Author: Tom Kerrigan
Date: 10:55:01 08/12/98
Go up one level in this thread
On August 12, 1998 at 10:44:40, fca wrote: >You wrote: >"Aside from software differences, the Pentium MMX/200 has a 66MHz L2 cache >(possibly smaller than 512k) whereas the Pentium II/300 has a 512k 150MHz L2 >cache. If a program really bangs on the L2 cache, it will go much faster on the >Pentium II." >But since the core (P2/300 vs P200MMX) is so much faster, the extra/faster cache >(even if accessed a lot) simply serves to alleviate what the faster core would >*otherwise* have made into a bottleneck. L2-hit rates etc suggest in itself >this would not be able to increase the speed ratio above that the cores deliver. Sort of. Notice that the 200/66 core clock speed/L2 cache speed ratio is much less than the 300/150 ratio, so if L2 cache is a bottleneck on the Pentium MMX/200, then it's less of a bottleneck on the Pentium II/300. >So, I am still surprised at the 2.5x reported. Aren't you? Not really. Consider this: Pentium MMX/200 = 1 Pentium MMX/300 = 1.5 (assume linear scaling) Pentium MMX/300 * 1.66 = 2.5 (66% improvement from P5 -> P6 core) So it's not out of the question. -Tom
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.