nVidia SLI Cards - Printable Version
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+--- Thread: nVidia SLI Cards (/showthread.php?tid=51963)
nVidia SLI Cards - Jeebs24 - 07.01.2008
Does anyone here use Nvidia Cards with SLI? I have the cards connected with the SLI connector but it doesn't seem to do any performance boost. Enabled or Disabled (switched through NVIDIA Control Panel) doesn't improve my frame rate.
Does anyone know what I am doing wrong?
- Guest - 12.01.2008
Have you enabled SLI in the nVidia control panel?
SLI use is off by default.
- Jeebs24 - 21.01.2008
Yes it was on. The strange thing is, on or off doesn't seem to make a difference.
- luther01 - 07.09.2008
sli doesn't make much difference with il-2. i use quad sli and this doesn't give much performance increase over single card operation
- Mysticpuma - 08.09.2008
Have you turned Vsync off?
With it on, it locks to your screen refresh rate, which on an LCD is usually 60Hz, so 60-fps.
With it off, you may have 'screen-tear', as the frames catch up with the draw rate, .ut you should (depending on your system) get over 120fps at 1600x1200.
Hope that helps.
Cheers, MP>
- luther01 - 08.09.2008
thanks for reply. i tried with and without v sync. sometimes get up to 200 fps without v-sync. there is small difference with and without sli, but not as much as i would expect/hope. have noticed that generally 9800 gx2 works better with newer games
- stansdds - 08.09.2008
Flight sims generally see little benefit from dual video cards because flight sims use the CPU far more than the video card. If you are running really high screen resolutions and high AA and AF, then multiple video cards will help a flight sim.
- PA_Willy - 08.09.2008
![[Image: 4870X2_1946.jpg]](http://www.simhq.com/_technology2/images/4870X2_1946.jpg)
http://www.simhq.com/_technology2/technology_130a.html
SLI/CF aren't adding benefits to this sim. Same performance with SLI/CF on/off.
- stansdds - 09.09.2008
The ATI 4870 is currently the fastest card available and that chart certainly shows that particular card as being fast enough to handle IL2 at high resolutions with a single card. With older cards there is a benefit in using two cards at high resolution.
- PA_Willy - 09.09.2008
stansdds Wrote:The ATI 4870 is currently the fastest card available and that chart certainly shows that particular card as being fast enough to handle IL2 at high resolutions with a single card. With older cards there is a benefit in using two cards at high resolution.
Firstly, the ATI 4870 isn't the fastest card available. The 280GTX is the fastest singl-GPU card, and the 4870X2 is the fastest dual card available.
Secondly, with two 4870 in CF you should see a performance boost at high resolution. You get the same benefits with one only card than with two of them. Consequence: SLI/CF doesn't improve our sim frames per second. Yes, one 4870 is enough, but you should see much more fps if the CF were working well.
With one card, with two or with a dual card (x2) you get the same performance in IL-2. Therefore, IL-2 isn't getting profit from dual systems.
Regards.