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GTX 460 1 Gb SLI on 700w??

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July 28, 2010 6:38:01 PM

So I recently upgraded my entire pc besides my PSU, at the moment I have an OCZ ModXStream Pro 700w seen here:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

The rest of my rig contains the following:
i7-860 @ 3.8
Corsair H50
3x Spinpoint F3s
GTX 460 1Gb
plus 3 case fans and DVD-Ram Drive

Anyways to get to my question, I'm thinking about adding another GTX 460 1Gb to my build but I'm not sure if my present PSU can handle it. Anyone with experience with this PSU or can chime in?

Thank you Again TH

More about : gtx 460 sli 700w

a b ) Power supply
July 28, 2010 9:56:31 PM

the 460's draw about 300w at stock iirc so if you've got one of the OC'd model I would definitely be looking for a beefier PS
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a c 272 ) Power supply
July 28, 2010 10:04:03 PM


The GTX 460s in SLi are only pulling 470W from the wall, add in about 150W of CPU load and you are still good.
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a b ) Power supply
July 28, 2010 10:11:38 PM

^^Agreed with popatim.

for stock it should be enough, barely. With 550W available on the 12V rail, you're coming really close to its limit with an OCed 870
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Best solution

a c 139 ) Power supply
July 28, 2010 10:17:17 PM

milbrandt1 said:
Anyways to get to my question, I'm thinking about adding another GTX 460 1Gb to my build but I'm not sure if my present PSU can handle it.
Based on a few GTX 460 SLI reviews I looked at that OCZ ModXStream Pro 700W PSU should do OK.
Hexus Review - FudZilla - LegitReviews - AnandTech
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July 28, 2010 11:53:58 PM

Thanks for the info guys, I'm going to try my luck with the OCZ. Is there a risk of physical damage going this route? Like cutting components short?

Also, WR2, or any of you guys, have any idea where I can get that GTX 460 EVGA Precision Skin on WR2's FudZilla link? I want that thing haha

And Timop thanks for the reply, I feel like you're always there when I ask a question haha, and I appreciate that, Thanks Again
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Anonymous
July 29, 2010 12:08:53 AM

When running any computer on a power supply that has a chance of not being powerful enough, there is a small potential of parts being damaged. With a unit from OCZ you should be fine though because you can be certain that it will have an overload control which will shut it down if you're trying to draw more power from it than is safe.

EDIT:


Source

What even is the precision skin? A physical skin or what?
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a b ) Power supply
July 29, 2010 12:18:30 AM

^ Its a skin for the EVGA precision program, which is a nifty OC program like Rivatuner/Afterbuner.
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Anonymous
July 29, 2010 12:20:56 AM

Ah right, thanks. I thought that it could be the name of the program but then I thought it would be silly to call a program a "skin" xD

It's obvious now; should've worked it out really.
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a c 139 ) Power supply
July 29, 2010 12:26:43 AM

milbrandt1 said:
Thanks for the info guys, I'm going to try my luck with the OCZ. Is there a risk of physical damage going this route?
I'd roll back your CPU overclock to stock for your initial testing. Once you have your system running stable and have tested everything out under load you can start bumping up your CPU in increments, testing as you go.
That should reduce the chance of an unpleasant experience.

I did find one 'knock' on the OCZ ModXStream Pro 700w Hotbox @ HardOCP
I'm pretty sure that unusually hot PSU/case condition they're talking about won't apply to you. The PSU pulled is full rated power @ 40C.

That control panel skin is probably part of the EVGA software package for it's GTX 460.
I didn't see a download option for the control panel software.
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July 29, 2010 12:37:21 AM

WR2 said:
I'd roll back your CPU overclock to stock for your initial testing. Once you have your system running stable and have tested everything out under load you can start bumping up your CPU in increments, testing as you go.
That should reduce the chance of an unpleasant experience.

I did find one 'knock' on the OCZ ModXStream Pro 700w Hotbox @ HardOCP
I'm pretty sure that unusually hot PSU/case condition they're talking about won't apply to you. The PSU pulled is full rated power @ 40C.

That control panel skin is probably part of the EVGA software package for it's GTX 460.
I didn't see a download option for the control panel software.


Thanks Alot for this WR2, and you're right, I just explored the software disc that came with the GPU and the skin was on there. If anyone wants them (460, 465, 470, 480) let me know and I can upload them to Megaupload.
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July 29, 2010 12:39:27 AM

the ocz modxstream pro 700w has only two pci-e connectors. you will need two molex to pci-e convertorseach needs two molex conncetors.
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Anonymous
July 29, 2010 12:41:03 AM

Wow. None of us had actually managed to notice that :p 
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a c 139 ) Power supply
July 29, 2010 12:42:26 AM

I had noticed it - but since he owns the PSU already and the molex to PCI-e adapters are in the card's accessory pack I didnt think it was an issue to be concerned about.
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July 29, 2010 12:42:54 AM

narwen said:
the ocz modxstream pro 700w has only two pci-e connectors. you will need two molex to pci-e convertorseach needs two molex conncetors.


Lucky for me I already have like 4 of them :D  , Thank You for the response
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a c 272 ) Power supply
July 29, 2010 12:43:17 AM

Damn, he is right! How did we all miss that?

Chances are each card came with one, my 4850 did, if they do then you will be okay.
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a c 139 ) Power supply
July 29, 2010 12:44:46 AM

EVGA are a class act. He might have two for each card.
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a c 139 ) Power supply
July 29, 2010 12:47:14 AM

Be sure to let us know how things work out for you!

