View Full Version : Can my power supply handle 5 case fans? Your thoughts

11-08-04, 09:47 AM
I just got my new rig which has a 420W power supply and the case I have has spots for 4 case fans which I have all installed. Alll 80 mm. I am thinking of putting one more in the pci slot area, I took all the pci steel slot pieces out and want to mount another fan there. I only have one hard drive, my 6800gt, and a cdrw installed now. I think I have one or two more 4pin molex connectors left.

Another quick question, I have overclocked my P4-3.4 ghz Prescott to 3.6, I am new to this so I am going slow. Everything works great, I havent had to adjust memory timings or anything and since I overclocked the pc, I havent had a problem. My question is about cpu temps. I didnt check my temps before overclocking but afterward my cpu temp idle hovers around 52-54C, under load after 2-3 hours of Doom 3 the highest I saw the temp was 63C. I wondered if this was a little high so I set the cpu back to normal and the next day let it idle for hours, the temp was still the same at rest. So I assume from this that my overclocking wasnt really changing the cpu temp much if at all. I have heard the Prescott chip runs hotter than other chips anyways.

Well please give me your thoughts on this and if maybe I should try to overclock maybe a bit more, Thanks

NZXT Guardian case
Foxxconn motherboard
3.4 ghz @ 3.6
1024mb Pc3200 ram
BFG 6800GT OC 391/1000

11-08-04, 11:22 AM
How many devices are going to be running off it? I see your CPU, Ram and VC but no HD's listed, CDROM or any other PCI devices... I know my 420 was able to handle my rig untill I got the 6800GT, mind you I also have 5 HD's, an Ethernet Adapter and a CDROM Drive. Had to upgrade to 530w PSU then...

11-08-04, 12:54 PM
I did mention the HD, but anyways...I only have HD, one cdrw drive, 6800gt and 4 case fans so far. No pci cards, no floppy drive. Oh, a little blue neon light at the bottom of the case thats also connected. Thats about all I can think of off the top of my head.

11-08-04, 01:13 PM
Fans take a fraction of power you might aswell have 10 of them ! unleass your PSU is especially week or something ?

11-08-04, 02:54 PM
I feel that it may support them, but you'd be hard pressed to find enough area on a typical psu to mount them without drilling into some sensitive electronics.

11-08-04, 03:00 PM
My panaflo 80mm fans are rated at .1 amps on the 12v rail. Adding four of those would only add a half amp to the 12v rail so they should be fine. As for other fans I think my really loud high cfm thermatake smart fan pulls .18-.45 amps so you do the math. You will be okay. However you forgot the most important part of the question. (what brand of power supply is your 420 w one)

11-09-04, 12:02 AM
Fans use a very small amount of power.. HD's, high end CPU's, high end video cards, are the things that use oodles of power :)

11-09-04, 06:35 AM
how many amps on the 12v rail does the PSU give out? Anything less than 20amps on the 12v rail, i'd start looking into another PSU, especially w/that 6800GT that you got in your system.

11-10-04, 03:36 PM
Thanks for the replies, PSU seems to be handling everything fine. What about my other comments on the cpu temps and if I should try for some further overclocking, remembering I am no expert at this and dont want to have to fiddle with changing voltages and such. Any advice would be greatly appreciated, thanks.

11-10-04, 10:43 PM
I have a 430W Antec power supply with 2 hard drives, dvd cdrw burner, cd/dvd drive, Soundblaster Audigy 2 ZS, 6800 GT oc to 390/1100 and 3 extra fans (120mm in front pulling air in, 80mm on side pulling air in blowing on vid card and ram, 92mm on back sucking air out) all running fine.
My P4 3.06 (non oc) idles at roughly 35C and under load I have seen it get as high as 55.

11-11-04, 02:04 PM

google rules..

11-11-04, 02:50 PM
Checked that site and it says the recommended power supply for me is 380w.

11-11-04, 03:11 PM
Fans take no power at all 2-3watts max, dont worrie about em!