I don't see why not. I run 2 GTX 770's on a Corsair RM650 and the fan rarely spools up.

but 770's draw less power under full load than 670's..

But i can't see it blowing up anytime soon. A 750 would cover it easily.

Just looking, I've not seen a 670 that draws more than 220W at full load. So make that around 450W for them both to be at full load.

Add an extra 100W [Depending on CPU] for your other hardware and you notice you will only use around 550W at max which means you also have a bit of head room which is nice to have.

Do you really need another card? Are you feeling that your card isnt forming as well?

personally, Id wait it out till you can afford a 970 or spend and extra 20GBP and get a 960. It performs around the same as a 770. Its up to you whether you feel that you need the extra performance.

Xigyy wrote Just looking, I've not seen a 670 that draws more than 220W at full load. So make that around 450W for them both to be at full load.

Add an extra 100W [Depending on CPU] for your other hardware and you notice you will only use around 550W at max which means you also have a bit of head room which is nice to have.

Do you really need another card? Are you feeling that your card isnt forming as well?

personally, Id wait it out till you can afford a 970 or spend and extra 20GBP and get a 960. It performs around the same as a 770. Its up to you whether you feel that you need the extra performance.

Thanks for the input guys. Reason I asked is because I've been looking around and seeing mixed opinions, some saying it's enough and some saying it'd be better to go with a 750w.

MY CPU is a 3570K OC'd to 4.5GHz. And well I was looking to SLI because of the system specs of newer titles (Witcher 3 being the main one - recommends a 670 for 30fps). And since I won't be going to 1440p any time soon, I don't need the extra Vram.

Adding a 2nd 670 won't double your performance FYI. You could run 2x670's in SLI, and it will perform simialry to 2x 760's in SLI. A GTX 960 would perform slightly poorer, but it would be better to have a single card. Entirely up to you. Also, make sure your motherboard supports SLI first.

Craigyy wrote I don't see why not. I run 2 GTX 770's on a Corsair RM650 and the fan rarely spools up.

but 770's draw less power under full load than 670's..

But i can't see it blowing up anytime soon. A 750 would cover it easily.

My system was supposed to use about 500 watts and I use an RM650 as well. The fan *never* spins up and I honestly think I could add in a second GTX 780 without any issues at all.

Alfa wrote

Craigyy wrote I don't see why not. I run 2 GTX 770's on a Corsair RM650 and the fan rarely spools up.

but 770's draw less power under full load than 670's..

But i can't see it blowing up anytime soon. A 750 would cover it easily.

My system was supposed to use about 500 watts and I use an RM650 as well. The fan *never* spins up and I honestly think I could add in a second GTX 780 without any issues at all.

Do that... leave your house for a couple of mins

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We all know how reliable RM units are.

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Xigyy wrote

Alfa wrote

Craigyy wrote I don't see why not. I run 2 GTX 770's on a Corsair RM650 and the fan rarely spools up.

but 770's draw less power under full load than 670's..

But i can't see it blowing up anytime soon. A 750 would cover it easily.

My system was supposed to use about 500 watts and I use an RM650 as well. The fan *never* spins up and I honestly think I could add in a second GTX 780 without any issues at all.

Do that... leave your house for a couple of mins

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We all know how reliable RM units are.

Rm units are decent, the 550 one is a bit dodgy, but the 650 upwards are actually decent units.

The 550 one has been known for being overpriced for the performance it gives, but it is the only one in the range that I could say that to.

Don't underestimate the power of the dark side CHANG!

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