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PSU vs gtx570

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April 17, 2011 1:26:20 AM

hi, im currently planning my new system and im wondering if i should keep my current PSU. Its a 3 year old enermax 850w galaxy (egx850ewl) and i want it to power a gtx570 with a i5 2500k on a p8p67 deluxe. According to EVGA, the power requirement for the gtx570 seems to be "550 watt or greater power supply with a minimum of 38 amps on the +12 volt rail". I currently have 5 x 12v rails, with 24a on each of em. Im a bit lost when it comes to single vs multi rails. Since i only have 24a per rail, should i conclude that its not enough and that id need a big single rail psu like the corsair AX850? what dyou guys think?

thk you

current psu :


psu full spec :
http://www.jonnyguru.com/modules.php?name=NDReviews&op=...

ps: i also would like to add another gtx570 eventually. and have some headroom to add more stuff if needed.

the psu will have to power :
i5 2500k oc
p8p67 deluxe
2x4gb ddr3 1600
gtx 570 (maybe sli down the road)
SB X-fi pci-e
4 sata HDD
1 dvd-drive
1 SSD
8 fans
+ usual stuff

More about : psu gtx570

a c 148 ) Power supply
April 17, 2011 2:25:24 PM

You're cool as is
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April 17, 2011 2:28:44 PM

am i right to assume that since w = v*a, a total system power consumption of 446w under furmark (according to the link above) divided by 12v would give 37.17a, exactly what EVGA requires. According to http://www.techpowerup.com/reviews/ASUS/GeForce_GTX_570..., the card itself could use up to 298w, (24.9a), more than a single rail on my psu can supply.
am i completely wrong with those? how can i make sure that the system is balanced over all 5 rails. does it do it automatically?
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April 17, 2011 2:33:42 PM

is that why every recent psu i see now (except enermax) are single rail?
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a c 91 ) Power supply
April 17, 2011 6:03:16 PM

Forget about the rails.. An 850W PSU will have a maximum amp rating of about 70 amps.. So, a single GTX 570 rig requiring about 38A is in check.. And even when you add another GTX 570 in there, the total required current won't cross 60A (even considering a highly overclocked CPU).. So you are fine provided your PSU can actually deliver on the advertised voltage/amps..
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a c 716 ) Power supply
April 17, 2011 7:37:17 PM

Vince999 said:
am i right to assume that since w = v*a, a total system power consumption of 446w under furmark (according to the link above) divided by 12v would give 37.17a, exactly what EVGA requires. According to http://www.techpowerup.com/reviews/ASUS/GeForce_GTX_570..., the card itself could use up to 298w, (24.9a), more than a single rail on my psu can supply.
am i completely wrong with those? how can i make sure that the system is balanced over all 5 rails. does it do it automatically?

Do not look at the max, done with Furmark, it does not represent anything that happens in normal use peak in use is 190watts!
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April 17, 2011 7:39:38 PM

thank you very much
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April 17, 2011 7:53:49 PM

Best answer selected by Vince999.
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