.jayderyu said:
haxxiy said:
I would like to know how X360 CPU is even close to PS3 Cell.
Xenon's performance bare minimum is 19.2 GFlops (3 cores x 2 FP units per at 3.2GHz). Theoretical max is 115 GFlops.
CBE's performance bare minimum is 92.8 Gflops (7 SPEs with 4 FP units per, and one PPE with 1 FP unit per, all at 3.2GHz). Theoretical max is 204 GFlops.
Recent tests by IBM show that the SPEs can reach 98% of their theoretical peak performance using optimized parallel Matrix Multiplication.
204 * 98 = 199.92 GFlops
Conclusion: Cell is at least 73% more powerful than Xenon.
As I have posted in another thread:
Reality Synthesizer:
550 MHz
256 MB GGDR3 700 MHz
+300 million transistors
24 parallel pixel-shader ALU pipes
27 floating-point operations per pipeline, per cycle
8 parallel vertex pipelines
10 floating-point operations per pipeline, per cycle
27 * 24 * 550 = 356.4 GFlops
10 * 8 * 550 = 44 GFlops
PS3 total = 400.4 GFlops
Xenos:
500 MHz
Unified memory (10 MiB daughter DRAM embedded in 65nm process)
48-way parallel floating-point dynamically-scheduled shader pipelines
232 million transistors
Unified shading architecture (each pipeline is capable of running either pixel or vertex shaders)
10 floating-points per pipeline per cycle
10 * 48 * 500 = 240 GFlops
X360 total = 240 GFlops
Conclusion: RSX is at least 68% more powerful than Xenos.
But in orded to be fair, comparing only floating point abilities of a system is a one-dimensional and application-specific metric. Just pointing some errors out there.
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First I think it safe that you need the official IBM statement on that. It's fair enough since the OP did make his post with data. I do advocate proof :) when it comes to this kind of thing. You also need to dispute the OP OS requirements leaving evidence that applications have access to more power. The OP did give an analysys that the straight raw power the PS3 is more powerful, but he also goes on to use the OS consumption. So I am interested in your next figurative analysis so we can make a full comparison with the adjusted IBM changes with the proven Sony OS changes to take advantage and the OS consumption.
Someone mentioned Integer processing. Interger processing isn't used for 3d. Only Floating Points. Integers are use for game logic in these cases.
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Table 2 or table 13, IBM CBE page.
SPE max : 25.01
PS3 CBE: 7 SPE, 6 used by developers, 1 used by the OS.
25.01 * 6 = 150,06 GFlops.
PPE = roughly 2 SPE in terms of power.
150 + 50 = 200 GFlops max
Intersting enough? So, what about now advocating proof about the 'Xenon proven 115 GFlops'? ^^
