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Is my PSU to weak for an SLI config?

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  • Configuration
  • Graphics
Last response: in Graphics & Displays
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March 5, 2014 9:04:50 PM

Ok so I just got a brand new Nvidia Geforce GTX 660 OC verson to ad to the one I already have. my mobo is MSI Z87-G45, PSU IN WIN commander 2 850W, CPU is intel i5 4670k. I also have 2 120gb SSD, 1 1T WD, and a optical drive. my symptoms are my second video card is not showing up in device manager. so I went ahead and swapped the cards out from slot to slot. both cards worked fine in first slot. both worked in second slot, however the reseloution is set to very low. (can't remember exact res it was set to). also when I booted up with the card in second slot it said something about Samsung magic does not support that res and will set to default. after swapping the cards back to original config (without the sli) my comp began to blow the breaker in my living room. (comp not powered up). after being frustraded I brought my computer upstairs to a new plug. no crash, no breaker blown. but back to original problem now. any and all help/idea with this would be greatly appreciated. oh I forgot, I also just installed a cooler master Seidon 120m liquid cpu cooler.

Geforce GTX 660 OC verson x2
MSI Z87-G45
intel i5 4670k - cooler master Seidon 120m liquid cpu cooler
120gb SSD x2
1T WD
IN WIN commander 2 850W

More about : psu weak sli config

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March 5, 2014 9:10:44 PM

Check your wires and/or check for shorts...but according to the stats 450 watts required per one...that's 900 watts just for those. You said you have an 850 and when both are in it blows a fuse to protect your computer be careful before you fry something. sounds like you need a 1000 watt or at least 950 for some extra room.
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March 5, 2014 9:14:45 PM

ThOmAs McCoOy said:
Check your wires and/or check for shorts...but according to the stats 450 watts required per one...that's 900 watts just for those. You said you have an 850 and when both are in it blows a fuse to protect your computer be careful before you fry something.


I was thinking it was my PSU was just hoping/wondering because when I plug comp in upstairs it doesn't blow a fuse. (breaker in the house is what was going, nothing in comp) also I forgot to mention I checked all conectiontion three times. I think you are right however. my psu is to weak. on a different note. this is my first sli config and I am not sure if I need to change anything in the bios/physically on the mobo.

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March 5, 2014 9:18:47 PM

I assume you should only have to go into Geforce control panel and mess with that stuff but you should be able to get a decent power supply for pretty cheap check newegg and frozencpu or even amazon.
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March 5, 2014 9:26:46 PM

SLI config needs no more than 850W power supply, but the power supply you had is pretty low quality, so I wouldn't be surprised if something breaks. PSU and motherboard are the most important components in a PC, for safety purpose anyway. Therefore, do not go with a cheap PSU whenever possible. Only buy PSU from popular will save your components for a long time, it's lucky for you that nothing else got destroyed, I've heard stories about how a PSU blow up and the entire system was blown off.

Anyways, go with
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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March 5, 2014 9:32:35 PM

IDontUnderstand said:
SLI config needs no more than 850W power supply, but the power supply you had is pretty low quality, so I wouldn't be surprised if something breaks. PSU and motherboard are the most important components in a PC, for safety purpose anyway. Therefore, do not go with a cheap PSU whenever possible. Only buy PSU from popular will save your components for a long time, it's lucky for you that nothing else got destroyed, I've heard stories about how a PSU blow up and the entire system was blown off.

Anyways, go with
http://www.newegg.com/Product/Product.aspx?Item=N82E168...


Their was a post on here earlier today about a guy who actually blew his power supply up like a little bomb, that stuff happens often during simple mistakes or just accidents.
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March 5, 2014 9:35:20 PM

GTX 660 SLI needs only about 600W (source), and your power supply is a decent one. Hardware Secrets (a trusted PSU testing site) gave it their silver award so I don't think your PSU is the problem.

Make sure you are connecting the PSU to both graphics cards
Make sure you have the SLI bridge connected
Go into your nvidia control panel and turn SLI on (select maximize 3D performance).
Make sure you have the latest nvidia drivers
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March 5, 2014 9:40:35 PM

jimthenagual said:
GTX 660 SLI needs only about 600W (source), and your power supply is a decent one. Hardware Secrets (a trusted PSU testing site) gave it their silver award so I don't think your PSU is the problem.


Sorry, I should've checked the PSU model first, I kind of just assumed that it's a cheap brand since they make low price accessories. My bad.
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