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Blue3 on 02 June 2007
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lol the xbot driven memory fud. From ps3forums, GarnetandBlack post. "Xbox 360: GDDR3: 512 megs GDDR3/ 522 Megs total memory = .981 (rounded for simplicity - I'll call this the memory ratio, again, for simplicity). .981 memory ratio X 22.8 GB/s memory bandwidth = 22.37 GB/s EDRAM: 10 megs EDRAM/ 522 Megs total memory = .019 memory ratio. .019 memory ratio X 32 GB/s bandwidth to GPU = .61 GB/s Total proportional bandwidth: 22.37 + .61 = 22.98 GB/ s proportional bandwidth. PS3: GDDR3: 256 megs GDDR3/ 512 megs total memory = .5 memory ratio .5 memory ratio X 20.8 GB/s bandwidth = 10.4 GB/s XDR: 256 megs XDR/ 512 megs total memory = .5 memory ratio .5 memory ratio X 26.8 GB/s bandwidth = 13.4 GB/s Total proportional bandwidth: 10.4 + 13.4 = 23.8 GB/s proportional bandwidth. Now, the reason I did the calculations like that is because not only must you take into account the bandwidth, but you also must take into account the amount of memory that bandwidth is taking advantage of. Obviously, that 10 megs of EDRAM is not going to contribute to the overall bandwidth as much as the full GDDR3 ram will, especially with the bandwidth between itself and the GPU being reduced to 32 GB/s. In fact, looking at those numbers, effective proportional bandwidth is actually higher in the PS3 than it is in the Xbox, and that's not even taking the FSB into account. With the PS3 possessing a front side bus significantly faster than that of the 360 (by a factor of over 2), these numbers would be even more skewed in favor of the PS3. Take a look: PS3 proportional bandwidth and FSB total: 23.8 GB/s proportional memory bandwidth + 50 GB/s FSB = 73.8 GB/s total bandwidth. Xbox 360 proportional bandwidth and FSB total: 22.98 GB/s proportional memory bandwidth + 21.6 GB/s FSB = 44.58 GB/s total bandwidth. Things are really starting to swing in favor of the PS3 now. So, please, stop with all the FUD about memory bandwidth being low and the amount of ram being low. Bandwidth is almost frighteningly higher in the PS3, and while the Xbox 360 does have 10 more megs of EDRAM, that EDRAM is only used in a very specific way and has a much lower external (IE: to GPU) bandwidth than the internal number that everyone has been throwing around."