Author: Aaron Gordon
Date: 17:40:57 11/10/05
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On November 10, 2005 at 00:28:24, Robert Hyatt wrote: >>hypertransport isn't the bottleneck at all as that delivers hands down 14.4GB/s >>a channel. > >There is more to this than "bandwidth". There is "latency" and there are >"conflicts" I don't know too much about the technical workings of new bus system AMD uses on the Athlon 64/Opteron type systems. Hopefully you could clear something up for me, I would appreciate it. I tested my Athlon 64 3700+ (2.2GHz, single cpu, single core) running at standard 200MHz bus with my HT multiplier at the normal 5 (5x200=1000MHz HT). I ran Crafty 19.15 64bit and got 2321134 nodes/second. I then set the HT multiplier down to 1x, resulting in an HT bus of 200MHz (5 times slower). I retested Crafty and got the exact same NPS as before. If a drastic reduction of the HT bus speed results in zero nps loss, my initial guess is that it would have almost no effect on Crafty whether the dual core (or cpu) setup has one or two HT links. If this is not the case and Crafty does run slower, why exactly does this happen?
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