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i would like to know if my psu can support a gtx 580 - Page 3

post #21 of 41
Thread Starter 
thanks really helpfull wink.gif
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post #22 of 41
Thread Starter 
sorry but i like to understand every thing...

the other components the sata's, ram's, fan's, wireless card, make no difference?

in the eXtreme Power Supply Calculator Pro if cpu utilization and system load are at 100% they say a i need 743w ?!?
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post #23 of 41
Quote:
Originally Posted by phileps View Post

thanks
i was wondering if i would be better with a gtx 590 or an hd6990 but then i real need a new psu right?
and i dont know if the cost difference really goes with the performance difference
also i've been told that 2 gpu graphics have some heat problems and dont go well with many games is it true?

650w is fine even for a gtx 590/6990. A good 650w like the one you like, can handle any 'single' gpu set up.... but if you were to SLI the 580s, you would need a 850w psu.
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MCC
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post #24 of 41
Quote:
Originally Posted by phileps View Post

thank you
i just cant understand the numbers .... why a psu with 650w can handle a card that needs a minimum of 700w...

Its the manufacture's way to save their A$$ from lawsuits.

when they say 700w minimum its is used to cover for the newbies that will go out and buy a generic 700w psu and run it with their gtx 580. The generic 700w psu if lucky actually has 450w on their 12v rail, which can run a non OC system. Basically to run a non OC gtx 580 all you really need is 450w on 12V rail. Imagine if MSI recommends 450w minimum psu, some newbie for sure... guaranteed will buy this GTX 580 and a generic 450w psu, and then it ruins their computer. Uh oh ... i can see MSI or any other Nvidia companies will get into a lot of trouble, as their box only states what the minimum, but not exact which model to get.

But in reality a full OC system only requires <550w on the 12V railing. I once ran a GTX 580 OC and i5-2500k OC on a 620w psu no problems at all, I could of ran it perfectly fine on a 550w psu if I wanted to.

But yes grab a 650w psu so you get more headroom.
Edited by mcc21 - 12/9/11 at 8:58am
MCC
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MCC
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post #25 of 41
Quote:
Originally Posted by phileps View Post

sorry but i like to understand every thing...
the other components the sata's, ram's, fan's, wireless card, make no difference?
in the eXtreme Power Supply Calculator Pro if cpu utilization and system load are at 100% they say a i need 743w ?!?

they over estimate a bit to give newbies some headroom, and unless you plan to fold 24/7 you will never hit 100% cpu/gpu load.
MCC
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Samsung 840 120 gb SSD Samsung Noctua NH-D14 Windows 7 Ultimate 
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Samsung SyncMaster S27A850D  CM Storm Quick Fire  Corsair AX850 Fractal Design Define R4 
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MCC
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post #26 of 41
A GTX 580 and an i7 should pull at max 500w. You're power supply runs at ~87% efficiency and can theoretically supply more than 650w but at 100% load the efficiency drops below the required efficiency to be labeled gold certified. If you're pulling 500w from the wall your psu is using 450watts, again well with your limits on that psu.

Nonetheless you'll be fine with that power supply. If we were talking about some no-name 650w no one would be so confident.
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post #27 of 41
Thread Starter 
thank you thumb.gif
phantom
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post #28 of 41
Quote:
Originally Posted by phileps View Post

sorry but i like to understand every thing...
the other components the sata's, ram's, fan's, wireless card, make no difference?

RAM uses around 2-3W per stick, fans about the same(unless we're talking about very high RPM industrial fans which can even go to well above 100W per fan, but they cost as much as a high end GPU and make more noise than a fighter jet at takeoff wink.gif), a HDD draws about 8-10W in seek mode, so unless you're building a file server or a dedicated torrent rig, HDD power draw is no concern.. and a wireless card will not pull more than 5W in any circumstance(unless it's a 500$ professional solution).
Quote:
Originally Posted by phileps View Post

in the eXtreme Power Supply Calculator Pro if cpu utilization and system load are at 100% they say a i need 743w ?!?
Online calculators are trash, don't bother with them.

Here's what your system will draw under full load(not a very common occurrence unless you're folding)

Nehalem ~150W <4Ghz
GTX 580 ~300W @ 0.9Ghz
everything else ~50W

At full system load your PSU still isn't seeing 80% load wink.gif
post #29 of 41
Thread Starter 
ok thank you very much

5 of my fans are 1300rpm a 1 is 800 rpm

and the wireless card cost was like 30$
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post #30 of 41
Quote:
Originally Posted by phileps View Post

ok thank you very much
5 of my fans are 1300rpm a 1 is 800 rpm
and the wireless card cost was like 30$

Those are below 5W fans smile.gif
Same for the wireless card, not worth factoring in since its power requirements are negligible smile.gif
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