750TX Question

[bfghornet]

Hello,

Would my Corsair 750tx be able to power an i7 920@3800, 6 gigs ram, 1 HD, 1DVD, 3x 250 fans, 2x 120 fans, and tri sli gtx260's ? Or is 2 gtx 260s the max I can do?

Thankyou for any help,

Bfghornet

[jonnyGURU]

I wouldn't do the three GTX260's. Not with the i7 fore sure. When we excercise just the cores here we can pull 300 to 400W from the wall with just one GTX260 card... never mind three.

[Spectre]

I wouldn't do the three GTX260's. Not with the i7 fore sure. When we excercise just the cores here we can pull 300 to 400W from the wall with just one GTX260 card... never mind three.

Pushups or jumping jacks?

[jonnyGURU]

Squats.

[cypherpunks]

Various net reviews measure the power consumption of a GTX260 as 120 to 140 watts. I'll assume 150 watts, which is the maximum you can pull through 2x 6-pin PCIe connectors anyway. So three of those would be 450 watts, plus another 150 for the processor and other stuff makes 600 watts of +12V power, or 5/6 of the 750TX's +12V rating. (Assuming 83% efficiency, you'll pull about 720W from the wall.)

This is higher than most people are comfortable running a PSU on a regular basis (kind of like you don't run your car near redline a lot unless you're a Formula 1 driver with a lot of spare engines in the garage), but as that's a true PSU rating, it will power on and operate within spec for quite a while before dying.

Indeed, if it dies within 5 years at that load, you can ask Corsair for a warranty replacement; it's been used hard, but not abused.

However, it honestly is likely to die within that time, and I'd be nervous about it taking expensive components with it.

Still, you can safely order a bigger power supply after your third GTX260 has arrived and been tested.

[spursindonesia]

IMHO, if you can have the budget for a 3 SLI rig, having a more capable PSU is not such an outrageous expenditure, is it ? :)

[Proximon]

Yeah, it's one thing when you are dirt poor and trying to supply 350W of power with a 400W rated PSU. Totally different than throwing 2K at a system then trying to make do with a $100 PSU :)