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Old 06-23-10, 09:00 AM   #1
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Post 'GPUs Are Only Up To 14 Times Faster than CPUs' says Intel

It's a rare day in the world of technology when a company you compete with stands up at an important conference and declares that your technology is *only* up to 14 times faster than theirs. In fact in all the 26 years I've been in this industry, I can't recall another time I've seen a company promote competitive benchmarks that are an order of magnitude slower.The landmark event took place a few hours ago at the International Symposium on Computer Architecture (ISCA) in Saint-Malo, France, interestingly enough, the same event where our Chief Scientist Bill Dally is receiving the prestigious 2010 Eckert-Mauchly Award for his pioneering work in architecture for parallel computing.

At this event, Intel presented a technical paper where they showed that application kernels run up to 14 times faster on a NVIDIA GeForce GTX 280 as compared with an Intel Core i7 960. Many of you will know, this is our previous generation GPU, and we believe the codes that were run on the GTX 280 were run right out-of-the-box, without any optimization. In fact, it's actually unclear from the technical paper what codes were run and how they were compared between the GPU and CPU. It wouldn't be the first time the industry has seen Intel using these types of claims with benchmarks.

The paper is called 'Debunking the 100x GPU vs CPU Myth' and it is indeed true that not *all* applications can see this kind of speed up, some just have to make do with an order of magnitude performance increase. But, 100X speed ups, and beyond, have been seen by hundreds of developers. Below are just a few examples that can be found on CUDA Zone, of other developers that have achieved speed ups of more than 100x in their applications.


Speed Up



General Hospital



University of Rochester



University of Amsterdam



Harvard University



University of Pennsylvania



Nanyang Tech, Singapore



University of Illinois



Boise State



Florida Atlantic University



Cambridge University



The real myth here is that multi-core CPUs are easy for any developer to use and see performance improvements. Undergraduate students learning parallel programming at M.I.T. disputed this when they looked at the performance increase they could get from different processor types and compared this with the amount of time they needed to spend in re-writing their code. According to them, for the same investment of time as coding for a CPU, they could get more than 35x the performance from a GPU. Despite substantial investments in parallel computing tools and libraries, efficient multi-core optimization remains in the realm of experts like those Intel recruited for its analysis. In contrast, the CUDA parallel computing architecture from NVIDIA is a little over 3 years old and already hundreds of consumer, professional and scientific applications are seeing speedups ranging from 10 to 100x using NVIDIA GPUs.

At the end of the day, the key thing that matters is what the industry experts and the development community are saying and, overwhelmingly, these developers are voting by porting their applications to GPUs.

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Old 06-23-10, 12:41 PM   #2
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Default Re: 'GPUs Are Only Up To 14 Times Faster than CPUs' says Intel

But only in certain applications. It's not disputed that GPUs are way faster than CPUs for brute force, parallelizable FP number crunching tasks. It's just everything else that's the issue :P
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