Sign in with
Sign up | Sign in
Your question

What PSU I should buy?

Last response: in Components
Share
November 10, 2007 1:47:21 PM

Hello,

I am new in here.

I will buy a new computer:

- GeForce 8800 GTX (Will be slightly overclocked)
- Intel Q6600 (Will be overclocked to 3GHz)
- ASUS P5N32-E Plus
- Zalman CNPS9700 NT CPU Cooler
- Plus some random fans inside the case

What PSU should I buy, how many watts and what to look for?

The current case I have got a 600W PSU. Is this enough or should I buy a new?

More about : psu buy

a c 701 ) Power supply
November 10, 2007 2:27:57 PM

There are 600w PSU and 600w PSU. The important thing is what brand and the rating on the 12 volt rails!
Related resources
November 10, 2007 3:29:29 PM

Quote:
+3.3V
32A

+5V
40A

+12V
24A

-5V
0.5A

-12V
1.0A

+5V Standby
2.0A

Is those ok for:

- GeForce 8800 GTX (Will be slightly overclocked)
- Intel Q6600 (Will be overclocked to 3GHz)
- ASUS P5N32-E Plus
- Zalman CNPS9700 NT CPU Cooler
- Plus some random fans inside the case
November 10, 2007 4:26:25 PM

The quality of the power supply is very important, unfortunately it is one of the most overlooked and misunderstood requirements to a stable computer.

Power Supply Calculator
One of my favorite power supplies
To insure quality make sure the power supply is 80 PLUS Certified [the exact model, not simply a referenced model, some companies cheat]
November 10, 2007 4:42:15 PM

I forgot to mention, your power supply is too weak, you should have a total of 30 amps on the 12 volt rails, the power supply I suggested is rated for 41 amps continuous power on the 12 volt rails.
November 10, 2007 4:46:17 PM

Danra said:
I forgot to mention, your power supply is too weak, you should have a total of 30 amps on the 12 volt rails, the power supply I suggested is rated for 41 amps continuous power on the 12 volt rails.

How did you calculate that?

In your PSU I can see four time 18A which equals to 72 amps and not 41?
a c 701 ) Power supply
November 10, 2007 4:49:14 PM

24amps on the 12volt line is low for a GTX. I would suggest upgrading to a
Quality PSU with minimum 30amps on the combined 12 volt rails. Corsair and PC Power and Cooling are two brand names that are highly recommended.
a c 243 ) Power supply
November 10, 2007 4:49:56 PM

kaisellgren said:
Quote:
+3.3V
32A

+5V
40A

+12V
24A

-5V
0.5A

-12V
1.0A

+5V Standby
2.0A

Is those ok for:

- GeForce 8800 GTX (Will be slightly overclocked)
- Intel Q6600 (Will be overclocked to 3GHz)
- ASUS P5N32-E Plus
- Zalman CNPS9700 NT CPU Cooler
- Plus some random fans inside the case


You're showing a single 24 amp +12v rail, it's not enough. The minimum psu reccomendation for an 8800 GTX equipped system as per EVGA is 26 amps, adding an overclocked Quad to the mix increases the load.
If you have no plans on going SLI a psu in the 30-35 amp range would do.
Here's a 450w\33amp model that would be fine
http://www.buy.com/retail/product.asp?sku=205466485&Sea...


Geez I'm slow
November 10, 2007 5:01:34 PM

kaisellgren,

You cannot add the rails together to find max continuous amps. Each rail has a max amperage for that rail, however, total amps for all of the combined rails is actually less, 41 amps in this case. Look at this image, under 12 volts you have four rails with an 18 amp rating each, below that you will see the rating for all of the amps combined on the 12 volt rails, 41 amps
November 11, 2007 11:18:16 AM

Okay I got that :) 

How about those +3.3V and +5V what are they used for? If I need to look for something like 35A max for my 8800 gtx and quad core based computer, what should those smaller voltages have in amps?

EDIT:

I found this could be a good I can buy this from local stores for cheap: CMPSU-550VXEU
details: http://www.lan-shop.cz/zdroje-do-pc-skrini/corsair/5039...
a c 243 ) Power supply
November 11, 2007 11:32:11 AM

That will work.
a c 701 ) Power supply
November 11, 2007 12:32:54 PM

excellent choise
!