wined3d/directx.c: Corrected Nvidia 8400 and 8500 reporting

[Seth Shelnutt]

Roderick,

You are right in that cuda is allowed on all GPU with 256mb of memory or
more, the problem is that the 8300 doesn't support cuda. The 8300m does, but
having the 84/8500 report as an 8300 means that if a program,
folding at homein this case, checks the gpu reported against a list of
cuda supported
devices, then it will fail. Weither it is because of the video memory
reporting or simply the string "Nvidia Geforce 8300 GS" I am not sure.

Separating the 85/8400 into it's own id is valid and easy enough to do. I
had tied them to the 8600GT because I thought it was simpler and created
less overhead for just two GPU's that probably don't represent a large
population. I think the 8400 should be tied to the 8500 or on it's own. If
you put the 8400 back with the 8300 then someone might run into the same
issue we are having now.


Thanks,

Seth Shelnutt

On Mon, Jul 12, 2010 at 2:51 PM, Roderick Colenbrander <
thunderbird2k at gmail.com> wrote:

> Hi Seth,
>
> It is not a good idea to advertise a 8400 and a 8500 as a 8600GT. All
> Geforce8 GPUs have the same features (except, some have different
> purevideo capabilities). As mentioned before even CUDA is allowed on
> all GPUs but only if they have 256MB or more.
>
> Likely the app you are using either disallows this GPU based on the
> wrong number of video memory Wine reports or it just disallows poor
> GPUs because it is not worth the effort to use them for CUDA
> computations because they don't have enough computation power.
>
> The Geforce 8600GT is (depending on the configuration) upto 4x faster
> (if you just look at shaders + clock speeds), so it is really not a
> good idea to mark the 8400/8500 as a 8600GT. This could really cause
> issues for games which use the PCI id to select a performance profile
> at startup.
>
> It would be better to add a separate 8500GT entry with 256MB. I'm not
> sure if we want to merge it with the 8400 though since the 8500 has
> 256-1024 (depending on the model) and the 8400 has 128-512MB. A lot of
> modern games like to have around 256MB. I guess it is best to keep the
> 8400 tied to the 8300.
>
> Roderick
>
> On Sun, Jul 11, 2010 at 7:04 PM, Seth Shelnutt <shelnutt2 at gmail.com>
> wrote:
> > Moves the Nvidia Geforce 8400 and 8500 to be reported as 8600GT as
> they have
> > feature parity. This is needed for CUDA applications to support these two
> > cards. They are currently reported as an 8300 which is not CUDA capable.
> >
> > Thanks,
> >
> > Seth Shelnutt
> >
> >
> >
> >
>
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