It can be important for GPGPU, but it can also be handy for passing commands to the GPU for regular graphics loads with less overhead.The "coherent 30GB/s Read and write" can be related to GPGPU?
The link itself is nothing new to APUs, which have always had a full-width non-coherent bus for the GPU to use all possible external bandwidth, and a more narrow coherent bus.
It doesn't need to be as wide because we can see that the GPU would have no trouble overwhelming the cores with a fraction of its non-coherent bandwidth demands.
It can be seen that the coherent path is sufficient to allow the GPU to read from one CPU cluster and the media/HDD blocks at full speed.
Why not? GCN is a vast improvement over the prior GPUs, and it's narrowed the gap in ISA features and programming model as compared to SIMD CPU instructions that the room for improvement is modest.Perhaps this is a silly question. Quick preface: Something doesn't wash here. Just a gut feeling from myself. Hard to explain. I just don't quite buy the assumptions that are being passed around to fill in the missing parts/ lack of detail in the VGleaks docs. Specifically I just don't buy that it's a fairly straightforward mod of a 7xxx.
Half of the Orbis-only or Durango-only features the rumor mill has gushed about are actually standard GCN features both are likely to have.
It's going to depend on the workload. The big consumer of bandwidth is obviously the GPU side, and the GPU is the unit that is most tightly paired to the ESRAM.Assuming that the 32mb of ESRAM is correct, how would anyone here change the GPU to take better advantage of that? MS seems to have spent a fair amount on that addition and the comments here seem to state it is not enough to make up for a lack main RAM bandwidth.
Other ancilliary benefits are that moving some of the most onerous rendering traffic to the ESRAM are that the Jaguar modules can benefit from a DDR3 memory pool that operates at a smaller granularity than GDDR5, and it seems pretty likely that the system memory controller won't have to struggle as much in juggling graphics and CPU access patterns.