Author: Robert Hyatt
Date: 18:29:34 01/15/03
Go up one level in this thread
On January 15, 2003 at 19:04:36, Aaron Gordon wrote: >On January 15, 2003 at 18:14:50, Jorge Pichard wrote: > >>On January 15, 2003 at 17:43:47, Jorge Pichard wrote: >> >>>On January 15, 2003 at 15:21:00, Robert Hyatt wrote: >>> >>>>On January 15, 2003 at 12:56:07, pavel wrote: >>>> >>>>>Robert, >>>>> I must have missed this in your earlier discussion, but how much >>>>>speedup are you getting on this Xeon? Did you replace your older ones with the >>>>>new ones already? >>>>> >>>>>Cheers, >>>>>pavs >>>> >>>> >>>>I simply replaced my quad 700 with a dual 2.8. It is somewhere around 2x >>>>faster, >>>>overall... >>> >>> >>Therefore, the 8x 1000 Mhz used vs Kramnik is roughly almost the same speed as >>the newer dual Xeon 2.8 Ghz. >> >>PS: I'm NOT comparing these two systems Mhz Per Mhz since 8x1000 = 8000 Ghz, >>whereas 2 x 2.8 = 5.6 Ghz, but the performance difference should be roughly >>equal using the Newer Dual Xeon 2.8/533. >> >>Pichard > > >I highly doubt that. You seem to be forgetting that the P3's are faster MHz for >MHz than the Pentium 4 chips. It roughly takes a P4-1.6GHz to equal one P3-1GHz. That isn't true in my case. My quad xeon 700 was a PIII-based xeon box. My dual 2.8 is almost exactly twice as fast, which is what the clocks say should happen. > >Also, about the "400/533mhz" bus business, it's not actually 400mhz or 533mhz. >It's just quad pumped (four data transfers per cycle). Thus a "400MHz" p4 bus is >actually 100MHz and a "533" is 133. Same goes for DDR (double pumped, two >transfers per cycle). I prefer DDR over RDRAM. DDR is much more efficient >(actually does what it's rated for). The PC1066 RDRAM only pulls around 3.2gb/s >actual but 240MHz(480) DDR hits 3.7gb/s easily (on an Nforce2 board). ;) If you think about it, does it matter? 1 transfer 400M times a second, or 4 transfers 100M times a second? It is simply semantics, not practical speed. BTW my xeon box (2.8 x 2) is DDR ram, not rambus... I'm not a fan of rambus at all except for certain kinds of streaming memory applications...
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