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Which power supply for new build using BFG 7900 GS OC

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January 23, 2007 1:51:13 AM

Hi

Well, I currently have

Gigabyte GA-965P-DS3
BFG GeForce 7900 GS OC PCI-E
Coolermaster CAC-T05 Centurion 5

I am going to put in either an E4300 or E6300 CPU.

I'm looking at getting a PSU, but am not sure what to go for. I went to the PSU calculator and can prob get away with a 400 W PSU.

BUT, the Geforce card needs 12V and 22Amps.

I have looked at two power supplies and they only go up to 18 amps.

http://www.newegg.com/Product/Product.asp?Item=N82E16817104954

http://www.newegg.com/Product/Product.asp?Item=N82E16817153023

Anybody have any ideas as to which PSU would suit the Geforce card needs?

Thanks

Great forum BTW :D 
January 23, 2007 2:13:25 AM

Can't comment on its quality, but that 1st one should run it looking at the specs.
January 23, 2007 2:39:07 AM

I'm pretty sure my friend is running an athlon 64 3700 and an 8800GTS on that thermaltake.

I'm sure it'd work fine if you opted for it.




-Cheese
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January 23, 2007 3:02:03 AM

Quote:
BTW the FSP offers a total of 29A on the combined +12v rails while the Thermaltake only has 18A of total power. Read PSU 101 to learn more and what you need to know to find a good PSU.


:D  I did read it. Just doesn't make sense to me. I know some of the manufacturers have the wattage split up over the rails - but I don't see that on the FSP here - so not sure how you did the calculation. But then again I am tired as well. Anyway, I believe you :) .
January 23, 2007 3:41:10 AM

Quote:
I'm pretty sure my friend is running an athlon 64 3700 and an 8800GTS on that thermaltake.

I'm sure it'd work fine if you opted for it.




-Cheese


I'm pretty sure your friend is having problems then.
January 23, 2007 3:42:48 AM

Quote:
BTW the FSP offers a total of 29A on the combined +12v rails while the Thermaltake only has 18A of total power. Read PSU 101 to learn more and what you need to know to find a good PSU.


:D  I did read it. Just doesn't make sense to me. I know some of the manufacturers have the wattage split up over the rails - but I don't see that on the FSP here - so not sure how you did the calculation. But then again I am tired as well. Anyway, I believe you :) .

Max wattage shown on the +12V rails ONLY (that is positive not to be confused with negative twelve volt rail)

It should be the wattage under those rails divided by twelve which equals amps.
January 23, 2007 4:14:48 AM

Okay I'm not gonna get all defensive, but I was there when we put the comp together. I KNOW that he owns a 430 low budget thermaltake.

And no from what I've heard he isn't having any problems.
Yes, maxing the graphics on some games could use more than 1 Gig of ram, but I was just at his place today and COH played with everything maxed at 1600*1200. He tells me Oblvion is playing well too.

Maybe the card hasn't been pushed far enough. Or maybe it's acyually working fine.

(I think it is)



-Cheese
January 23, 2007 3:34:25 PM

Quote:
If you look at teh pictures they have of the PSU there at newegg you will see the label on the PSU. Look at the line just above where it says "Caution:Hazordus area". It reads "(+12V1 & +12V2 = 348W)". So as you read in the Sticky you take that total wattage from the +12v rails and divide that by 12 to get the total amperage. That is where you find that the FSP offers 29A on the combined +12v rails. Hope that cleared things up.


8O You have excellent eyes...... I could barely make it out. But yeah, now it makes perfect sense. I couldn't find that split in Wattage - even the FSP site doesn't have it :?

Thanks
January 24, 2007 5:02:07 AM

That Thermaltake has 18A right?
The Minimum specs for 8800GTS (total system draw):
400W PSU rated at 26 Amps on the +12V rail

I suggest your friend buys a new power supply or a graphics card PSU so that he doesn't have problems :x
January 24, 2007 12:44:53 PM

Well, I have three I'm interested in - I'm future proofing a bit - in case I want a 8800 GTX :wink:

Enermax EG465P-VE FC 460W CAD $74.00 (has copper shielding)Enermax EG495P-VE Noisetaker 485W CAD $78.00
Thermaltake TR 2 W0090RU 470 W CAD $75.00

Personally I'm leaning towards the Enermax as they seem to be the better brand. But the choice is pretty tough between the two - which is better?

Also, is there any advantage in having more than one rail in 12V?

Thanks
!