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What PSU I should buy?

Forum CPU & Components : Power Supplies, PC Cases & Case Mods - What PSU I should buy?

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kaisellgren   11-10-2007 at 04:47:21 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?

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itotallybelieveyou   11-10-2007 at 04:56:41 PM
- 0 +

it should be enough

------------------------------ It's a theater of love stories.
 Reply to itotallybelieveyou
rolli59   11-10-2007 at 05:27:57 PM
- 0 +

There are 600w PSU and 600w PSU. The important thing is what brand and the rating on the 12 volt rails!

Reply to rolli59
kaisellgren   11-10-2007 at 06:29:29 PM
- 0 +

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

Message quoted 1 times
Reply to kaisellgren
Danra   11-10-2007 at 07:26:25 PM
- 0 +

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]

------------------------------ Intel E4400 @ 3.45GHz, ATI X1950 XT, Windows XP
 Reply to Danra
Danra   11-10-2007 at 07:42:15 PM
- 0 +

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.

Message quoted 1 times
------------------------------ Intel E4400 @ 3.45GHz, ATI X1950 XT, Windows XP
 Reply to Danra
kaisellgren   11-10-2007 at 07:46:17 PM
- 0 +

Danra wrote :

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?

Reply to kaisellgren
rolli59   11-10-2007 at 07:49:14 PM
- 0 +

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.

Reply to rolli59
Bronze CPUs badge Delluser1   11-10-2007 at 07:49:56 PM
- 0 +

kaisellgren wrote :

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. [...] caid=15890


Geez I'm slow


Message edited by Delluser1 on 11-10-2007 at 07:50:40 PM
------------------------------ q9650 @ 4.050 | Asus Rampage Formula | 2x2 Corsair Dominators | WD Black 640 x2
EVGA GTX260 Core216 @ 686/1479/1103 | Antec TPN 750

 

Reply to Delluser1

Danra   11-10-2007 at 08:01:34 PM
- 0 +

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 http://images10.newegg.com/NeweggImage/productimage/17-151-027-07.jpg

------------------------------ Intel E4400 @ 3.45GHz, ATI X1950 XT, Windows XP
 Reply to Danra
kaisellgren   11-11-2007 at 02:18:16 PM
- 0 +

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-p [...] sair/50394


Message edited by kaisellgren on 11-11-2007 at 02:24:13 PM
Reply to kaisellgren
Bronze CPUs badge Delluser1   11-11-2007 at 02:32:11 PM
- 0 +

That will work.

------------------------------ q9650 @ 4.050 | Asus Rampage Formula | 2x2 Corsair Dominators | WD Black 640 x2
EVGA GTX260 Core216 @ 686/1479/1103 | Antec TPN 750

 

Reply to Delluser1

rolli59   11-11-2007 at 03:32:54 PM
- 0 +

excellent choise

Reply to rolli59
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