[Beowulf] El Reg: AMD reveals potent parallel processing breakthrough

Geoffrey Jacobs gdjacobs at gmail.com
Fri May 3 10:29:29 PDT 2013

On 05/02/2013 07:41 PM, Vincent Diepeveen wrote:
> Also utter useless it is, as the GPU has what is it 200GB/s bandwidth,
> going back to 6GB/s cache coherent gpu/cpu (just taking a number i've  
> seen more there get claimed
> that the bandwidth was in OpenCL) you lose roughly factor 30+ so  
> using such features is total nuts.

The vector unit (formerly the GPU) would still have the local caches,
no? Also, the APUs these would be replacing already have physically
unified access to the DDR3 memory pool, so there's no change in
effective bandwidth. Some APUs would come with a GDDR5 memory pool, so
memory bandwidth would be upgraded for the CPU.

The big change is that the pools are not separately allocated.

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