Is my PSU up to the job?

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22 Nov 2005
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Many apologies if this question isn't relevant to this section of the forum, but I've noticed a fair bit of chatter about PSUs here so I figured this would be the best place. I'm nervous that my PSU isn't up to the job on the setup that I have, and that I'm facing impending doom, leading to catastrophic meltdown which might start a fire and burn my house down.

Or something.

Anyway, I have a Tagan TG480-U01 480W PSU and I run the following setup:

DFI LanParty NF4 Ultra-D
Athlon64 3200+ 90nm Venice (@ 2500mhz/1.52V 28*C/43*C idle/load)
4x512MB Kingston PC3200 KVR400X64C3A/512 (@ 208mhz 3-3-3-7)
1x 80GB Maxtor DiamondMax Plus9 IDE 6Y080P0 (OS and swap file)
1 x 250G Maxtor Maxline III SATA 7L250S0 (music, pr0n and games)
ASUS DVD-E616A 16x DVD ROM
1 x BFG Tech GeForce 7800GT 256 OC (@ 465/1130mhz)
Soundblaster Audigy 24-bit sound card

I also have a Zalman CNPS9500-LED Aero Flower, a Zalman VF700-CU Quiet Copper VGA Cooler (plugged into the 12V line), an 80mm Antec variable speed fan (plugged into the FAN2 socket on my motherboard) and a 120mm Antec fan drawing air out of the back of my case (again, on the 12V line). Each variable speed fan runs anywhere from 25%-75% but never at full pelt.

So far (touch wood) I haven't had a single problem with my system which is Prime95 (24hours) and S&M (including the PSU test) stable. I also play Half Life 2 and Everquest2 for very extended periods of time (anywhere from 2-6 hours at a time) and again no problems.

I often have a feel at the exhaust air coming out the back of my case and while the air coming out of the PSU is warm, it's not roasting. However, I don't know if that means anything.

Could someone advise if this PSU's up to the job or should I be looking at something else? If so, what's the favourite PSU of choice? I've no intention of ever going SLi so that's not a consideration.
 
Your rig will use about 250W maximum and the PSU you have has strong 12V rail(s) so it'll be fine.

The air coming out of a PSU is always warm/hot, it is because a PSU is about 70% - 80% effective meaning that when your system needs 250W the PSU will be pulling 357W max from the socket, the 107W extra will become heat and needs to be exhausted out the back of the PSU
 
Ah, I can relax then. Many thanks for that. How were you able to estimate how much power I'd be pulling? Is it complicated to calculate? Being a mechanical engineer, my most in-depth knowledge stretches to somewhere between 3-phase sockets and DC motors and that's about it. I'd like to be able to estimate things like that myself. Is it complicated?
 
xibxang said:
Ah, I can relax then. Many thanks for that. How were you able to estimate how much power I'd be pulling? Is it complicated to calculate? Being a mechanical engineer, my most in-depth knowledge stretches to somewhere between 3-phase sockets and DC motors and that's about it. I'd like to be able to estimate things like that myself. Is it complicated?
There are PSU calculators but they are a bit unrealistic, there is one here

The more realistic power usage I get from reviews where they used a Watt meter they put between the kettle lead and the socket.
 
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