AidenShaw said:
Note that my post said "what are they saying" about the MacIntel. The "snot" remark is just one of many comments that have been posted about the good performance of the MacIntel developer systems.
Use the "find text" feature of your browser and search for "snot" on that page (
http://www.neowin.net/forum/lofiversion/index.php/t330170.html), you should see:
Actually, I do know how to search, I was just looking for something a bit more objective than that quote.
AidenShaw said:
And the first sentence of that final link says "benchmark reports of programs running under Rosetta"....
Xbench was translated, but the OS was not emulated. This is not like VirtualPC, and translated apps are expected to 80% as fast as native apps (with the exception of those with Altivec or G5-specific code).
AidenShaw said:
Xbench was emulated/translated....and still outperformed the dual 2.5 in graphics.
Since the graphics results are so markedly different from the other results, I suspect that this demonstrates how poorly Xbench is optimized for G5/Mac graphics compared to P4/Windows graphics. I seem to remember reading (sorry, no time to find a quote today) that optimizations were done to the P4 to ensure that it would do well on Xbench, whether or not they resulted in any real-world improvements...
AidenShaw said:
Until then, however, the following is interesting:
SPEC Scores
Code:
Model Speed CPU Type SPECint SPECfp
---------- -------- -------- ------- ------
IBM JS20 2.2 GHz PPC970 986 1178
IBM HS20 3.6 GHz Xeon 1684 1769
Is it fair to say that the Xeon "kicks the snot" out of the PPC970 here?
Wouldn't it be reasonable to believe that on applications that don't use MP well, the Xeon would "kick the snot" out of a dual 2.7?
Sure, if, as you say, an app doesn't use MP well (although even these apps are often accelerated with DP due to off-loading of OS-related tasks onto the 2nd processor), and if you are comparing the mid-range G5 with the top-of-the-line Xeon (why don't you compare it with a 3.06 GHz Celeron while you're at it?). I have little interest in benchmarks that require that one of the processors on a DP machine be disabled and that the remaining processor be underclocked (since they don't make the 2.2 anymore); these changes result in poor correlation between benchmark results and real world performance. These benchmarks essentially demonstrate that a machine barely faster than the low-end SP configuration of the PowerMac (which most MR members seem to feel is substantially inferior to the other configurations) is out-performed by the top-end Xeon. How surprising!
In reality, if the changeover to Intel happened today, Macs would probably not be any faster than they are now. Of course, next year's MacIntels be faster than today's Macs, but next year's Windows boxes will be faster than today's Windows boxes, as well. The switch, as Jobs explained it, was not because of performance, but because of heat production.
IMO, there were 2 reasons for the switch:
1. IBM could not or would not deliver the required PPC 970s in sufficient quantity in a reasonable period of time.
2. The PPC 970s were designed too efficiently for their own good. Although they did not produce excessive heat compared to P4s, they had too little surface area from which to dissipate the heat, hence liquid cooling.