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ethomaz on 15 June 2011
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zarx said:

 I think your power estimations are kinda off...

  Fab (nm) Memory (MiB) Core clock (MHz) Memory clock(MHz) Config core Pixel (GP/s) Texture (GT/s) Bandwidth (GB/s) RAM type
Radeon HD 4890 55[43] 1024
2048		 850 9752[44] 800:40:16 13.6 34 124.8 GDDR52


  Fab (nm) Core clock (MHz) Core config Pixel (GP/s) Texture (GT/s) Memory (MiB) Memory clock(MHz) Bandwidth (GB/s) RAM type
Xenos (Xbox 360)[98] 90
65
45		 500 48:16:82 4 8 512 (shared)
10 eDRAM		 700
500		 22.4
32 (GPU – Logic)
256 (Logic – Memory)		 GDDR3
eDRAM

Why? The 48 shaders cores of Xenos is like 200 or more shaders cores of HD 4890... so at least 4x more power... of course theare are others variables like clock, memory, TMUs and ROPs... but in the worst case the HD 4890 is 4x more powerful than Xenos (maybe the best case it is 8x more powerful).