is F@H single or double precision?

[alpha754293]

is F@H single or double precision?

[jaak ennuste]

I have a wild guess -- single

Jaak

[^w^ing]

I think all the fah cores are single precision, except for the double gromacs cores (79,7b,7c), those are double precision.

[toTOW]

Here is a list of all cores that have ever been used in FAH with a brief description : http://fahwiki.net/index.php/Cores

[metal03326]

I guess the GPU cores are single, because they run on HD 2x00, which do not have double precision.

[John Naylor]

All cores are single precision except the three DGromacs cores which are double precision, as said by ^w^ing.

[^w^ing]

All cores are single precision except the three DGromacs cores which are double precision, as said by ^w^ing.

woohoo \o/

[7im]

I guess the GPU cores are single, because they run on HD 2x00, which do not have double precision.

There's someone who know's GPUs. Here's another bit of trivia for you to tuck away...

It's all currently single precision. All 800 on the 48XX SPs can support single precision floating point, leading to a 2.5X increase in peak performance. Double precision on the 48XX is also 2.5X the performance of the 38XX.

With a lot of effort, one can rewrite code that depends on double precision to run in single. It's rare that the whole code requires double -- usually there's just a few precision sensitive parts. By treating these parts carefully (e.g. reordering the numerics to avoid things like adding big numbers to small numbers, etc.) single precision can always work, but with a lot of effort in some cases.

We've already done that effort in GPU1, so the GPU2 code benefits from this today.

[alpha754293]

Good to know. Thanks guys.

[ColonelCain]

Good to know. Thanks guys.

Indeed. Quite.