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PSU enough for HD 4850?

post #1 of 10
Thread Starter 
Hey guys wondering whether my SeaSonic S12 430w will cut it.
http://www.virtual-hideout.net/revie...seasonic07.jpg

It has 29A on the +12V rails.

The max power draw is 110W for the HD4850.
http://www.gpureview.com/Radeon-HD-4...-card-566.html

The review at Guru3d says it needs a 450w psu with 30A.

http://www.guru3d.com/article/amd-ati-radeon-hd-4850-review-force-3d--powercolor/7


Do you guys think my psu will be enough?

This is currently my system (excluding video card 8600GT).
E6750
P5N-E SLI
2GB DDR2 RAM
1 SATA HDD
1 IDE HDD
1 SATA DVD-RW
1 USB device
3x120mm case fans

I was initially thinking about getting the HD 4870 but that one is too much for my psu and requires two 6-pin power connectors, mine has one.
Edited by manny123 - 6/23/08 at 6:42am
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post #2 of 10
The 29a combined don't reflect the actual 12v+a, its usually under the total combined of a multi rail.
Sorry, I don't know the actual variant but I'd guess it probably about 25-26a.
That PS may handle your needs but it will likely be cutting it close.
    
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post #3 of 10
Based on what you have, it should be able to handle 4850 but pretty on the Edge.
Edited by linskingdom - 6/23/08 at 6:30am
post #4 of 10
Should be fine, I volt modded my GTS at one point and I used to run a cpu with 1.48v too and it was all fine.
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post #5 of 10
The S-12 430 has 29A combined. Like everyone said it is cutting it close but I would wager that it would be fine.
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post #6 of 10
Quote:
Originally Posted by shinji2k View Post
The S-12 430 has 29A combined. Like everyone said it is cutting it close but I would wager that it would be fine.
Not even close.

4850 peaks at ~110W, then something like 60W for CPU, rest about 50W is distributed quite evenly among all voltages.
post #7 of 10
Quote:
Originally Posted by EsaT View Post
Not even close.

4850 peaks at ~110W, then something like 60W for CPU, rest about 50W is distributed quite evenly among all voltages.
What do you mean by not even close? You are correct on your wattage estimates and the 50W for the rest would atleast be that much on the 12V since he has 2 HD which need about 20W at spin up plus a few fans. At stock he would be just fine a little room to spare. Since this is an overclocking forum, I tend to add a little more power consumption since ocing can easily increase power usage 50% especially with CPUs. Plus even at stock he will be stressing the 12V rail to about 65% which is the ideal level for efficiency and long term reliability. It's always better to be a little cautious than to over stress your psu.
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post #8 of 10
Quote:
Originally Posted by shinji2k View Post
2 HD which need about 20W at spin up plus a few fans.
Actually spin up draw of single HDD varies from 20 to 30W but after that 12V draw probably stays at quite constant level (12V is used by spindle motor) around 7-8W. Fans again use 1-4W per piece unless they're something extremely noisy.
Looks like 6750 is around 50W so peak load won't be going much above 200W at stock speed.

This result gives ~175W at full CPU load with 70W "idler" GPU.
Also Seasonic rates their PSUs very conservatively (pretty much underrates if you look reviews of HWsecrets) so as long as PSU isn't kept in oven I wouldn't see any problems in having 50% higher peak loads than what components in question cause at stock.
(you don't need half kW for running single card)
post #9 of 10
I ran my 8800GT on a 300w, with 3Ghz OC, you should do fine.
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post #10 of 10
Sorry, meant to say 20W each for spin up (worst case scenario for power consumption). Either way I think we agree that at stock he will be around 200W or so and if he does some OCing it will be higher (up to 275-300W depending on OC) but still not overloading it. Like I said, pushing it but still fine (if you OC, I guess I should of clarified that in my first post).

I do like how HardwareSecrets tries to find the max it can put out. Even though the Seasonic builds can usually go ~20% over rated specs and still perform well, it makes you question how long a PSU will last when it is stressed that much.
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