Understanding why Xbox One doesn't need GDDR5 RAM

[disolitude]

HoloDust said:

disolitude said:

Your whole post falls appart when you add memory bus bandwidth.

7770/7790 has 128 bit bus...X1 has 256. This + SRAM embed is why Xbox 1 GPU will beat both AMD GPUs in performance  despite using DDR3 memory.

Uhm, no, not exactly - 7770 for sure, but though XOne's GPU (most likely) is based on same architecture as 7790 (which is not exactly the same as 7770), it has 128 shaders and 8 TMUs less, and it's clocked 20% lower, so I'm not so sure it can actually reach that level of performance. (same way I'm not quite so sure PS4's can reach exactly 7870 level, specially in games that are not compute heavy, thus not using all those additional compute enhancements to their fullest)

Right. I meant to say it will beat both memory bandwidth wise.