By: David Kanter (dkanter.delete@this.realworldtech.com), August 13, 2012 9:50 am
Room: Moderated Discussions
> > Speaking of
> > power, SP vs. DP which you think consumes
> more power?
> > Could Kepler turbo on
> > DP?
> >
> > K10 is
> 745MHz/112.5W, x2880/1536=211W, x1.5T/(2*960*745M)=221W
> > I guess
> >
> that big-K at 4.5T/1.5T is plausible at 1.8T/300W.
>
> Interesting notion
> considering that they now seem to be doing the DP operations on separate units.
> Perhaps they would able to do these operations at a higher clock?
They are using the same datapath for GK110. IIRC, each SM has 3 sets of 16 FPUs. Two of those sets can be ganged together to execute 16 DP instructions.
I'm not sure about GK104 though.
> When
> measuring the actual power consumption of the GT240 we found that purely compute
> bound applications didn't manage to max out the power consumption (50-60 % of
> max power while reaching near peak GFLOP/s numbers). It was rather the bandwidth
> bound applications that seemed to put more strain on the memory controllers that
> were consuming the most power.
The memory controller consumes a ton of power and is definitely required to max the chip out.
DK
> > power, SP vs. DP which you think consumes
> more power?
> > Could Kepler turbo on
> > DP?
> >
> > K10 is
> 745MHz/112.5W, x2880/1536=211W, x1.5T/(2*960*745M)=221W
> > I guess
> >
> that big-K at 4.5T/1.5T is plausible at 1.8T/300W.
>
> Interesting notion
> considering that they now seem to be doing the DP operations on separate units.
> Perhaps they would able to do these operations at a higher clock?
They are using the same datapath for GK110. IIRC, each SM has 3 sets of 16 FPUs. Two of those sets can be ganged together to execute 16 DP instructions.
I'm not sure about GK104 though.
> When
> measuring the actual power consumption of the GT240 we found that purely compute
> bound applications didn't manage to max out the power consumption (50-60 % of
> max power while reaching near peak GFLOP/s numbers). It was rather the bandwidth
> bound applications that seemed to put more strain on the memory controllers that
> were consuming the most power.
The memory controller consumes a ton of power and is definitely required to max the chip out.
DK
