By: Adrian (a.delete@this.acm.org), August 30, 2022 10:23 am
Room: Moderated Discussions
me (me.delete@this.me.com) on August 30, 2022 8:17 am wrote:
> > The Ryzen 9 7950X is expected to have a cost of around $0.50 per Gflop/s, which approximately
> > matches the lowest computation cost that has ever been provided by GPUs.
> >
> > Also the expected value for Gflop/s per watt is about the same as it was
> > for the best GPUs before their transition to FinFET CMOS processes.
> >
>
> If I did the math right the 7950X @ 5 Ghz all core would be 1.2 TF for fp64.
> Even with it being gimped, the Navi 21 GPUs do about that. MI250X does 47.
It is true that a Radeon RX 6900 XT has a similar FP64 throughput as expected for 7950X.
However, it costs $800 and it consumes 300 W, so it is both more expensive and more power hungry.
To be an attractive alternative to a CPU, a GPU needs at least a double performance, both per dollar and per watt.
Of course I would like a MI250X, but that is Unobtainium.
It remains to be seen which will be the specifications for the soon to be launched NVIDIA RTX 4000 series and AMD RX 7000 series, but I doubt that any of those can offer competitive performance for FP64 computations.
> > The Ryzen 9 7950X is expected to have a cost of around $0.50 per Gflop/s, which approximately
> > matches the lowest computation cost that has ever been provided by GPUs.
> >
> > Also the expected value for Gflop/s per watt is about the same as it was
> > for the best GPUs before their transition to FinFET CMOS processes.
> >
>
> If I did the math right the 7950X @ 5 Ghz all core would be 1.2 TF for fp64.
> Even with it being gimped, the Navi 21 GPUs do about that. MI250X does 47.
It is true that a Radeon RX 6900 XT has a similar FP64 throughput as expected for 7950X.
However, it costs $800 and it consumes 300 W, so it is both more expensive and more power hungry.
To be an attractive alternative to a CPU, a GPU needs at least a double performance, both per dollar and per watt.
Of course I would like a MI250X, but that is Unobtainium.
It remains to be seen which will be the specifications for the soon to be launched NVIDIA RTX 4000 series and AMD RX 7000 series, but I doubt that any of those can offer competitive performance for FP64 computations.