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30th June 2005 11:13 #1Registered User
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1st July 2005 09:45 #2Registered User
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Right now, from what weve heard, the real-world performance of the Xenon CPU is about twice that of the 733MHz processor in the first Xbox. Considering that this CPU is supposed to power the Xbox 360 for the next 4 - 5 years, its nothing short of disappointing. To put it in perspective, floating point multiplies are apparently 1/3 as fast on Xenon as on a Pentium 4.The Cell processor doesnt get off the hook just because it only uses a single one of these horribly slow cores; the SPE array ends up being fairly useless in the majority of situations, making it little more than a waste of die space.The Cell processor is no different; given that its PPE is identical to one of the PowerPC cores in Xenon, it must derive its floating point performance superiority from its array of SPEs. So what's the issue with 218 GFLOPs number (2 TFLOPs for the whole system)? Well, from what we've heard, game developers are finding that they can't use the SPEs for a lot of tasks. So in the end, it doesn't matter what peak theoretical performance of Cell's SPE array is, if those SPEs aren't being used all the time.
Don't stare directly at the flops, you may start believing that they matter.
Another way to look at this comparison of flops is to look at integer add latencies on the Pentium 4 vs. the Athlon 64. The Pentium 4 has two double pumped ALUs, each capable of performing two add operations per clock, that's a total of 4 add operations per clock; so we could say that a 3.8GHz Pentium 4 can perform 15.2 billion operations per second. The Athlon 64 has three ALUs each capable of executing an add every clock; so a 2.8GHz Athlon 64 can perform 8.4 billion operations per second. By this silly console marketing logic, the Pentium 4 would be almost twice as fast as the Athlon 64, and a multi-core Pentium 4 would be faster than a multi-core Athlon 64. Any AnandTech reader should know that's hardly the case. No code is composed entirely of add instructions, and even if it were, eventually the Pentium 4 and Athlon 64 will have to go out to main memory for data, and when they do, the Athlon 64 has a much lower latency access to memory than the P4. In the end, despite what these horribly concocted numbers may lead you to believe, they say absolutely nothing about performance. The exact same situation exists with the CPUs of the next-generation consoles; don't fall for it.
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1st July 2005 11:08 #3Registered User
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1st July 2005 11:14 #4Registered User
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Originally Posted by arstechnica
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1st July 2005 11:47 #5Registered User
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Originally Posted by barnie
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1st July 2005 12:44 #6
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1st July 2005 12:53 #7Registered User
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Originally Posted by lilos
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1st July 2005 12:21 #8, svetlyo
Originally Posted by chavv
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1st July 2005 12:32 #9Registered User
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1st July 2005 12:59 #10( ) , . (.. - )
Originally Posted by svetlyo
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