Originally Posted by DuckieHo
What 28nm GPUs? Last we heard, AMD was having yield issues with the HD 7xxx. We know that TSMC had bad yield issues with 40nm (see Fermi GF100). The 32nm node was so bad that TSMC dropped it.
The firts yield of TSMC 40nm-based Evergreen series was a turd, but I think they never made it to retail. The subsequent ones? I wouldn't call them exactly bad
As for 32nm, imagine if it was bad that AMD made the HD6 series upon 40nm process
Also, the GF 28nm and TSMC 28nm processes are different. Just because they are the same node/half-node, it does not mean they are interchangeable or even equivalent.
As for the 28nm... I messed it up with the 40nm node, my apologies there. Which makes me wonder which kind of silicon did nVidia choose amongst TSMC's offerings for the GF100 cores that they were so freaking hot, while AMD's chips weren't nowhere as hot nor power hungry. Sure we can't compare the HD5870 to a GTX480 in terms of performance (gaming/folding-wise), but we can compare it to a GTX470, which was WAY hotter and used a noticeable higher chunk of power.