AMD: R7xx Speculation
- Thread starter Unknown Soldier
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There are 3 possibilities:
1. 9800 GT aka GTS 260; 9800 GTX aka GTS 280.
2. 9800 GT aka GTS 240; 9800 GTX aka GTS 260; xxx aka GTS 280
3. no more 9800 GT; 9800 GTX aka GTS 260; xxx aka GTS 280
xxx = Better card than 9800 GTX.
However manufactured by 55 nm productive process.
IMHO
Another thought:
160x5 = 800
800x625 = 1 TFLOP
AND
160x3 = 480
480x1050 ~ 1 TFLOP
Even if everyone here is going for 480SPs, which seems to be more likely, im not quiet shure yet. Im not an GPU engineer and i dont know how easy u could change rv670, but im not convinced yet that it has to be 96v5 shaders.
160x5 = 800
800x625 = 1 TFLOP
AND
160x3 = 480
480x1050 ~ 1 TFLOP
Even if everyone here is going for 480SPs, which seems to be more likely, im not quiet shure yet. Im not an GPU engineer and i dont know how easy u could change rv670, but im not convinced yet that it has to be 96v5 shaders.
leoneazzurro
Regular
IIRC, a vec5 superscalar works better on vertex workloads and is not so much bigger than a vec 3 superscalar unit.
Sound_Card
Regular
I wonder if RV770 will have 6 SIMD arrays(two more four quad arrays) going to 6 RBE's to keep a nice and neat pattern eh? Or perhaps most likely they are going to stay at 4 RBE's and just let the shader export distibute accordingly. Or will they even stay at 4 SIMD arrays with just two more quads added to each array?
I thought R600 and RV670 no longer have four arrays of something. These chips have 64 shaders, but RV610 has 8 and RV630 has 24. That would mean there are 8 arrays of 8 units in R600/RV670, not 4 arrays of 16 units, if my reasoning is correct. But to answer your question, I think that with 6 RBE blocks it would be impossible to keep the memory bus width at 256 (or any other 2^n number) bits. The ratio between shaders and RBEs is not fixed, so they can stay at 4 RBE blocks.
IMHO Vertex processing power is rather abundant and overkill-esque in the current R6XX configs already.
160 v3 instead of 96 v5 should help in the bad/worst case utilization scenarios, but if ATI already went so far to do this the other issues would have been squished, squashed, and squoshed too.
err, no you're very wrong here... RV670 (and R60) certainly has 4 shader arrays with 16 5-wide units each. RV630 has 3 shader arrays with 8 5-wide units. RV610 has 2 arrays with 4 units each. Remember unlike G80/G9x array length is not fixed!
I don't know neither though if it will be 6 arrays with 16 units or 4 arrays with 24 units - if it's really going to have 32 tmus (well 16 would also be possible but in this case but I think everybody ruled that out...), it must be 6 arrays with 16 units, else if it's going to have 24 tmus, it must be 4 arrays of 24 units due to the way tmus are coupled to the shader arrays.
Again unlike G80/G9x, RBEs are not directly coupled to memory channels (R600 still only had 4 RBEs despite having 512bit bus), so it should be possible, though I think most consider it unlikely.
Yes, certainly.
Sound_Card
Regular
As pointed out already no. RV670 has four SIMD arrays of 16 5 wide shaders(4 quads).
I'm also under the impression that the RBE's are not tied into the MC's.
And w/ TUs u mean what? I only know TMUs.
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