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Will this power this? - Page 3

post #21 of 27
A lot of people talk about the +12V rail of a power supply, without having any idea just what they're talking about. In this case it's relevant.

Modern computers draw 80-90% of their power from the +12V rail. This unit has a +12V capacity of 26A, or 312W, which going by the 90% rule of thumb makes it about a 350W at best.

Yes, you can draw 430W from it, but only if you draw a ridiculous amount of power from the +5V and +3.3V rails. No real computer will draw a load like that; old Pentium 3 systems draw more from the +5V, and modern computers draw far more from the +12V. A lot of reviewers are still using way outdated/unrealistic load patterns, and that's letting PSUs like this scrape along.
post #22 of 27
Quote:
Originally Posted by Phaedrus2129 View Post
A lot of people talk about the +12V rail of a power supply, without having any idea just what they're talking about. In this case it's relevant.

Modern computers draw 80-90% of their power from the +12V rail. This unit has a +12V capacity of 26A, or 312W, which going by the 90% rule of thumb makes it about a 350W at best.

Yes, you can draw 430W from it, but only if you draw a ridiculous amount of power from the +5V and +3.3V rails. No real computer will draw a load like that; old Pentium 3 systems draw more from the +5V, and modern computers draw far more from the +12V. A lot of reviewers are still using way outdated/unrealistic load patterns, and that's letting PSUs like this scrape along.
You are like a jedi.
-definitive answer.
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post #23 of 27
Quote:
Originally Posted by Phaedrus2129 View Post
A lot of people talk about the +12V rail of a power supply, without having any idea just what they're talking about. In this case it's relevant.

Modern computers draw 80-90% of their power from the +12V rail. This unit has a +12V capacity of 26A, or 312W, which going by the 90% rule of thumb makes it about a 350W at best.

Yes, you can draw 430W from it, but only if you draw a ridiculous amount of power from the +5V and +3.3V rails. No real computer will draw a load like that; old Pentium 3 systems draw more from the +5V, and modern computers draw far more from the +12V. A lot of reviewers are still using way outdated/unrealistic load patterns, and that's letting PSUs like this scrape along.
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post #24 of 27
Quote:
Originally Posted by Phaedrus2129 View Post
A lot of people talk about the +12V rail of a power supply, without having any idea just what they're talking about. In this case it's relevant.

Modern computers draw 80-90% of their power from the +12V rail. This unit has a +12V capacity of 26A, or 312W, which going by the 90% rule of thumb makes it about a 350W at best.

Yes, you can draw 430W from it, but only if you draw a ridiculous amount of power from the +5V and +3.3V rails. No real computer will draw a load like that; old Pentium 3 systems draw more from the +5V, and modern computers draw far more from the +12V. A lot of reviewers are still using way outdated/unrealistic load patterns, and that's letting PSUs like this scrape along.
My point is, he doesn't NEED 430w to power that system. Heck, he could probably get by on 200 watts if he's just playing TF2...

The PSU can give out more than enough power for his uses.
post #25 of 27
Quote:
Originally Posted by SgtSpike View Post
My point is, he doesn't NEED 430w to power that system. Heck, he could probably get by on 200 watts if he's just playing TF2...

The PSU can give out more than enough power for his uses.
With a GTX260 and an overclocked i5 750?

He's going to be in the 300W range gaming, 350W range max, so maybe it might run, but it is not optimal. I like to see a little headroom.

"Headroom" does matter to an extent; it's just that most people tack headroom onto breathing space onto headroom onto peak power.
post #26 of 27
Thread Starter 
will be looking for a quality 400w in a couple weeks. i really hope it will last that long
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post #27 of 27
Quote:
Originally Posted by Phaedrus2129 View Post
With a GTX260 and an overclocked i5 750?

He's going to be in the 300W range gaming, 350W range max, so maybe it might run, but it is not optimal. I like to see a little headroom.

"Headroom" does matter to an extent; it's just that most people tack headroom onto breathing space onto headroom onto peak power.
He doesn't say overclocked, and his question was "Will this power this?", not "Will this power this and leave me some headroom as well?"

Sure, headroom is optimal. But when you're left with either using a PSU with no headroom or not using the rig at all, then you go with what you've got.
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