AMD: R9xx Speculation

naked 6970 graphics cards

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and ati have their own CSAA now, how many AA modes does that make..:oops:

Not as many as you think.
CSAA is a mixture of AA q0,q2&q4, the AA factor denotes coverage sample not the underlying MSAA mode, eg. 16xCSAA = 4xMSAA(q4)
EQAA is simply MSAA set to q=2.




All in all, AMD traded 16xCSAA for 2xEQAA which I think is marginally better, since 16xCSAA is literally no better than 8xCSAA, while 2x EQAA might prove to be useful when you can't afford 4x MSAA.
 
Not as many as you think.
CSAA is a mixture of AA q0,q2&q4, the AA factor denotes coverage sample not the underlying MSAA mode, eg. 16xCSAA = 4xMSAA(q4)
EQAA is simply MSAA set to q=2.




All in all, AMD traded 16xCSAA for 2xEQAA which I think is marginally better, since 16xCSAA is literally no better than 8xCSAA, while 2x EQAA might prove to be useful when you can't afford 4x MSAA.

2x EQAA = 2 color samples + 4 coverage samples =/= 16x CSAA = 4 color samples + 16 coverage samples, The 4MSAA is a much better AA mode for a 2GB card compare to 2xEQAA.
 
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That bodes well for Antilles / 6990.

Also: more than 200% for Lost Planet 2? Isn't that a bit....unlikely?

I remember, that Eric Demers once explained, that some caches are effectively doubled in CF, so in some rare cases performance can be a bit more than double. Anyway, I have no idea if this is the case...
 
Now it is becoming obvious that HD 6970 will be about 5-10% faster than GTX 480/570 , which puts it about 10% slower than GTX 580 (@1920x1200 ,4XAA) , this percentage will most likely shrink when 8X AA is used .

Still , we don't know about HD 6970 performance @2500x1600 resolution , the performance gap may actually change (shrink or increase) , I am hoping the increased frame buffer and memory bandwidth will be put to more use there , shrinking the gap even more .
 
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