Power Supply Help

rosserw

Junior Member
Jun 20, 2009
2
0
0
Hi there,
I'm building my first budget computer, and wanted some advice on an appropriate power supply. Cost isn't the most important consideration, but I'd like to get bang for my buck. Also, fitting in the case is pretty important. Here are the parts so far:

CPU: Intel Core 2 Duo E8400

GPU: Sapphire Radeon HD 4770 512MB 100277L

MoBo: GIGABYTE GA-EP43-UD3L LGA 775 Intel P43 ATX Intel Motherboard - Retail

Memory: 2x2GB 5-5-5 DDR2-1066

HDD: Western Digital Caviar Black WD6401AALS 640GB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive - OEM

DVDR: Sony Optiarc Model AD-7240S-OB 24X DVDRW SATA

Case (comes with 1 120mm fan): Cooler Master Elite 330 RC-330-KKN1-GP Mid Tower

Standard Keyboard, Mouse, 2.1 speakers, no extra hdd

I also have one of these, not sure whether it's compatible with the case I have

Fan: ARCTIC COOLING Freezer 7 Pro 92mm CPU Cooler - Retail

I ran some specs in a free power calculator online and came out with about 400 watts, though on reading the newegg reviews for my Motherboard it apparently requires at least 500 watts. I'd like to OC to some degree (this was the one part of the psu calculator I didn't know how to handle, particularly the Vcore number), and can buy another 120mm fan if it's worth the extra performance vs. the fan cost.

So, basically, how large of a power supply do I need, and does anyone have any tried-and-true models to recommend? Thanks much!
 

theAnimal

Diamond Member
Mar 18, 2003
3,828
23
76
Originally posted by: zerocool84
No way would this system draw 400W even at load. I went to Antec Calculator and it showed ~ 198W at 90% load. You could go somewhere in the 400-500W family and still have lot's of room to spare.

The 198W is the recommended PSU size so even 300W would be more than enough.
 

rosserw

Junior Member
Jun 20, 2009
2
0
0
Thanks. That puts me at ease. I imagine I'd have some overclocking leverage even with 300W then?
 

zerocool84

Lifer
Nov 11, 2004
36,041
472
126
Originally posted by: theAnimal
Originally posted by: zerocool84
No way would this system draw 400W even at load. I went to Antec Calculator and it showed ~ 198W at 90% load. You could go somewhere in the 400-500W family and still have lot's of room to spare.

The 198W is the recommended PSU size so even 300W would be more than enough.

This is just me but I kept it at around 50% more of his power needs which is why I recommended around 400W. Gives room for upgrades and overclocking.
 

Lunyone

Senior member
Oct 8, 2007
482
0
71
I'd recommend at least the Corsair 400cx PSU for $50 - $10 MIR = $40!! It comes with 30A on the 12v rail and has 1 PCI-e power connector, which is needed on the 4770 and on other lower/mid end GPU's. I think the Corsair 400cx or the Antec 380w is about as low as I'd go for most lower end setups. The Corsair right now is a bit cheaper than the Antec 380w one, so it gets the nod from me.

P.S. I'd consider getting a lower voltage RAM set over the one you selected (1.8v over your selection of 2.2v). You also won't need 1066mHz RAM for your system. Your generally going to be lucky to OC to 425-475 FSB, which is 850-950 mHz RAM speeds. The lower voltage will allow you more room for OC'ing and when at stock settings you'll run a bit cooler and consume less power too!!

This set is quite nice:
$55 shipped!!
G.SKILL PI Black 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model F2-6400CL4D-4GBPI-B - Retail