Pardon my commenting on a discussion that's a little over my head, but if I understand the architechtural differences between Opteron and Pentium/Xeon, wouldn't the latency difference between them be attributed at least in part to the on-die memory controller?
On 8/14/06, Stuart Midgley <[EMAIL PROTECTED]> wrote:
actually, latency determines bandwidth more than memory speed... see my rant(?) from a little over a year ago http://www.beowulf.org/archive/2005-July/013294.html prefetch etc. help, but the limiting factor is still latency. Hence the opterons have significantly higher real memory bandwidth (their latency is about 1/3 that of xeons/p4's etc). If you look at the ia64's then they have even high latency again, but they can have a huge number of outstanding loads (from memory its >80), so their effective bandwidth is high. Stu.
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