Anyone use FRAPS?

[_dobbo_]

I've just installed FRAPS to try to get an idea of what sort of frame rate I'm getting, and what difference having dual graphics cards makes.

Running one card, and starting GTR, in a race of 31 cars I'm averaging about 60fps.

I then enabled SLI, reboot, start GTR again, and get an average of about 60fps...

Anyone else got an SLI system to check this? I wonder if fraps can't handle dual cards?

[FourWheelDrift]

I have FRAPs but I use it for the video capture.

If you press ALT F in GTR you get it's own FPS readout at the top right. Be carefull using this and/or FRAPS when racing as this type of FPS checking can cause the notorious 1FPS bug.

[x1m]

Sounds like you have v-sync enabled.

[_dobbo_]

x1m said:

Sounds like you have v-sync enabled.

in the game or in the GFX card config?

[x1m]

_dobbo_ said:

x1m said: Sounds like you have v-sync enabled. in the game or in the GFX card config?

Could be either.

[d-man]

Not used FRAPS, but does it record the minimum frame rate too? Thats the only number with any real meaning anyway.

[_dobbo_]

Done some more testing with V-sync, can't see much difference with the frame rate.. It can't be controlled in GTR so I turned it off with the driver tools.

Ran 3Dmark with 1 and 2 cards enabled and it's about twice as fast with two cards so I guess it is working!

[[k]ar|]

Another thing you might want to check out is what mode SLI is working in. SLI can work in one of three modes -

Compatibiliy Mode (single card only)
AFR - Alternate Frame Rendering (each card renders alternate frames)
SFR - Split Frame Rendering (each card renders a portion of the scene in each frame)

The nVidia SLI driver has a built-in function whereby each supported game has a profile which tells the nForce4 chipset which mode to run SLI in. IIRC, with the earlier drivers, the default mode where there is no profile for a particular game is compatibility mode - ie single card - although I understand that for later drivers, this was changed to AFR mode. This is important as GTR is not on the current SLI support list at the NVidia SLIzone site.

I would first try updating to the latest drivers to see if that helps. If not, you can create your own profile - plenty of links on google with guides on how to do this, but look here for the basics...

www.hardocp.com/article.html?art=NzExLDM=

... or here for a utility to help...

www.nforcershq.com/article2688.html


Hope this helps

[k]

[_dobbo_]

[quote=[k]ar|]
Hope this helps

[k]

[/quote]

Indeed it does. It would appear after some messing about that GTR very simply doesn't work with SLI - so I've been running one card the whole time!

Oh well.

[[k]ar|]

TBH, you're not really going to notice the difference going much above 60fps.

Another thing that might be causing this is the sgame becoming CPU-limited. Try cranking up the detail, resolution, antialiasing and filtering options to put more load on the GPUs, then force AFR.

This might improve the visual quality to make the most of your 60fps

[k]