A Thursday 10 September 2009 10:58:13 Rohit Garg escrigué: > > Where are you getting this info from? IMO the technology of memory in > > graphics boards cannot be so different than in commercial motherboards. > > It could be a *bit* faster (at the expenses of packing less of it), but > > I'd say not as much as 4x faster (100 GB/s vs 25 GB/s of Intel i7 in > > sequential access), as you are suggesting. Maybe this is GPU cache > > bandwidth? > > This is publicly documented. You can start off by looking at the > wikipedia stuff. > > For reference, > > gtx280-->141GBps-->has 1GB > ati4870-->115GBps-->has 1GB > ati5870-->153GBps (launches sept 22, 2009)-->2GB models will be there too > > Next gen nv gpu's will *assuredly* have bandwidth in excess of 200 GBps. > > This is *off chip memory bandwidth* from graphics memory (aka video > ram). GPU have (very small) caches but they don't reduce memory > latency.
That's nice to see. I think I'll change my mind if someone could perform a vector-vector multiplication (a operation that is typically memory-bounded) in double precision up to 5x times faster on a gtx280 nv card than in a Intel's i7 CPU. -- Francesc Alted
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