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Old 02-02-12, 11:23 PM   #249
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Join Date: Jul 2003
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Default Re: next gen kepler to support dx 11.1, also take a year to rollout all cards

Originally Posted by MUYA View Post
If kepler was indeed new architecture that was designed not to have a hot clock. If its die shrink of Fermi maybe hot clocks are still needed? I dunno man this is getting real silly at the moment in terms of rumors....

Given the size of the current Fermi GPU at 530mm2, a straight die shrink to 28nm without changing a thing on it would still make a chip that's 371mm^, basically as large as the Tahiti GPU on the HD7970 GPU's as it is, so you can imagine what adding twice as many shaders as listed on those charts, 64 Rop's and even more texture units, would do to the size of the GPU itself...Yup, it would be huge and hardly able to hit high clocks period.

As for the double clocked shaders, it's hard to say to be honest, and they might ditch them because even if adding more of them, they're still not able to hit the intended performance targets, or a fab process limitation of the 28nm process that won't allow to hit intended clock speeds if they're still double clocked, or simply needing to beef up the shaders to deliver more performance but having to sacrifice their double clocked nature in the process, perhaps to also make the overall architecture more power efficient....The reasons could be many.
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