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fast question about SLI

post #1 of 7
Thread Starter 
I browsed around and thought this will not be big bother even if it's been answered.

If I add another Nvidia's 560ti to my system, what are the things that will happen frankly?

does the temperature of both decrease, but overall increase? (taking they share work)
will it be more stable?
does it "double" the effectiveness, or is it more like just 1.3x

I thought of doubling ram and put another GPU before skyrim so they should be cheap by then. Then again I got 8gigs of ram so not so needed.
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post #2 of 7
They will both increase in temperature as they'll heat the pci area up a lot more. They do 'share' work (usually rendering every other frame) but most games will use both cards @ 99% anyway.

Make sure your PSU is up to it; 2 560s will draw a lot of power on the 12v rail.

No, it will not make it more stable, if anything it will make it less stable as you have more hardware to fail, and you could also suffer from dual gpu problems such as the well-known microstuttering.

SLI scaling can be anything between 100% and 199% tbh...most modern games will be closer to 199%, though, so you'll get almost double the performance.
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post #3 of 7
This is just what I know from reading SLI threads.

SLI scaling drastically varies upon the cards and drivers, but it's apparently extremely rare to see double performance. Apparently 70-90% is the normal increase. Other factors come into play too though.

Someone else should comment that has 2 GTX 560 Ti's in SLI.

Depending on how close the cards are the top one will likely run warmer since it has less breathing room.

8GB of ram is more than enough as long as you dual channeled it and are using the proper speed.
Edited by Ascii Aficionado - 6/3/11 at 10:11am
post #4 of 7
The first card's temp increase's a bit because it's airflow is limited by having the second part infront of it and the card's will heat your case good.

They don't scale 100% so it's not necessarily double the performance but it's close.

SLI/ xfire is always less stable then a single card solution but you shouldn't have any problem's.
post #5 of 7
Thread Starter 
Thanks for great information all. I will not purchase another unless I am unable to run skyrim at it's fullest when it's released. I want every last bit out of that game
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My System
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Phenom II X6 1090T Black Edition, AM3, 3.2GHz ASUS M4A89GTD-PRO/USB3 GeForce GTX 560ti (palit) 4GB, DDR3 1333MHz, CL9 (2x) 
Hard DriveOSPower
1TB Caviar Black, SATA 3, 7200rpm, 64MB Windows 7 750W "Super Series" ATX-virtalähde / Cable managem 
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post #6 of 7
Hi, my advice is to make sure you have somewhere around 750 watt PSU for SLI.

I was running only 1 560Ti at the time using a 500Watt PSU and guess what? My power supply literally went 4th of July on me when I was playing Crysis 2 for about 13 minutes or so.
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Anatolii
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Kirovskaya
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Samsung 840 EVO 500gb Samsung 950 Pro 512GB Samsung 850 EVO 1TB Mushkin Reactor 1TB 
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CaseAudio
Caselabs White SMA8 Logitech Z-5500 
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post #7 of 7
Quote:
Originally Posted by Kiros View Post
Hi, my advice is to make sure you have somewhere around 750 watt PSU for SLI.

I was running only 1 560Ti at the time using a 500Watt PSU and guess what? My power supply literally went 4th of July on me when I was playing Crysis 2 for about 13 minutes or so.
No. Just no. A 650 watt PSU is more than enough for 560 SLI. An overclocked i7 + 2 560s will consume less than 500 watts from the wall, less than 450 from the PSU itself. If your 500 watter died from one 560, that was the PSUs fault itself, nothing else. A quality 400 watt would power your rig with one 560.

OP: It WILL heat up your case quite a bit when you're gaming, so make sure you have good case airflow. As long as you can exhaust that heat you're gold. Performance wise, expect your current average frame rates to become your new minimums - which means much smooth-er game play.
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