AMD Kaveri Review: A8-7600 and A10-7850K Tested
by Ian Cutress & Rahul Garg on January 14, 2014 8:00 AM ESTKaveri: Aiming for 1080p30 and Compute
The numerical differences between Kaveri and Richland are easy enough to rattle off – later in the review we will be discussing these in depth – but at a high level AMD is aiming for a middle ground between the desktop model (CPU + discrete graphics) and Apple’s Mac Pro dream (offloading compute onto different discrete graphics cards) by doing the dream on a single processor. At AMD’s Kaveri tech day the following graph was thrown in front of journalists worldwide:
With Intel now on board, processor graphics is a big deal. You can argue whether or not AMD should continue to use the acronym APU instead of SoC, but the fact remains that it's tough to buy a CPU without an integrated GPU.
In the absence of vertical integration, software optimization always trails hardware availability. If you look at 2011 as the crossover year when APUs/SoCs took over the market, it's not much of a surprise that we haven't seen aggressive moves by software developers to truly leverage GPU compute. Part of the problem has been programming model, which AMD hopes to address with Kaveri and HSA. Kaveri enables a full heterogeneous unified memory architecture (hUMA), such that the integrated graphics topology can access the full breadth of memory that the CPU can, putting a 32GB enabled compute device into the hands of developers.
One of the complexities of compute is also time: getting the CPU and GPU to communicate to each other without HSA and hUMA requires an amount of overhead that is not trivial. For compute, this comes in the form of allowing the CPU and GPU to work on the same data set at the same time, effectively opening up all the compute to the same task without asynchronous calls to memory copies and expensive memory checks for coherency.
The issue AMD has with their HSA ecosystem is the need for developers to jump on board. The analogy oft cited is that on Day 1, iOS had very few apps, yet today has millions. Perhaps a small equivocation fallacy comes in here – Apple is able to manage their OS and system in its entirety, whereas AMD has to compete in the same space as non-HSA enabled products and lacks the control. Nevertheless, AMD is attempting to integrate programming tools for HSA (and OpenCL 2.0) as seamlessly as possible to all modern platforms via a HSA Instruction Layer (HSAIL). The goal is for programming languages like Java, C++ and C++ AMP, as well as common acceleration API libraries and toolkits to provide these features at little or no coding cost. This is something our resident compute guru Rahul will be looking at in further detail later on in the review.
On the gaming side, 30 FPS has been a goal for AMD’s integrated graphics solutions for a couple of generations now.
Arguably we could say that any game should be able to do 30 FPS if we turn down the settings far enough, but AMD has put at least one restriction on that: resolution. 1080p is a lofty goal to hold at 30 FPS with some of the more challenging titles of today. In our testing in this review, it was clear that users had a choice – start with a high resolution and turn the settings down, or keep the settings on medium-high and adjust the resolution. Games like BF4 and Crysis 3 are going to tax any graphics card, especially when additional DirectX 11 features come in to play (ambient occlusion, depth of field, global illumination, and bilateral filtering are some that AMD mention).
Facebook
Twitter
RSS
380 Comments
View All Comments
retrospooty - Tuesday, January 14, 2014 - link
"a low end cpu like the athlon X4 with a HD7750 will be considerably faster than any APU. So in this regard, I disagree with the conclusions that for low end gaming kaveri is the best solution."I get your point, but its not really a review issue , its a product issue. AMD certianly cant compete inthe CPU arena. They are good enough, but nowhere near Intel 2 generations ago (Sandy Bridge from 2011). They have a better integrated GPU, so in that sense its bte best integrated GPU, but as you mentioned, if you are into gaming, you can still get better performance on a budget by getting a budget add in card, so why bother with Kaveri?
Homeles - Tuesday, January 14, 2014 - link
"I get your point, but its not really a review issue , its a product issue."Well, the point of a review is to highlight whether or not a product is worth purchasing.
mikato - Wednesday, January 15, 2014 - link
I agree. He should have made analysis from the viewpoint of different computer purchasers. Just one paragraph would have worked, to fill in the blanks.. something like these -1. the gamer who will buy a pricier discrete GPU
2. the HTPC builder
3. the light gamer + office productivity home user
4. the purely office productivity type work person
just4U - Tuesday, January 14, 2014 - link
I can understand why he didn't use a 7750/70 with GDDR5 ... all sub $70 video cards I've seen come with ddr3. Your bucking up by spending that additional 30-60 bucks (sales not considered)Computer Bottleneck - Tuesday, January 14, 2014 - link
The R7 240 GDDR5 comes in at $49.99 AR---> http://www.newegg.com/Product/Product.aspx?Item=N8...So cheap Video cards can have GDDR5 at a low price point.
just4U - Tuesday, January 14, 2014 - link
That's a sale though.. it's a $90 card.. I mean sure if it becomes the new norm.. but that hasn't been the case for the past couple of years.ImSpartacus - Thursday, January 16, 2014 - link
Yeah, if you get aggressive with sales, you can get $70 7790s. That's a lot of GPU for not a lot of money.yankeeDDL - Tuesday, January 14, 2014 - link
Do you think that once HSA is supported in SW we can see some of the CPU gap reduced?I'd imagine that *if* some of the GPU power can be used to help on FP type of calculation, the boost could be noticeable. Thoughts?
thomascheng - Tuesday, January 14, 2014 - link
Yes, that is probably why the CPU floating point calculation isn't as strong, but we won't see that until developers use OpenCL and HSA. Most likely the big selling point in the immediate future (3 to 6 month) will be Mantle since it is already being implemented in games. HSA and OpenGL 2.0 are just starting to come out, so we will probably see more news on that 6 months from now with partial support in some application and full support after a year. If the APUs in the Playstation 4 and Xbox One are also HSA supported, we will see more games make use of it before general desktop applications.yankeeDDL - Tuesday, January 14, 2014 - link
Agreed. I do hope that the gaming consoles pave the way for more broad adoption of these new techniques. After all, gaming has been pushing most of the innovation for quite some time now.CPU improvement has been rather uneventful: I still use a PC with an Athlon II X2 @ 2.8GHz and with a decent graphic card is actually plenty good for most of the work. That's nearly a 5 year old CPU and I don't think there's a 2X improvement even going to a core i3. In any case, there have to be solution to improve IPC that go beyond some circuit optimization, and HSA seems promising. We'll all have to gain if it happens: it would be nice to have again some competition non the CPU side.