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How can I check if my system needs more PSU power?

Right now I am shopping for new computer parts. I desperately need a quad core, the dual core gets overloaded pretty quick when I try to livestream while gaming.

So I've come together with this combination:

ASUS P8H67 Rev 3.0, Sockel 1155, ATX, DDR3 4GB Corsair Valueselect DDR3-1333 CL9 x 4 = 16 gb RAM Intel Core i5-2500 Box, LGA1155

I am going to keep my current graphics card, which is:

ATI Radeon HD5770, 1 GB RAM

Also I have two hard drives, a DVD burner and a lot of USB devices attached. I also have an internal TV-tuner-card.

It should be noted that I may put my old Radeon HD3850 into the PC too. Not for the sake of crossfire, but for the sake of trying out BeTwin ( Also the reason why 16 GB of RAM. I want to try if two guys can game on one PC with BeTwin. Most games only use two cores so that could maybe work (I tried it on a Windows XP machine a few years ago and it worked great).

My current Coolermaster PSU seems to be dying (crashes, when I attach the power of an E-Sata drive powered by the PC the PC turns off instantly, etc) which is why I'll need a new one.

But I don't know what kind of PSU I'll need for the requirements stated above. How many watts will I need? Also how many ampers of 12v, which is important afaik, will I need?

Thanks for your answers

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marked as duplicate by Kyle, Ƭᴇcʜιᴇ007, Moab, Sathya Apr 22 '11 at 12:33

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The core i5 is a pretty efficient processor, so the Radeons will be drawing most of the power. Pretty much any 500+ watt supply will do just fine. Just make sure it has two of the pcie power connectors for the video cards.

I have a core i5 2500K in an Asus P8P67 Pro with a Radeon HD 3850 and and it usually draws 130-240 watts ( idle-load ). I have a Corsair 550 watt supply and am not sure, but I think it did have the second pcie power connector for another video card.

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Alright, I'll check for 550 watts of power... Thanks a lot. You answered with experience though, so I'll check your answer :) –  sinni800 Apr 20 '11 at 19:36

You should have a play with this:

That should give you an idea of how much power you'll need - then you can buy the next most powerful power supply - best to be on the safe side...

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Oh wow, why didn't I find this on Google? Thanks, I'll check it out –  sinni800 Apr 20 '11 at 18:59
Okay, so it recommended 506 watts with a 20% wear. 550 watts should be safe? Should I go for 80plus or is a little lower effectiveness calculated there? –  sinni800 Apr 20 '11 at 19:05
@sinni800, You should go for as high efficiency as you can afford. The watts shown are DC; AC usage will be higher due to efficiency. I would advise getting one from a reputable brand, like Seasonic, Corsair, Silverstone, Antec, and there are others. –  Mircea Chirea Apr 20 '11 at 20:23
Sorry for answering late, but thanks a lot. I have one with 86% efficiency here, a ModXStream. Tests say it's pretty good overall, and it's cheap. –  sinni800 Apr 28 '11 at 15:34

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