Author: Aaron Gordon
Date: 01:28:02 09/28/02
Go up one level in this thread
On September 27, 2002 at 23:42:03, Robert Hyatt wrote: >I didn't run the SMP tests for AMD, I don't have a one here and have no plans >to get one. I posted a chart of data others provided. I don't even remember >which position we used now. All that was significant was that all the speedup >numbers (raw nps, not parallel search times) were in the 1.4-1.5 range with >AMD, and 1.8 and above for the intel boxes... > >I personally believe it highlights a memory bottleneck... I don't think it's fair for you to find the slowest possible binary for the AMD and some IntelC5 binary and then claim that the speedup is slow. I don't think it's fair either if someone takes a slow binary for a P4 and compares it to a fast binary for an AMD cpu. You seem to conveniently forget the benchmarks I've done and other people here have done. Take a look at my latest graph of crafty results: http://speedycpu.dyndns.org/crafty/craftybench4.jpg Note: the P4 2.76GHz is an overclocked 1.8A northwood at 153.5fsb(614MHz RDRAM). Now, the SMP binaries I have are able to produce a 1.7x speedup in the benchmark. You claim the P4's get 1.8x, thats fine. Take the P4-2.76's result (1,120,011 nps) and multiply it by 1.8. You get 2,016,019.8 nps. Not too shabby, right? Well.. take the 1.86Ghz XP and multiply it's nps by 1.7 and you get 2,035,330.1. Still faster. Now, if you're saying, "Well yadda yadda is overclocked and etc etc". Yeah, and even faster things will be released here shortly. I can guarantee the P4-2.76 w/ 614MHz RDRAM would be as fast or a hair faster than a standard P4-2.8. The AthlonXP at 1.86 would be more around a 2300+ if such a thing existed. Moving on to the future.. P4-3GHz will soon be released as well as the 2800+ (being announced on October 1st). Lets do some rough guessing. If a P4 gets 1,120,011 nps @ 2.76 it should get about 1,217,403 nps at 3GHz and thats probably still having the RDRAM clocked to insanity. Take the 2.52GHz AthlonXP @ 1,578,197. At 2133MHz (AthlonXP 2600+) it should do about 1,335,831 nps. Again do 1,335,831 * 1.7 and 1,217,403 * 1.8 and you get: 2,270,912.7 nps for the dual XP 2600+ (2.13ghz) 2,191,325.4 nps for the dual P4-3GHz. Since Crafty is pretty linear you know these numbers are very close to the actual results. So far from what I've seen Pentium4's need an entire GHz more and twice the L2 cache just to come close. This is what I call a $500 keychain.
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