Author: Andreas Guettinger
Date: 09:41:42 11/03/05
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On November 03, 2005 at 12:12:41, Hristo wrote: >On November 03, 2005 at 03:12:39, Andreas Guettinger wrote: > >>On November 02, 2005 at 21:42:18, Hristo wrote: >> >>>On November 02, 2005 at 16:19:03, John Dillard wrote: >>> >>>>On November 02, 2005 at 15:34:30, Joshua Shriver wrote: >>>> >>>>>http://www.apple.com/powermac/ >>>>> >>>>>nice :) would make a good quad system. >>>>> >>>>>-Josh >>>> >>>> >>>>They're making a quad system. There's not other system on the market today, >>>>super computer or otherwise, that can process as many gigaflops of info as the >>>>dual core G5. I just wonder if any of the chess programs will benefit from this >>>>power? >>> >>>John, >>>I love Apple computers. In fact I'm writing this on my favorite PB 17" (OS-X >>>10.4.3). The other fact is that at work I use Opterons (three different >>>systemsin my office, all of them dual CPU) and those systems are able to match >>>or destroy (in some cases) the newer Macs (which we also have at work). >>>The only time a Mac wins (against Intel ot AMD) is when you can fit your problem >>>solution into Altivec and then spend some time optimizing it, which we have done >>>in a few cases in the domain of signal analysis. Outside of the Altivec-unit the >>>Macs are not going to win against AMD. >>>Memory access latency is the killer for many apps, not the memory access >>>throughput. In this sense most chess programs are limited by random access >>>latencies and not be sheer throughput (as it is needed in video or signal >>>processing). The dual-core G5s are not going to win the contest so easily >>>against AMD in particular. (In fact I would pay extra to get OS-X run on an AMD >>>processor) >>> >>>Anyway, >>>enjoy your Mac for what it is, the best computer experience you can have today, >>>and not for what it isn't the best chess playing computer in the world. If >>>someone spent the time to translate (port) their chess algorithms to Altivec (if >>>this is even possible) then your assumption _might_ have some merit. Until then, >>>enjoy your computer and what you can do with it. :-) >>> >>>Regards, >>>Hristo >> >>Maybe the faster DDR2 533 memory of the new dual cores G5 system reduces the >>memory access latency, who knows. > >Actually, I think that this faster memory is needed because there are now 4 CPUs >poking at it. So in order to keep the performance on per CPU basis the same as >before you would certainly need faster RAM:-) > >Regards, >Hristo > >> >>- Andy No. Both the Dual core systems and the Dual Dual core system use now DDR2 RAM via a new 128-bit memory controller, and have 1MB processor cache instead of 512kb. They are quite faster than previous models in benchmarks measuring memory access. regards Andy
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