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post #11 of 25
Easily enough, if we're not trying for world record overclocks and it's a *quality* 500w PSU.

http://www.tomshardware.com/reviews/radeon-hd-5770,2446-15.html

324 watts, for the whole system, from the wall, with a stock i5 750 Lynnfield. An x58 system uses about 30 watts more than a Lynnfield, plus your overclock, and you may approach 400 watts from the wall. Factor in PSU efficiency, and we're looking at ~350 from the PSU itself. ..Right?

For all you naysayers, 2 5770s use less power than 1 GTX 480. And 500 watts is definitely enough for an i7 + 1 GTX 480.
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post #12 of 25
Quote:
Originally Posted by pursuinginsanity View Post
Easily enough, if we're not trying for world record overclocks and it's a *quality* 500w PSU.

http://www.tomshardware.com/reviews/...0,2446-15.html

324 watts, for the whole system, from the wall, with a stock i5 750 Lynnfield. An x58 system uses about 30 watts more than a Lynnfield, plus your overclock, and you may approach 400 watts from the wall. Factor in PSU efficiency, and we're looking at ~350 from the PSU itself. ..Right?

For all you naysayers, 2 5770s use less power than 1 GTX 480. And 500 watts is definitely enough for an i7 + 1 GTX 480.
watts pulled from the wall plug is not the same as watts being used by the system. your talking 324W on 120 AC Volts @ 60Hz, not 12/5/3.3 DC volts. when a psu converts voltages it also changes the wattage....
post #13 of 25
Quote:
Originally Posted by Nemesis158 View Post
watts pulled from the wall plug is not the same as watts being used by the system. your talking 324W on 120 AC Volts @ 60Hz, not 12/5/3.3 DC volts. when a psu converts voltages it also changes the wattage....
HERE I WOULD LIKE TO SAY SOMETHING...IN SUCH CASES PSU EFFICIENCY KICKS IN....

if the psu is 80+ rated then it means that if it takes 100 watt from wall it will at least provide 80 watts(converted) power to the system components...so theres no way that any system will be pulling more than what is shown at the wall......

even for non 80+ psu..they too provide their rate wattage unlike some ppl think...but the conversion factor is so bad that they take hell lot of wattage from socket to deliever the correct rated wattage hence higher electricity bills...........

and most quality 80+ psu's r underrated...they can provide quite a bit more than what they r rated for but at the expense of efficiency.........
Edited by ghost_z - 4/29/11 at 11:16pm
post #14 of 25
Thread Starter 
Thanks for the help guys, +rep to you all.

But onto the topic, would it be safer just to pull my i7 back to stock clocks? I have used the PSU calculator and it tells me its fine, but what I'm worrying about is the amps available on the +12V.
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post #15 of 25
i just don't know what a lot of the people on this forum are smoking, because 500w is more than overkill for 2 5770s and a i7 i mean 1 of those cards uses like 150w, and the cpu uses around 100 to 150w the rest of the system uses so much less that it is not worth mentioning, a 450w psu is enough for 560 ti sli setup WITH overclocking and the 5770 is slightly less powerful than a 550 ti
post #16 of 25
You'll be just fine with that PSU, and your rig with 2x 5770's. Even with overclocks.
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post #17 of 25
Quote:
Originally Posted by Nemesis158 View Post
watts pulled from the wall plug is not the same as watts being used by the system. your talking 324W on 120 AC Volts @ 60Hz, not 12/5/3.3 DC volts. when a psu converts voltages it also changes the wattage....
Way to miss the point, bro.
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post #18 of 25
Quote:
Originally Posted by pursuinginsanity View Post
Way to miss the point, bro.
i was tired and confused myself about watts/amps.......
post #19 of 25
Quote:
Originally Posted by Nemesis158 View Post
i was tired and confused myself about watts/amps.......
Fair enough.

I was only saying ~ it can't put out more power than it's drawing from the wall, and by the time you take efficiency into account, it's putting out less than 300 watts for crossfire 5770s.
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Why upgrade?
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Why overclock?!
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Core i5 760 ASUS 55i Sabertooth EVGA 960 4GB 8gb 1600mhz Vengeance 
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post #20 of 25
I'd be careful if I were you. The last thing you want is to run a situation where you risk frying both of those nice 5770s and possibly whatever else. Though it is never happened to me from underpowering a system, I have had components go bad on me and it's not cool, so whatever you can do within reason to minimize risk, is probably worthwhile.

Another great PSU calculator is here . It lets you account for power draws that you might not have thought of before (LED fans, PCI cards, USB devices, etc.,overclocking, and more). I got a lifetime/pro version a couple years ago and it seems very worthwhile, fwiw.
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