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Power for gtx460's in SLI

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#1
Quick question for you guys, how much power would I be needing with my desktop as it appears in my info plus another 460? I've been looking around and getting mixed answers some say sli460s with a core 2 quad will need 600 some say more like 700.

The problem is that my psu now is only 600 so I'm guessing if I want to run sli I'm going to have to upgrade that. Another thing to consider is that my video card and processor are both overclocked.

Thanks in advance!
 

newtekie1

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#2
I wouldn't risk it, when I ran SLI GTX460s with my X3370 Xeon(which uses less power than your Q6600) the setup popped a Thermaltake Toughpower 750w with better specs than your 600w. Those Fermi cards just suck down the juice. I wouldn't consider SLI on your setup with anything less than a decent 850w unit, or a really good 750w(like an HX750).
 

Frick

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#3
I wouldn't risk it, when I ran SLI GTX460s with my X3370 Xeon(which uses less power than your Q6600) the setup popped a Thermaltake Toughpower 750w with better specs than your 600w. Those Fermi cards just suck down the juice. I wouldn't consider SLI on your setup with anything less than a decent 850w unit, or a really good 750w(like an HX750).
That might not have been because the PSU was underpowered, it could just have been defective. The 460 pulls about 160W in Furmark, so a 750W unit would be just fine (if it's a decent unit).
 

cdawall

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#5
This is consumption at the wall with a 3.75ghz 965XE



Should be fine. This is however coming from the guy getting ready to toss 3 watercooled GTX 470's on his 850w :roll:

Edit:

Turns out guru3d tested dual GTX295's with that unit and mention it working with GTX 460 SLi

http://www.guru3d.com/articles_pages/ocz_stealthxstream_2_600w_psu_review,8.html

I do have to say though that for an 600W power supply, the cabling was a bit of a concern. On average I found cabling too short and especially for graphics cards to have only one 6-pin and one 6/8-pin PEG power connector ... that's just shy. To be able to connect our cards we had to use all kinds of converter cables. And especially with cards like a GeForce GTX 460, which you could setup in SLI with a PSU like shown today, we really feel the need for more PCIe GFX PEG headers.
 
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sneekypeet

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#6
While I have run my 2600K and 460s in SLI off a old Corsair HX520 PSU, everything was bone stock and I wasn't overclocking.

@ CD....I was throwing the crowbar in my HX1000 with three of them OC'd, could have been the PSU though too.
 

[Ion]

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#7
I run GTX460 SLI and a Core i7-860 @ 3.4GHz on an Antec TruePower New 650w.

I also have a system with a Core i7-2700k @ 4.4GHz and GTX470 SLI running on another TruePower New 650w. So I think you'll be totally fine with a quality 650w PSU :)
 

cdawall

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#8
While I have run my 2600K and 460s in SLI off a old Corsair HX520 PSU, everything was bone stock and I wasn't overclocking.

@ CD....I was throwing the crowbar in my HX1000 with three of them OC'd, could have been the PSU though too.
For mine I don't plan to clock them to much being under water drops the consumption way down anyway.
 
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#9
See, this is why im asking already people aren't agreeing haha
 

cdawall

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#10
See, this is why im asking already people aren't agreeing haha
The physical numbers say it can...Would I trust it forever? Probably not capacitor aging is a pain. Mine will only be on an 850W until I can afford grabbing a second unit.
 

Feänor

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#11
See, this is why im asking already people aren't agreeing haha
Remember the quality of the unit is almost more important than the wattage. My Corsair TX850 powered a i7 970 oced to 4,2ghz, and five different gpus (a gtx 275 co-op, a 9800gx2 and a gtx 260) also oced for over a year 24/7 before giving up in sparks and smoke. Some 1000w psu would have not last this long.

So choose yourself a 750w of good quality, the psu will run at its best at around 50% load. Less heat, less noise and a better and longer life.

Just my 2 cents.
 
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#12
^that being said I've had this psu for three years now so maybe an upgrade is in order
 
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#13
Running dual 460s with an overclocked AMD FX on a 750w here. No issues so far. Haven't seen the telltale GPU throttling when it is in need of power. I do have a 5.25in 250W GPU PSU I can drop in if needed.

As always, buy quality when you buy PSUs. I bought a lot of crap before I got my first Antec. Never went back since. Suckers are solid and last well. All my Antecs are still in use. My old, think it was a 530w, is still going strong in a friend's PC.
 

newtekie1

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#14
That might not have been because the PSU was underpowered, it could just have been defective. The 460 pulls about 160W in Furmark, so a 750W unit would be just fine (if it's a decent unit).
I think it was a combination of low quality and aging. It ran fine for 3 years with Dual-9800GTXs Folding, but popped within an hour of putting in the GTX460s.

I just wouldn't risk it, IMO getting a good 750w would be wise. Heck even a CX750 would do and is only $65 right now.
 
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#15
If i do get a different psu ill probably get an 800-900watt from the sell section on here.