Caporegime
- Joined
- 18 Oct 2002
- Posts
- 33,188
Much bigger tha 1920sp's would start to get big to the detriment of yields though so its unlikely.
Charlie has posted TWO rumours on Cayman so far, 4d MONTHS before anyone else posted slides to confirm this, he was the ONLY source on that, the only other thing he said which again no one else has come close to suggesting, is a just under 400mm2 core, meaning around 20% bigger than Cypress, and considering the new 4d shader group is bigger than 4 old shaders, but smaller than the whole 5d cluster it means shader for shader its actually slightly bigger(but then savings in core logic and seemingly less rops/other bits per shader, so probably evens out so a 1920 cypress/cayman wouldn't be noticeably different in size).
It would pretty much at a minimum be 10% more shaders if 1920 were only a 6950, which means you're now pushing up to 430mm2 and getting dangerously close to very expensive cores.
I would be pretty surprised if they went "that" big.
Also, I'll just mention again disabling parts of the core doesn't scale power down perfectly, its FAR better to have 2x top cores at say 750Mhz, than the same performance but 2x partially disabled cores at a higher clock speed. For any performance combination they could go for two fully enabled cores with lower clock speeds and lower voltage to get that clock speed will always be a better power option two cores with less shaders but higher clock speed and more voltage.
Hence the 4870x2, 5970, remember the 285gtx was a power whore yet the 295gtx had two "full" cores with lowered clock speeds and disabled part of the bus and reduced memory size slightly to reduce the power.
Theres almost no chance at all of the 6990 using anything but 6970 cores at the lowest voltage possible. The bandwidth numbers for the 6990 were also, underwhelming, I'd expect final 6970 numbers to be increased for bandwidth and to use higher voltage and higher speed memory while the 6990 will be underclocked.
Hopefully memory voltage will be adjustable, I mean remember end of the day the 5970 was released as an overclocking card from the get go, every review basically focused on how AMD meant the thing to be overclocked. 300W for the point, for real use you buy it and whack it WAY up in performance.
Charlie has posted TWO rumours on Cayman so far, 4d MONTHS before anyone else posted slides to confirm this, he was the ONLY source on that, the only other thing he said which again no one else has come close to suggesting, is a just under 400mm2 core, meaning around 20% bigger than Cypress, and considering the new 4d shader group is bigger than 4 old shaders, but smaller than the whole 5d cluster it means shader for shader its actually slightly bigger(but then savings in core logic and seemingly less rops/other bits per shader, so probably evens out so a 1920 cypress/cayman wouldn't be noticeably different in size).
It would pretty much at a minimum be 10% more shaders if 1920 were only a 6950, which means you're now pushing up to 430mm2 and getting dangerously close to very expensive cores.
I would be pretty surprised if they went "that" big.
Also, I'll just mention again disabling parts of the core doesn't scale power down perfectly, its FAR better to have 2x top cores at say 750Mhz, than the same performance but 2x partially disabled cores at a higher clock speed. For any performance combination they could go for two fully enabled cores with lower clock speeds and lower voltage to get that clock speed will always be a better power option two cores with less shaders but higher clock speed and more voltage.
Hence the 4870x2, 5970, remember the 285gtx was a power whore yet the 295gtx had two "full" cores with lowered clock speeds and disabled part of the bus and reduced memory size slightly to reduce the power.
Theres almost no chance at all of the 6990 using anything but 6970 cores at the lowest voltage possible. The bandwidth numbers for the 6990 were also, underwhelming, I'd expect final 6970 numbers to be increased for bandwidth and to use higher voltage and higher speed memory while the 6990 will be underclocked.
Hopefully memory voltage will be adjustable, I mean remember end of the day the 5970 was released as an overclocking card from the get go, every review basically focused on how AMD meant the thing to be overclocked. 300W for the point, for real use you buy it and whack it WAY up in performance.