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Anonymous
July 29, 2010 12:47:42 AM

In that case then it is not a problem ;) 
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July 29, 2010 12:49:53 AM

WR2 said:
Be sure to let us know how things work out for you!


Will do, I probably won't be getting my second one for a month or so, but I'll report back, Thanks Everyone
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July 29, 2010 12:50:17 AM

Best answer selected by milbrandt1.
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July 29, 2010 12:53:35 AM

it has a max of 25a per rail, if pci-e and molex connectors are on same rail they will draw to much power.
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Anonymous
July 29, 2010 12:56:18 AM

With dual rail PSUs, it is set up so that the CPU draws power from one +12v rail and EVERYTHING else from the other. Therefore it won't actually make a difference.
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July 29, 2010 1:07:55 AM

if every thing else is connected to second rail then no good
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Anonymous
July 29, 2010 1:12:09 AM

Well that's how dual rails work... I'm pretty sure there aren't any dual rail power supplies out there which don't give the CPU its own rail. That's why I got a PSU with a single rail (XFX XXX Edition 650w with 52A - yet to arrive :) )
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July 29, 2010 1:16:06 AM

each rail only supples max of 25a, 460 in sli not overclocked use 26a on there own if overclocked then 30a plus.
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Anonymous
July 29, 2010 11:52:21 AM

I can't actually find anywhere the +12v requirements for two cards in SLI.
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Anonymous
July 29, 2010 11:54:55 AM

On the Palit site it says that one card (their overclocked version or not) requires a 450W PSU with 24A on the +12v rail(s). Obviously it doesn't mean that the card requires all that power to itself.

Following your logic, that means that you would need a 900W power supply just to run the cards and nothing else, and 48A on the +12 rails to do the same thing. I'm sure that where you got that from was saying that you need 26A on the +12v rails, not that the card uses that much.
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July 29, 2010 9:21:16 PM

48a on single rail would be plenty he was talking about sli
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Anonymous
July 29, 2010 9:54:50 PM

Of course he was talking about SLI.
Alright, I agree with you that each card uses UP TO 155w (I think the TDP is actually 160W). That means he needs 320W for the cards alone. So, on wattage he will be fine with 700W; the rest of his system will not need anywhere near 380W.

I'd be more likely to believe you if you actually told me where you were getting this 26A from.
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July 30, 2010 1:25:03 AM

wattage = volts * amps.

first review above shows max watts per 460 =155w, 155w*2= 310w for sli =26a

second review above shows max 25a for any rail max combined rails 46a = 552w

the psu you have ordered is 52a * 12v = 624w on one rail far superior
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Anonymous
July 30, 2010 1:32:24 AM

I understand that wattage = volts * amps, and that my PSU (well, should be arriving soon) has a total of 624W availalable on the +12v rail and the XFX only has 552W, but I STILL don't understand where this "26A" is from.
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July 30, 2010 1:54:43 AM

310w / 12 = 26a
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Anonymous
July 30, 2010 2:00:06 AM

Aaaaaaaaahhh, okay, I get it now.
I fear it's probably too late for the OP, seeing as everyone else has stopped responding to this thread.

Anyway, thanks for explaining to me what you mean (took me a while to get it lol)
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July 30, 2010 2:04:20 AM

no problem :-)
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a c 139 ) Power supply
July 30, 2010 1:06:11 PM

Not likely that 1 rail of 25amps (300watts) is dedicated to the CPU alone. It's far more than the average CPU requires.
More likely the big +12 power draw items (CPU and GPU) are split between the two 'rails'.

Each PCI-e slot can provide up to 75watts from the motherboard (supplied from the ATX 24pin connector) before any PCI-e power connectors are needed.

It's pretty much set up so what ever component needs power - gets power, up to the full rated capability (and a bit more for transient peaks). The 25amp 'rail limit' is more of a OCP (over current protection) design goal than an actual electrical limitation.

Antec talks about it's own OCP engineering in a Myth Busted article. Antec talks about a 40amp 'clamp point' on it's 25amp rail. Most PSU MFGRs aren't quite so open about their engineering standards.
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November 30, 2010 11:28:52 PM

ok i have i question. I am trying a sli 460 on 600w. I know its going to be close! I have a Zalman psu with 4 rails, does it matter which rails i attempt to pull from, or should i be trying to pull from across all of them?
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November 30, 2010 11:40:23 PM

The PSU is ready for your SLI or CrossFire configuration with 2 PCIe connections. There are also 6 SATA, 4 Molex and 2 Floppy connectors so you load your system however you need to. A four rail configuration balances the power output for consistent performance.

4 rail?? really?

2x 25amp max 552w at 12volt is kinda pushing it for a oc system.

the 552w max means you cant even pull 25amp from both rails.. that would be 600W~~

for comparison a 750w pc power and cooling has 60AMP available on one rail.

if you have 2 rails at 25amp how do you balance 2 video cards and the rest of the computer equally? its not rocket science but its more than random plugging in of stuff

I know if I run the occt benchmark with PSU test it hits 500watts at the wall with a single 460 and a q6600 at 3.2ghz the psu i have is 80-85% eff.
do some math= its pretty close to max load. I dont trust a OCZ psu like I would a seasonic, enermax, corsair etc.
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