMD, but with worth propositions because then you've actually bought an APU for absolutely no reason. Reply
  • Andrew Lin - Tuesday, August 05, 2014 - link

    that should say "worse propositions" Reply
  • tomsworkshop - Thursday, August 14, 2014 - link

    again, we use both Intel CPU (without discrete GPU) and AMD APU here, we see no big different on applications which need a lot computing power, maybe a few second faster on the Intel system, but we see a big different for application that need a lot of graphic power, AMD APU shine on that area. the average joe that buy an system for day to day computing like online, office document, video playback, online games don't even need to computing power from the i5/i7, the core 2 duo or even Pentium 4 can be satisfy for them, you've actually bought an i5/i7 for absolutely no reason. Reply
  • tomsworkshop - Thursday, August 14, 2014 - link

    because you are too stupid to understand and see the different or you just a plain blind Intel fanboy sheep, we all know that Intel CPU alone had little bit lower TDP than AMD offering, but the integratedGPU on the Intel CPU sucks big times, anyone in the right mind who build Intel system for gaming will sure need a discrete graphic card by geforce or by radeon, than it totally makes the Intel systems TDP far higher than current AMD 45W/65W APU, we already see that the 45W/65W A8-7600 can handle many modern games on medium setting, that pretty amazing for building a cybercafe gaming rigs, the owner with 50-100 units gaming rig build with AMD 45/W/65W APU will make profit and save money from cut down a lot power cost, the single chip AMD APU will also produce less heat than the intel cpu + discrete gpu, less heat in the cybercafe means less air condition needed = less power = cost saving, the single chip AMD APU will also produce less noise than the intel cpu + discrete gpu, less noise in the cybercafe lead to better environment quality for the cybercafe, that's make the big different which the kids like you can even see. Reply
  • max1001 - Thursday, July 31, 2014 - link

    Why in the world would someone buy an APU to get dGPU? Reply
  • tomsworkshop - Thursday, July 31, 2014 - link

    lower power consumption, less noise and heat, small form factor, console size gaming rig and htpc Reply
  • Jon Tseng - Friday, August 01, 2014 - link

    Catch 22:
    1) AMD kicks ass if you want to game on integrated graphics only.
    2) If care about gaming you'd never use integrated graphics only.
    Therefore AMD's kickass integrated performance is only available people who don't care about gaming and don't need AMD's kickass integrated performance.
    Reply
  • mrcaffeinex - Friday, August 01, 2014 - link

    I own an A10-7850K and I game on the iGPU exclusively. I primarily play older titles, but the performance is there for what I'm playing: Skyrim, Fallout: New Vegas, Rage, even a little Battlefield 3 from time to time...

    1080p on high settings for older titles is not only playable on the iGPU, but gets 60 FPS on some titles. What more do you need for HTPC/light gaming duty?

    I picked up the APU/Motherboard as a combo at MicroCenter for about $150 after tax. It fits in my slim HTPC case, runs cool (doesn't need the fan ramped up high enough to make it audible) and does what I need it to do.

    The problem is that so many people become so focused on one single performance aspect that they overlook the myriad use-cases for these APUs, of which small-form-factor HTPCs are one. The A10-7800 is running the same iGPU with slightly lower-clocked CPU cores for less money, with a lower TDP, making them viable for even more consumers that do not have the need of a dGPU, but still want to do some casual gaming, which I bet encompasses a lot more people than the typically enthusiast crowd that frequents a site like Anandtech...
    Reply

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