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Is this a bad idea?

YarwoodUK said:
Serious thread? Serious? Is it?

400w is near enough what Titan uses at full load..
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It uses around 250w according to guru3d but I'd say its a bit less than that. I love when people drastically overestimate how much power is needed! Not saying its 100 percent a safe bet to use a 400w psu with a titan, would depend on your other components. The psu comes with 1 8pin and 1 6pin so it can't be that crazy an idea.

From testing other graphics cards with a power meter the max my complete system w/ titan will use at full load is 300w. I guess this is what I should be asking (is it safe to run a 400w psu @ 75 percent load regularly) to get more helpful responses instead of ARE YOU STUPID?!??! :D
 
spixelspixel said:
Can't remember exactly where I read it but might be this

http://www.jonnyguru.com/forums/showthread.php?t=3990

My 650w be quiet dark power 10 had a switch that allowed you to change between single and multi rail, never used it though !
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In most cases, multiple +12V rails are actually just a single +12V source just split up into multiple +12V outputs each with a limited output capability.
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The only "problem" the occurs with multiple +12V rails is that when a +12V rail is overloaded (for example: more than 20A is being demanded from a rail set to only deliver up to 20A), the PSU shuts down. Since there are no "limits" on single +12V rail PSU's, you can not overload the rails and cause them to shut down..... unless you're using a "too-small" PSU in the first place. Single +12V rails do not have better voltage regulation, do not have better ripple filtering, etc. unless the PSU is better to begin with.
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Ok... What's the bottom line?


The bottom line is, for 99% of the folks out there single vs. multiple +12V rails is a NON ISSUE. It's something that has been hyped up by marketing folks on BOTH SIDES of the fence. Too often we see mis-prioritized requests for PSU advice: Asking "what single +12V rail PSU should I get" when the person isn't even running SLI! Unless you're running a plethora of Peltiers in your machine, it should be a non-issue assuming that the PSU has all of the connectors your machine requires and there are no need for "splitters" (see Example 1 in the previous bullet point).
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:p

The E9 400w natively has both an 8pin pci-e and a 6pin. I don't think the manufacturers would have put it there if it can't handle a graphics card that requires it.
 
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But he has given an example of an issue that you may have.

If you want to risk it, then go ahead, there's no harm in trying. But you're asking A LOT from that PSU.
 
Rossi~ said:
But he has given an example of an issue that you may have.

If you want to risk it, then go ahead, there's no harm in trying. But you're asking A LOT from that PSU.
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The worst that could happen is that the psu's safety features kick in and powers it off? I'm going to send an email to be quiet and see what they recommend :-)

smogsy said:
if it breaks, your going to give us each £100 right, for good advice in the future
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of course!
 
spixelspixel said:
:p

The E9 400w natively has both an 8pin pci-e and a 6pin. I don't think the manufacturers would have put it there if it can't handle a graphics card that requires it.
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You can't cherry pick parts of the article. The long and short of it is that you're going to have a single - quite power hungry - part on one of the rails and that rail will be overloaded. This could cause failure which may then damage your components. Chances are probably quite small but they're considerably larger than if you just run a PSU with more output.

I'm not going to pretend I understand why you don't just buy another decent 550-650W PSU rather than risk an 800 quid card. You ARE risking it. Whether or not anything happens is another matter.
 
I'm just posting the conclusion as opposed to rossi's cherrypicking haha :)

A multi rail 12v psu is powered by a single 12v rail. Its just additional traces on the board which give extra protection limits. If the psu is setup in such a way that it can provide enough power for an 8pin and 6pin pci-e while staying 100w under its max of 400w capacity then I don't see there being any risk at all.
 
what wattage can it supply at 12v?
The rail figures are max per rail but I doubt 18a can be sustained over all 3 (12vx18a x3=648)




edit: should refresh the page, looks like it been coverd.

Its your choice but you are pushing it. Also any oc is going to be totally out of the question.
 
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is there a wiring diagram for that PSU anywhere, I had a quick look and couldn't find one

as long as the mobo and the 2 PCIe connectors are on seperate rails there is a chance that it will be fine... if both the PCIe connectors are on the same rail then I would not use them both as they could then draw 150+75 = 225 over a rail only rated to 216w
you might need to use a molex to 6 pin connector to make sure all 3 cables are on seperate rails
 
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