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Unexpected benefit of sli

post #1 of 11
Thread Starter 
So I just finished installing second 580 gtx and after inital tests, I'm "tickled pink". Not only are games more buttery smooth, but in games like JC2, my temps went from 87c on a single card to 65-72c on multiple cards- greatly reducing fan noise!

So far my only complaint is the cards don't come with the bridge. Took me 45minutes digging through the closet to find one

Is it normal for top card to be a little hotter than bottom? (makes sense but might as well check). I figure is has to do with heat rising and it being probably dusty as hell (cleanup coming this weekend!). Thoughts?
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Raven 2012
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post #2 of 11
Good to hear you have the bonus!

The top card is usually hotter in an SLI setup is mainly because its intake fan is usually restricted by the bottom card to breathe in fresh air. The rise of hot air is just a factor of second order.

As your Asus P6T V2 has an empty slot in between the 2 cards, air is relatively easy to go in for the top card. Do you have any extra fans for your 932 in addition to the stock fans?
post #3 of 11
Thread Starter 
Quote:
Originally Posted by windfire View Post
Good to hear you have the bonus!
Do you have any extra fans for your 932 in addition to the stock fans?
Negative- but default fans seem pretty good. I'm sure 200mm blowing right on top of them is helping. While I haven't looked hard, I'm not sure where I could put extra fans if I wanted to.
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post #4 of 11
Also, if you get over 60 fps, you can lock the game with v-sync, which will reduce the usage even more, as the cards don't need to work as hard, and it will drop temps a bit more as well.
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post #5 of 11
dont mean to hijack , but what does vsync do ?
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post #6 of 11
V-sync reduces the framerate to 60 FPS, to "lock" it at the same "number" as the refresh rate.

This ensures there is no visible "screen tearing", and like above poster mentioned, the temperature of the gFX cards will drop, as they won't require to work as hard...
post #7 of 11
Quote:
Originally Posted by TheChris2233 View Post
Negative- but default fans seem pretty good. I'm sure 200mm blowing right on top of them is helping. While I haven't looked hard, I'm not sure where I could put extra fans if I wanted to.
By 'extra fans', I mean like replacing the stock side panel 230mm fan by 1-4 120mm fan(s) or putting a 120/140mm fan next to the HDD cage as a mod.


Quote:
Originally Posted by delavan View Post
V-sync reduces the framerate to 60 FPS, to "lock" it at the same "number" as the refresh rate.
More accurately put, Vsync puts an upper limit on the framerate. It does not lock the actual fps at 60. The actual fps may dip below 60 but never rises above this cap.
post #8 of 11
Quote:
Originally Posted by delavan View Post
V-sync reduces the framerate to 60 FPS, to "lock" it at the same "number" as the refresh rate.

This ensures there is no visible "screen tearing", and like above poster mentioned, the temperature of the gFX cards will drop, as they won't require to work as hard...
And in my experience, vsync makes gaming pretty awful. Your system should be capable of running even the most demanding game above 60 FPS. Try turning vsync on and off... and you will notice a huge difference in the responsiveness of your mouse.

Basically, vsync should only really be used if you are having some serious screen tearing issues. Screen tearing is when your monitor gets out of sync processing the graphical information, causing the data on the top part of the screen to not line up with the bottom.

I keep it off... even on source games where I run a constant 299 FPS, just because it causes a lag on your mouse movement as it is limiting the frames.
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post #9 of 11
Quote:
Originally Posted by TheRealHeavyG View Post
And in my experience, vsync makes gaming pretty awful. Your system should be capable of running even the most demanding game above 60 FPS. Try turning vsync on and off... and you will notice a huge difference in the responsiveness of your mouse.

Basically, vsync should only really be used if you are having some serious screen tearing issues. Screen tearing is when your monitor gets out of sync processing the graphical information, causing the data on the top part of the screen to not line up with the bottom.

I keep it off... even on source games where I run a constant 299 FPS, just because it causes a lag on your mouse movement as it is limiting the frames.
Actually, the more powerful your system, the MORE likely it is that you'd want to use v-sync ... for the simple reason that more power means greater chance that you're running the game in excess of 60fps. And it's being > 60fps (assuming a 60Hz monitor) that causes the annoying tearing.

Admittedly, when playing an online competitive FPS it is a disadvantage to use v-sync due to the slight mouse lag it introduces. However, it works great for everything else ... it keeps the noise and temps down, removes tearing, and reduces the likelihood of microstutter.

Since I don't do the whole online FPS thing, I use it at all times. I'm a big fan of the v-sync.
    
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post #10 of 11
The mouse lag is easily handled by having a better mouse with good drivers.

There are also games which have the option to reduce that lag by making sure the mouse interrupts are going first.

This is very manageable, and when heat is an issue, v-sync helps a lot.
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