The PS3 makes up for it as they use all of those Cell processors basically as a GPU. But in terms of pure GPU Girth, the XBox360 was just straight up easier to use and more powerful.
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Basically... despite all the major press about the PS3 "supercomputer", XBox360 was a simpler, better designed gaming machine. In in this upcomming generation, PS4 out-xboxed the XBoxOne. The PS4 is a dead-simple straightforward architecture that simply throws more hardware at the problem. (while somehow being cheaper...)
A lot of that is a demonstration in why microbenchmarks are usually worthless for determining real world performance.
Xenos has a unified shader architecture while RSX does not. That means that during microbenchmarks, it can dedicate all of its shaders to that task, and put up relatively impressive numbers. In reality, that means that those shaders can't be used for anything else, meaning your real world performance will look nothing like the microbenchmark. AA performance is almost entirely due to the on-package EDRAM. While that was a smart design decision, it's not indicative of some huge overall power advantage.
Look, Microsoft made a number of very smart design choices with the 360 that have allowed developers to squeeze a lot out of the hardware, there's no doubting that. I think it's also fair to say that Xenos is a bit faster than the RSX -- as was the case with that generation of discrete GPUs from ATI and Nvidia -- but throwing around things like twice as powerful and "crushes" is getting into hyperbole territory if you're looking at actual performance from the hardware.
2x faster Triangle Setup rate, 4x faster Vertex Shader processing, 50% faster pixel shaders, 2x faster Anti-Aliasing...
The PS3 makes up for it as they use all of those Cell processors basically as a GPU. But in terms of pure GPU Girth, the XBox360 was just straight up easier to use and more powerful.
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Basically... despite all the major press about the PS3 "supercomputer", XBox360 was a simpler, better designed gaming machine. In in this upcomming generation, PS4 out-xboxed the XBoxOne. The PS4 is a dead-simple straightforward architecture that simply throws more hardware at the problem. (while somehow being cheaper...)