Author: Robert Hyatt
Date: 20:03:37 12/05/02
Go up one level in this thread
On December 05, 2002 at 20:40:00, Yen Art Tham wrote: >On December 05, 2002 at 18:09:06, Robert Hyatt wrote: > >>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. > > >That'll be great. Thanks. >BTW, how much does your new dual xeon cost? the box with one 36 gig ultra-320 scsi 15K rpm disk was about 4600 us dollars. It will end up with 8 of those drives in it total, once the others arrive... This is a server-type box with 8 hot-swap 1" scsi drive bays... dual power supplies, etc...
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