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Power Supply for GTX 460 / Future SLI

post #1 of 31
Thread Starter 
Hi all,

I have this power supply, bought 2 years ago:

http://www.newegg.com/Product/Produc...82E16817341010

I can't get any strict information on how exactly the 12V rails work...there's 4 rails at 18A a piece, with 2 6-pin PCI-e connectors. I'm imagining that 2 of those rails would be dedicated to each connector, and that I'll be all set running a GTX 460? It runs my single power connector 8800GT fine, but this is a completely different beast.

Also, I'm rather sure this PSU would not work for SLI with the GTX 460...considering, among other things, that it only has 2 6-pin connectors. What kind of PSU would I be looking at to support an SLI configuration with 2 GTX 460s?

Sorry for the cluelessness...and thanks in advance for any answers!
    
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post #2 of 31
It'll be fine with one, but not sure about two.

I'm gonna try giving GTX460 SLI a crack with a Corsair HX620; Anandtech's power draw figures were nowhere near that except on Furmark which is still 90+w away. Failing that, I've got a 1kw I can stuff in, but it's a tight fit so I'd probably need to end up swapping the whole rig into a different case. Hence the attempt to do SLI on a 620w PSU.
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post #3 of 31
any good 750w psu (like the corsaire i have) should be plenty.

i read a review where they had 2 gtx 460's in sli and OC'ed and the total power consmption under load was around 560w iirc. it may have been the anatech review but i definately remember seeing it.

edit: it was the anatech review see here http://www.anandtech.com/show/3810/n...vendor-cards/8
Edited by xmod - 7/13/10 at 1:09pm
    
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post #4 of 31
Quote:
Originally Posted by Lexxon87 View Post
Hi all,

I have this power supply, bought 2 years ago:

http://www.newegg.com/Product/Produc...82E16817341010

I can't get any strict information on how exactly the 12V rails work...there's 4 rails at 18A a piece, with 2 6-pin PCI-e connectors. I'm imagining that 2 of those rails would be dedicated to each connector, and that I'll be all set running a GTX 460? It runs my single power connector 8800GT fine, but this is a completely different beast.

Also, I'm rather sure this PSU would not work for SLI with the GTX 460...considering, among other things, that it only has 2 6-pin connectors. What kind of PSU would I be looking at to support an SLI configuration with 2 GTX 460s?

Sorry for the cluelessness...and thanks in advance for any answers!
Put a rig into your signature so people can see what other parts you're using. Like recommended, any 750W PSU should do the trick. Corsair is great with PSU but they're a little more on the expensive side. Make sure you check to have all the necessary cables if you're not going with the big brands. Get the Corsair 750W if you have the money, you will <3 it.
post #5 of 31
A good PSU for a pair of 460s in SLI would be:

Corsair HX750
http://www.newegg.com/Product/Produc...9010&Tpk=hx750

If you want a bit more headroom, spring for the HX850, but the HX750 would be more than enough for a pair of 460s.

The Corsair AX series is coming out, but the HX series are very, very well made PSUs and should be a bit cheaper as well
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2560x1440p Gaming
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post #6 of 31
Your PSU is surely fine for one and maybe also for SLI. I would try and see.
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post #7 of 31
Thread Starter 
Thanks, all--I'll update my rig in the signature, even though it's a real hackjob right now with a few Dell parts I got on the cheap.

About trying my current PSU for SLI--I only have 2 6-pin connectors. Is there another method to "convert" other connectors into 6-pins, or will that limitation pretty much ruin any chance of running SLI on my current PSU? I don't expect to run it on this supply anyways, but just curious Thanks!
    
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post #8 of 31
Quote:
Originally Posted by Lexxon87 View Post
Thanks, all--I'll update my rig in the signature, even though it's a real hackjob right now with a few Dell parts I got on the cheap.

About trying my current PSU for SLI--I only have 2 6-pin connectors. Is there another method to "convert" other connectors into 6-pins, or will that limitation pretty much ruin any chance of running SLI on my current PSU? I don't expect to run it on this supply anyways, but just curious Thanks!
The cards should each come with a twin-molex to 6-pin adaptor (or possibly two)... that will work, but it's a bit of a messy solution.
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Aoi
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post #9 of 31
it says it uses 160w so that is 160/12=13.33 amps per gpu so that means you need a psu that has 26.66 amps to be adequite just for the gpu's + the cpu 125 more watts and other stuff I would say your looking at at atleast 600w for an sli, the thing you want to watch out when you get a 4 rail is that you can't overpower a single rail so if you put a gpu with 13.33 amps on one rail you cant put a second one on that same rail nor can you put your cpu as you would overload it so if for some reason none of your components are compatible at filling up that rail then you lost that power to use. also means you can not upgrade to use any gpu that uses more then 18x12 216watts at max peek so your upgrading capabilities are limited if you have an 18x4x12 = 864 watt which should be listed anywhere from 800-1000 watt powersupply depending on how the company defines their powersupplies to me that should be fine but it means you have to do some work on calculating what component goes on which rail and got to be careful with upgrades honestly I like single rails you can pick up a 650 watt or 750 watt corsiar for cheap now and that will do you just fine a 750 can hold 2x 470's and some even get 2x 480's on that alone the more rails means more room for error and less efficiency and loss of usable power. Also since the capacators are smaller means it will deteriorate faster as well.
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post #10 of 31
While on the subject, how about mine? It's 700w, but not the best brand. I want to upgrade to a modular eventually, but will it handle 460sli? http://www.zipzoomfly.com/jsp/Produc...tCode=10009044
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In progress.
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