Author: Robert Hyatt
Date: 20:10:55 01/12/04
Go up one level in this thread
On January 12, 2004 at 19:40:25, scott farrell wrote: >On January 12, 2004 at 09:21:06, martin fierz wrote: > >>i'm on the lookout for an AMD64 dropin for one of my older computers, mainboard, >>RAM and CPU. it's not too expensive it seems (about 900 swiss francs which is >>around 700$). >> >>currently i have the following choice: >> >>- 3000+: 2GHz, 512KB cache >>- 3200+: 2GHz, 1MB cache >>- 3400+: 2.2GHz, 1MB cache >> >>of course they get more expensive as the xxxx+ number goes up. does anybody have >>an idea what is more important for a typical chess program: having an additional >>512K L2 cache, or having those extra 0.2GHz? my instinct is to go for the >>cheapest version, but since the 3200+ is only about 80$ more than the 3000+, i'd >>like to know whether it might be worth the extra money (the 80$ more are about >>12% more in total price, so if the system delivers 12% more performance it would >>be even...) >> >>cheers >> martin > >depends on your engine etc, but from what I have seen the size of the cache has >a dramatic effect, whilst raw Mhz has little effect, I would go with the first >chip with the extra cache, and make sure your program doesnt 'dirty' the cache >with too many random memory requests, make more of them serial. > >Scott I have run some xeon-based tests in the past with 512kb, 1024kb and 2048kb L2 caches, and I didn't see much difference with Crafty overall. IE it did run somewhat faster, but not in line with the cost. IE at that point in time, the 512K 550mhz xeon cost over $1000 per CPU, 1024K ran that to over $2000 per cpu, and the 2048k xeon was over $5000. The performance certainly didn't double as the price did. I am not sure it made even a 25% overall difference...
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