Author: Matt Taylor
Date: 10:07:20 12/31/02
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On December 31, 2002 at 08:36:14, Frank Phillips wrote: >On December 30, 2002 at 23:38:08, Matt Taylor wrote: > >>On December 30, 2002 at 22:13:43, Robert Hyatt wrote: >> >>>On December 30, 2002 at 19:39:23, Frank Koenig wrote: >>> >>>>Two questions. >>>> >>>>One) Will Intel's HT technology be able to help chess programs above and beyond >>>>just allowing one CPU to appear as two? >>>> >>>>Second) If you are running XP, will HT require XP Pro instead of XP Home to take >>>>advantage of it? >>>> >>>>Thanks, >>>> >>>>Frank >>> >>> >>>I can't answer the last question.... As to the first, you can expect a parallel >>>searcher to run 20-30% faster using two "virtual cpus" than using one real cpu. >>> >>>YMMV depending on the program however, as my numbers are numbers produced only >>>by Crafty on a 2.8ghz xeon... >> >>I can't really answer the last question either, but I will speculate anyway >>(because it's fun). I checked the license agreement for Windows XP Professional, >>and it only says that it is licensed for up to 2 processors. It makes no mention >>of physical/logical processors, so presumably it will run either with SMP or HT. > >A licence restricts the configuration of the machine you can run the software on >that you bought - incredible. Sort've -- you can get a quad-Xeon system and install Windows XP Professional on it, but two of your CPUs won't be powered up. I guess they figure that, if you're running more than two CPUs, you're probably running a server. Not very common to get more than two CPUs in a workstation or home computer. It carries a hefty pricetag unless you count HT. :-) >>I thought Windows XP Home supported 2 processors as well, but I only have 2 >>boxes with Windows (including my work PC) and both run XP Professional. >> >>-Matt
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