Author: Drexel,Michael
Date: 13:30:15 06/21/04
Go up one level in this thread
On June 21, 2004 at 12:51:52, Robert Hyatt wrote: >On June 21, 2004 at 09:15:59, Joachim Rang wrote: > >>On June 21, 2004 at 07:19:34, Drexel,Michael wrote: >> >>>On June 21, 2004 at 06:43:00, Joachim Rang wrote: >>> >>>>On June 21, 2004 at 06:14:58, Uri Blass wrote: >>>> >>>>>On June 21, 2004 at 05:51:40, Joachim Rang wrote: >>>>> >>>>>>On June 21, 2004 at 05:24:33, Uri Blass wrote: >>>>>> >>>>>>>I talk with a person and he tells me that Xeon2 is new technology and it is >>>>>>>better than opteron but it simply does not fit the price that I agree to pay for >>>>>>>it. >>>>>>> >>>>>>>He tells me that there are graphs that tell that Xeon2 is better. >>>>>>>When I tell him that people in this forum told me that pentium4 is relatively >>>>>>>bad he tells me that he does not trust them(note that he does not deal with >>>>>>>chess programs). >>>>>>> >>>>>> >>>>>>that's the point. Xeons are fine for certain applications and in generally I >>>>>>would say not worse than Opterons (but not better neither and much more >>>>>>expansive). >>>>>> >>>>>>For certain applications Xeons will outperform Opterons significantly and for >>>>>>others (such as chess programs) Opterons will outperform Xeons significantly. >>>>>>That is what all people in that board are telling you, so no need to ask other >>>>>>people who know nothing about chess performance. >>>>>> >>>>>> >>>>>>>He also claims that the Athlon64 is the same quality as the pentium4 that I can >>>>>>>get. >>>>>>>He agrees that the opteron is better than normal pentium4 that I can get. >>>>>>> >>>>>> >>>>>>this is all wrong. You can't no more make such general statements, since the >>>>>>performance for different purposes very widely. In general the P4 has also its >>>>>>merits and performs in some multimedia applciation very well, but for chess... >>>>>> >>>>>>>I am interested to know if there is some graph that shows that the opteron and >>>>>>>even the athlon64 is better than the xeon2. >>>>>>> >>>>>> >>>>>>look at the benchmarks given in this board and here: >>>>>> >>>>>>http://www.beepworld.de/members39/computerschach2/chessmarks.htm >>>>> >>>>>As far as I can see the leader is xeon and not athlon and the xeon is more than >>>>>twice faster in nps than second place so the reason is not having 2 processors >>>>>against one. >>>> >>>> >>>>This is misleading: the 1st entry is with two processors and HT enabled so >>>>apparently using 4 processors. Fritz than pushes the nps in the sky but that >>>>does not mean that it reaches greater depth (probably the contrary is true). >>>> >>>>DualXeon 3,565 2953 kn/s Jens H. (Deep Fritz8, 2 CPU) >>>> >>>>The "realistic" value is the 4th one: >>>> >>>>DualXeon 3,565 1326 kn/s Jens H. (Fritz8; 1 CPU) >>>> >>>>And that is an overclocked Xeon, so a standard Xeon @ 3.2 GHz would give 1190 >>>>knps. Compare that to 1405 with AMD 64 @ 2.2 GHz! >>> >>>I don't think you get 1405 kn/s on a "normal" A3400+. >>>There is something wrong. >>>Two others reported ~1330 kn/s for AMD 64 @ 2.2 Ghz. >>> >>>Michael >> >> >>Perhaps they were unlucky? Other Mobo? Better RAM? I mean 5% difference is >>normal if RAM and Mobo differ. >> >>regards Joachim > > >I find the above numbers interesting. Here is a single-cpu Opteron 248 run >(2.2ghz) on the DTS paper positions. These logs are available on my ftp box... > >total positions searched.......... 24 >number right...................... 24 >number wrong...................... 0 >percentage right.................. 100 >percentage wrong.................. 0 >total nodes searched.............. 15728711815 >average search depth.............. 14.1 >nodes per second.................. 2184528 > >Crafty averages about 1/1000th the Opteron clock rate for NPS. IE 2.2ghz >produces 2.2M nodes per second. Either somehow I have gotten way faster than >Fritz, which seems unlikely, or the 64 bit opteron likes Crafty much better than >a 32 bit application... Crafty is faster than Fritz on 32 bit. For example: [D] 1r5r/3b1pk1/p2p1np1/p1qPp3/2N1PbP1/2P2PN1/1PB1Q1K1/R3R3 b - - 0 1 Crafty 19.12 (Dann Corbit) : 1243 kN/s Fritz 8.026 : 1035 kN/s Fritz 5.32 : 1976 kN/s Athlon XP 2.2Ghz,64 MB hash after 30 sec search. Michael
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