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Doing the unthinkable.. GTX580 SLI on 650 watt PS. - Page 2

post #11 of 20
i bet you 25 cents it will shutdown if you play any gpu intensive game for more than an hour. That psu will only be capable of it's peak wattage for a limited time before it shuts itself off.

You'll be able to do it but i doubt that it'll be on for a long time

just my 2 cents
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post #12 of 20
These seasonic X series are underrated. It should be fine till the ~750w mark. So go ahead imo, especially since you will not oc.
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post #13 of 20
At stock, it will run fine if you're just gaming.
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post #14 of 20
nvm... i think it could do it as long as no oc is used... according to this http://www.hardwaresecrets.com/artic...y-Review/837/8

it is capable of functioning properly while pulling 943w AC and 793w from the psu before it starts working improperly.

Seems like there is no OCP for it either (which i didn't know) so it's not going to shut off until it's about to explode lol... it will ripple like nobodies business >793w instead of shutting off
Quote:
Before overloading a power supply we always like to see at what level its over current protection (OCP) circuit is configured. For this test we set +5 V and +3.3 V inputs from our load tester to pull only 1 A each and maxed out the two +12 V inputs for a total of 66 A. The power supply didn’t shut down, meaning that OCP is not present or is configured at a value above that. The manufacturer does not list OCP as a feature, so the first option seems to be the correct one
Quote:
You can see the maximum we could pull from this unit below. If we increased one amp from any output ripple and noise would go through the roof, showing that the unit stopped working correctly.
i take back my bet
Edited by badatgames18 - 7/27/11 at 3:01am
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post #15 of 20
Well if the Seasonic X-650 has no OCP (not entirely sure if this is true or not) then you'll have to rely on OPP, which is kinda useless in this situation anyway. Still, stock GTX 580's aren't going to overload a Seasonic X-650 under gaming load.
Edited by GameBoy - 7/27/11 at 3:08am
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post #16 of 20
I ran a stock clocked 5970 and a Phenom II 940 @ 3.6Ghz off of an Enermax 525w for 3 months.

Ran fine. I think it'll be fine with stock clocks.
    
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post #17 of 20
Quote:
Originally Posted by badatgames18 View Post
That psu will only be capable of it's peak wattage for a limited time before it shuts itself off.

You'll be able to do it but i doubt that it'll be on for a long time

just my 2 cents
All of the good power supplies claim sustained power output, not peak. I'd run my HX520 all day long at 520 watts if I needed to.
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post #18 of 20
A 500-550W PSU will pretty much handle any single card/single GPU config. I used to have a Seasonic 650W PSU (swapped when the warranty ran out) and replaced it with a 520 since 1. I will never have more than a single card config, 2. I will likely never find myself with such a more powerful card, and 3. I got my HX520 for $30, couldn't help myself
dual GPUs I guess it may depend on the CPU and its OC.

A 650W PSU will handle dual cards (I make it a rule of thumb that the TDP of each card is no higher than 175W or otherwise recommend a bigger PSU to be able to handle it - though again, it'd depend on the CPU). Being an X650 which is I believe a very high quality Seasonic build and 80+ Gold PSU it should perform like a 650-750W and may actually handle the two 580s quite fine. A single 580 consumes less power than a 470 right now I think. If I had no choice but to run that 650W with two 580s (i.e. high PSU prices) I would trust that PSU to be able to do it at least without blowing up (many of the PSUs I use/have used have Seasonic base designs )
Edited by xd_1771 - 7/27/11 at 3:22am
post #19 of 20
Thread Starter 
Just to update this, the cards are both installed, and I am pulling just under 600 watts under load from the wall, max wattage. Average around 550. This is under gaming, used bad company 2, crysis 2, heaven while measuring. Don't ask for any furmark cause it aint gonna happen! Heaven went from 55 fps to 100 with no tweaks. So for anyone else with a similar setup who is questioning their wattage, hope this helps. Cheers!
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post #20 of 20
Quote:
Originally Posted by djpheer View Post
Just to update this, the cards are both installed, and I am pulling just under 600 watts under load from the wall, max wattage. Average around 550. This is under gaming, used bad company 2, crysis 2, heaven while measuring. Don't ask for any furmark cause it aint gonna happen! Heaven went from 55 fps to 100 with no tweaks. So for anyone else with a similar setup who is questioning their wattage, hope this helps. Cheers!
This does help alot

thanks
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