Author: Keith Evans
Date: 21:19:54 03/05/03
Go up one level in this thread
On March 05, 2003 at 22:41:02, Robert Hyatt wrote: >On March 05, 2003 at 20:10:56, Keith Evans wrote: > >>On March 05, 2003 at 15:09:38, Robert Hyatt wrote: >> >>>On March 05, 2003 at 14:46:18, Keith Evans wrote: >>> >>>>On March 05, 2003 at 11:34:39, Robert Hyatt wrote: >>>> >>>>>On March 05, 2003 at 10:21:32, Vincent Diepeveen wrote: >>>>> >>>>>Your data is simply wrong. The xeon core has _not_ changed from 2.8ghz to 3.06 >>>>>ghz, >>>>>and I have no idea why you want to supply your "disinformation" that it has. >>>>> >>>>>We have four of these on the way (dual 3.06 dell 650s) for faculty. They have >>>>>shipped >>>>>(2/28) so they should be here any time. I'll run the tests and post the results >>>>>to further >>>>>debunk this "myth" that 3.06's are different... >>>>> >>>>> >>>> >>>>What is the difference between a 3.06 GHz P4 and a 3.06 GHz Xeon? >>>> >>>>Thanks, >>>>Keith >>> >>> >>>Not a whole lot, other than the xeons have the necessary hardware for multiple >>>processor >>>configurations. IE the ability for each to invalidate pieces of the cache based >>>on activity on >>>the other processor. >> >>At Dell you can buy dual processor P4 systems. How are they handling the >>multiprocessor configurations compared to a Xeon? Is there a performance >>hit? Are they really Xeons and not P4s? > >What machine? We have bought several 650's and they are xeon-based. My >2600 server platform is also xeon-based. > >Tell me what you are looking at and I'll poke around Dell... Now that I'm looking again I can't find them. Which means that it must have been a figment of my imagination, and you're right about the multiple processor stuff. I'm actually quite glad to be wrong about that because otherwise I would be very confused... Sorry about that. > > >> >>>Also there are xeons and xeon-MP versions. The MP >>>versions are >>>supposedly the only ones capable of running in 4-way and up boxes. What the >>>differences are >>>I really have not taken the time to discover... >>> >>>Oh yes. There is one significant difference. Price. :) >> >>Has anyone run crafty on an MP system? Any idea how a 2 GHz MP would compare to >>a 3 GHz Xeon? > > >I have run it on a 4-way 2ghz box. It is faster than my dual 2.8, but then >it is _way_ more expensive as well as the 2ghz xeons (MP certified) only come >in 2mb L2 cache versions and each CPU is selling for $4K or so. Makes the >machine _very_ expensive. I might be interested in such a box for running ASIC simulations so cost wouldn't be an issue. I think that a dual MP box could be had for under $15k at Dell which isn't bad compared to the cost of the software that I would be running on it. The large cache might be a huge win - the 512k Xeon cache definitely helped. Regards, Keith
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