Author: Vincent Diepeveen
Date: 07:31:05 04/24/01
Go up one level in this thread
On April 24, 2001 at 10:05:26, Robert Hyatt wrote: >On April 24, 2001 at 08:37:04, Vincent Diepeveen wrote: > >>On April 24, 2001 at 03:33:29, Trefor Deane wrote: >> >>>Are all the best Chess Programs only written for the PC,Can anyone please >>>recommend any Chess Programs for Apples G4 processor? Here in the UK we don't >>>seem to have the same choice that you guys have. >>>Thanks >>> >>>Tref. >> >>Apple is everything but helpful. I emailed them last 2 weeks >>and they don't want to say a thing. I have no idea how slow diep would >>be on a G4, they only make PR for how fast their FPU (called velocity >>engine at the g4) is. >> >>My sister has a dual G4 at home, so i'll compile DIEP there one day. >>However for programmers G4 isn't interesting in advance as it >>runs at most at 733Mhz and dual at 533Mhz. Compare that to a dual 1Ghz intel >>and within a few months dual 1.5Ghz K7 !! > > >That doesn't say a thing. Compare a 600mhz 21264 to a 1.5ghz intel. The >21264 will blow the doors off the Intel processor in any benchmark. The >G* processors are very very good, even without outlandish clock rates. Does >it really matter if the cpu runs at 1.5 ghz if it can't get data to/from memory >that fast? Let's compare a few things and let us leave the 21264 outside the comparision. dual K7-1.33Ghz versus G4. 32 kb L1 cache for the G4 versus 128 for the K7 4 instructions a second for the G4 at most versus 3 for the K7 So most likely the g4 will have bigger branch misprediction penalty as they do more instructions a clock. For sure less fits in the L1 and L2 cache, though they have a L3 cache to prevent a major slowdown. So on paper the g4 can be at most 25% faster as K7, despite that it has smaller caches! Now a dual G4 is clocked at most at 533Mhz, and i cannot do a THING with those 128 bits registers for the velocity engine. Crafty is not a normal program as it can profit from 64 bits registers. Please compile it 32 bits at a 21264 and tell me how fast it is for it and also compile it 32 bits at a G4 and tell me how fast g4 is foryou. Most likely it's SLOWER as a K7 for crafty! When talking about diep it's very clear that 533Mhz + 25% is never going to beat something over 1 Ghz. >Bus speed is also important... Intel is lagging there. That's irrelevant when compared to the slow speed of the processors. Even if i lose 10% to possible bus speed, then still a 533Mhz dual is not going to beat a 1.33Ghz K7 dual or what i have now a 800Mhz PIII. The 21264 comes in a near to 900Mhz version also in a dual. Now if i add 25% to that, then it might get very close or even faster as a dual 800PIII, most likely way faster. But when compared to a dual 1.33Ghz K7 it will of course never beat it. Even the most optimistic approach of the 21264 it is 30% faster (bigger caches as K7 and G4). Now with a lucky Bus one might add another 10% and it gets close to a dual 1.33Ghz K7. It definitely beats a dual 1Ghz PIII. but let's get back to the G4. It runs at 533Mhz at most dual!!!!!!!!!! that's really nothing! You can make good processors but if you can't clock them high then it never is going to beat something over a Ghz! I didn't talk about P4 here as that's a loser in advance, even in 1.7Ghz flavour. Yet a 1.7Ghz P4 will of course also for me beat a 533Mhz G4. Best Regards, Vincent Best Regards, Vincent
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.