Author: Aaron Gordon
Date: 09:44:21 08/13/04
Go up one level in this thread
On August 13, 2004 at 11:55:12, Anthony Cozzie wrote: >On August 13, 2004 at 02:12:04, Aaron Gordon wrote: > >>All the bad press finally got him redo the review. I told'em a few cflags he >>could use to make performance better.. unfortunately he didn't do the PGO >>optimization. I think he thought because I said I used GCC 3.4.1 that it was >>only available in 3.4.1, who knows.. >> >>Anyway, looks like the 64bit stuff on the Nacona offers no performance benefit >>(only addressing). Would fit with the rumors I heard a few months back. We'll >>see I guess. Supposedly they just "got it working" for now and will fix the >>performance issue later. >> >>Anyone know any hard facts about the 64bit Xeon stuff? Broken? > >I thought Nocona was an implementation of of AMD64 ? > >anthony From what I hear it is, however supposedly it only has the addressing of a 64bit chip (ie. can use that much ram, can use 64bit integers/fp/etc), but cannot do them as fast as it is suppose to be. The way I heard it described was like it was using the 32bit registers to do all of the stuff.. similar to a regular P4 trying to do a __int64, long long, or double. I can't verify this, but from the results that Anandtech did it sure looks like the rumor may be true. The other part of the rumor was that Intel was going to fix it soon. I think this was a quick add-on after they saw x86-64 was the next big thing and didn't have time to rework the core to get it functioning 100%. I guess we'll see in the months ahead...
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.