I want to SLI

[krissy321]

Hello,
I am wanting to SLI two 560ti SC
my current power supply is the Corsair HX650W which I don't think will be able to handle it

my system specs are
CPU- Phenom II x6 1090t @ 3.2GHz
RAM- 6GB OCZ 6400 DDR3
MOBO- Asus M4N98TD EVO
HDD 1.5TB 7200RPM
GTX- 560ti SC wanting another

Cooling
fans- 9 120mm non LED
cpu- Zalman 9900nt LED
case- cm stacker 830

anything else you need to know? Sorry im not sure

 

[Uther39]

You may get away with it, but a 750-850w PSU would make it all safe and sure.

 

[Silvune]

The Corsair HX650 is certainly able to power a build with two GTX560 Tis. The only question is whether it has enough 'buffer' for you to feel safe.

http://www.guru3d.com/article/geforce-gtx-560-ti-sli-review/14
This shows a system with an i7-965, which is more power hungry than a Phenom II X6 1090T. They drew 449W at the wall, take 10-20% off to get their actual system power draw and I think you have a realistic worst case scenario for your own power consumption. ~404W would only stress a 650W PSU to 62%.

Your typical power consumption will be much lower than this, but I personally wouldn't feel worried if my PSU (a high quality one such as the HX650) was being asked to provide 60% of its rated wattage when it is perfectly capable of providing 100% of its stated wattage for extended periods of time.

 

[Mousemonkey]

Just an FYI, I'm running my 2600K and SLi'd GTX560's on a Corsair HX620HX. So yes, the HX650 will be able to run the OP's rig should they pop another 560 in there.

 

[AdrianPerry]

It will run, but ideally a 750/850w would be recommended just to save stressing the PSU too much and allowing yourself some headroom.

Im also presuming 650w wouldn't be able to handle any over-clocking of the CPU/GPU?

 

[Mousemonkey]

It will run, but ideally a 750/850w would be recommended just to save stressing the PSU too much and allowing yourself some headroom.

Im also presuming 650w wouldn't be able to handle any over-clocking of the CPU/GPU?

My cards are clocked at 900mhz and the CPU has been running @4.4ghz.

 

[delluser1]

The Corsair HX650 is certainly able to power a build with two GTX560 Tis. The only question is whether it has enough 'buffer' for you to feel safe.

http://www.guru3d.com/article/geforce-gtx-560-ti-sli-review/14
This shows a system with an i7-965, which is more power hungry than a Phenom II X6 1090T. They drew 449W at the wall, take 10-20% off to get their actual system power draw and I think you have a realistic worst case scenario for your own power consumption. ~404W would only stress a 650W PSU to 62%.

Your typical power consumption will be much lower than this, but I personally wouldn't feel worried if my PSU (a high quality one such as the HX650) was being asked to provide 60% of its rated wattage when it is perfectly capable of providing 100% of its stated wattage for extended periods of time.

Best Answer

 

[AdrianPerry]

Ah fair enough MouseMonkey I stand corrected.

That's put my mind at ease at running my build off an XFX 750w PSU
~i5-2500k @ 4.4GHz
~GTX 560Ti @ 950mhz

I thought id have to think about buying an 850w PSU when i went SLI Saved me a good £100 there

 

[Mousemonkey]

Ah fair enough MouseMonkey I stand corrected.

That's put my mind at ease at running my build off an XFX 750w PSU
~i5-2500k @ 4.4GHz
~GTX 560Ti @ 950mhz

I thought id have to think about buying an 850w PSU when i went SLI Saved me a good £100 there

I'm glad to hear that, also bear in mind that my PSU is about six years old now which just goes to prove that a good PSU really is worth it's weight on gold IMHO.