By: Exophase (exophase.delete@this.gmail.com), December 12, 2012 11:46 pm
Room: Moderated Discussions
Mark Roulo (nothanks.delete@this.xxx.com) on December 12, 2012 3:53 pm wrote:
> Maybe this is new only to me, but the iGPU clock speed seems to have
> almost doubled in Haswell compared to Ivy Bridge: 1250 vs. 650.
>
> *IF* Intel has also increased the iGPU in other ways (widening it, whatever ...) *AND*
> can solve the bandwidth starvation issue (Crystalwell maybe??), then it looks like
> the iGPU could easily double or more the performance compared to Ivy Bridge.
>
> More pressure on AMD and the low end discrete cards ...
>
If the leaked numbers are correct it's possible that they refer to turbo frequency, not base frequency. The column title "dynamic frequency" does imply this. In this case it's only a little bit higher than the highest bin on IB (1.15GHz), and lower that the highest bin on SB (1.35Hz). Combined with a higher EU count (20 vs 16) that gives a peak 35.9% improvement, given no other adjustments. In practice it'd tend to be less if the TMU capabilities haven't changed and due to main memory bandwidth staying the same.
Crystalwell is alleged to only be paired with GT3 parts, which is supposed to only appear on lower TDP mobile platforms. It's also rumored that the top clocks will be lower, which makes sense because as it stands the 17W IBs of today can't very easily hit their top GPU turbo speeds at all.
> Maybe this is new only to me, but the iGPU clock speed seems to have
> almost doubled in Haswell compared to Ivy Bridge: 1250 vs. 650.
>
> *IF* Intel has also increased the iGPU in other ways (widening it, whatever ...) *AND*
> can solve the bandwidth starvation issue (Crystalwell maybe??), then it looks like
> the iGPU could easily double or more the performance compared to Ivy Bridge.
>
> More pressure on AMD and the low end discrete cards ...
>
If the leaked numbers are correct it's possible that they refer to turbo frequency, not base frequency. The column title "dynamic frequency" does imply this. In this case it's only a little bit higher than the highest bin on IB (1.15GHz), and lower that the highest bin on SB (1.35Hz). Combined with a higher EU count (20 vs 16) that gives a peak 35.9% improvement, given no other adjustments. In practice it'd tend to be less if the TMU capabilities haven't changed and due to main memory bandwidth staying the same.
Crystalwell is alleged to only be paired with GT3 parts, which is supposed to only appear on lower TDP mobile platforms. It's also rumored that the top clocks will be lower, which makes sense because as it stands the 17W IBs of today can't very easily hit their top GPU turbo speeds at all.
