3 way sli,one card detected

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kakaro

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Oct 11, 2013
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Hi guys i have a problem with 3 way sli.2way works fine,but when i try 3 way an booth only one card is detected in bios an in nvidia control panel'even though all 3 cards fans is spining an power led is correct.i dont know if my psu is the prob,its a 750 watt ocz fatality 80 plus bronz.is it enough power? Iveseen jj from asus use a 750 watt to power 3 660ti. Ive tried changing to latest bios 1903,ive download the latest gpu driver 327.23,ive check each card individually, reseated the cards,switch around cards,delete new drivers an reinstall im frustrated much help asap is apreciated.my spec. 600t ,maximus v extreme,i5 3570k,16gb corsair veng 1866,h100i 3 asus 660 ti dc2o
 
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4745454b
And since the PSU is only 80+ Bronze, it probably does not output much more than 700w
Click to expand...

How do you figure? It's sold and marketed as a 750W PSU and OCZ is not one of "those companies". It can do 750 or really close to that I'm sure.

Looking online the 660TI is rated to draw around 150W. So you'd need 450-500W just for the cards. Another 77W for the CPU and lets say 50 more for the rest of the system. So around 600W? Assuming all it stock. Problem is you can't even get it to boot with all three working which should drop the power down a ton. I do agree it sounds like a power problem. I'm sure like most/all 750W that it only has 4 PCIe plugs and you are using adapters to power the third card. Find a good PSU that has the...
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4745454b

4745454b

Titan
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Apr 29, 2006
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And since the PSU is only 80+ Bronze, it probably does not output much more than 700w
Click to expand...

How do you figure? It's sold and marketed as a 750W PSU and OCZ is not one of "those companies". It can do 750 or really close to that I'm sure.

Looking online the 660TI is rated to draw around 150W. So you'd need 450-500W just for the cards. Another 77W for the CPU and lets say 50 more for the rest of the system. So around 600W? Assuming all it stock. Problem is you can't even get it to boot with all three working which should drop the power down a ton. I do agree it sounds like a power problem. I'm sure like most/all 750W that it only has 4 PCIe plugs and you are using adapters to power the third card. Find a good PSU that has the adapters you need natively and you should be fine. As I showed above you don't need crazy power. The 660TI isn't a high draw card. You really just need more plugs.

Edit: Here is the load test for this PSU.

http://www.hardwaresecrets.com/article/OCZ-Fatal1ty-750-W-Power-Supply-Review/1019/7

748W. Not bad for a "bronze" unit. This also has "four" rails which aren't labeled well on the outside. Probably a good part of the problem.

http://www.hardwaresecrets.com/article/OCZ-Fatal1ty-750-W-Power-Supply-Review/1019/6

Therefore, you may end up having your CPU and your video card running on the same rail, and even two video cards and the CPU running on the same rail.
Click to expand...

Four rails is fine for 1500W units, but 750W units can lead to problems.

Edited to add PSU info.
 
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