Author: Robert Hyatt
Date: 15:09:06 12/05/02
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On December 05, 2002 at 15:19:43, Yen Art Tham wrote: >On December 05, 2002 at 10:22:31, Robert Hyatt wrote: > >>On December 05, 2002 at 09:41:41, Brian Katz wrote: >> >>>Could someone please explain the difference between the AMD Athlon >>>2600+ processor and let's say multi processor 2 x 1000. >>>Even if we use Pentium as examples such as 1 x 2.0 gig vs 2 x 1.0 gig. Would >>>they be the same? Someone had told me that a 1x2000 is faster than a 2x1000. >>> >>>Please explain the difference. >>> >>>Thank you >>> >>>Brian Katz >> >> >>First, 2 x 1000 is < 1 x 2800. :) >> >>But more importantly, a dual doesn't search twice as fast as a single. >>Depending on who >>you believe, the dual AMD will run somewhere between 1.4 and 1.7 times as fast >>as a single >>cpu. So that dual 1000 now looks like a single 1400 to 1700 machine. >> >>But you aren't home yet. A parallel search is going to be somewhere around 1.7X >>efficient >>rather than 2X, due to extra nodes searched, so that dual 1000 will be slower. >>Let's solve >>this completely: >> >>2 * 1000 * 1.7/2.0 * 1.7/2.0 (giving AMD the benefit of assuming the dual is >>1.7x faster >>overall which I have not seen from numbers posted here) and you get: >> >>1445mhz. Take the single cpu you mentioned. :) > > >If your calculations are right, it doesn't look very good for >the dual. Only a 45% (mhz) improvement! >Doesn't look like it's worth it to own a dual. Depends, of course. I can post some dual comparison numbers for Crafty tonight if you want, to see what a dual xeon does. Of course it will be using hyper-threading, but it will at least show the dual xeon vs single xeon number in a crude way.
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