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PSU power calculation

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May 23, 2007 4:25:03 PM

hi,
i used Extreme power supply calculator lite 2.5 for this rig:
E6420 (90% TDP)
XFX 8800GTS 320 XXX
1024X2 OCZ 800Mhz
WD 250G
LG DVD/rw
3 120mm fans

i got 283W. can it be?

please hurry, i'm buying this pc 2morrow morning. thanks...

More about : psu power calculation

May 23, 2007 5:30:24 PM

Yes it is true, however the minimum power requirement would be a 400w or greater since you want +12v@22A combined minimum for your rig and recommend a 450w or better which would work out to +12v@26A combined.
May 23, 2007 5:54:06 PM

yap i know.
it just that i'm buying tomorrow this rig for a friend, & didn't know if i need to buy a special PSU. with the cheap case i get a 500W 4+4 pin PSU.
@ 85% efficiancy i get 435W truepower. i wanted to know if it's enugh... & if the calculation is right, than it is.
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May 23, 2007 6:13:28 PM

i was wrong. how can i show here an image of the PSU table?

at voltage 230v~ @ +12V i got 18A, 216W.
at current 5A i got @ +12V 1.0A and blank at W...

max output 500W, true 422W...

it's not enugh right?????

the 283W by the extreme calcolator is for the +12A only, right???

Edit:
is this PSU good for me?
http://www.thermaltake.com/product/power/TR2power/w0101...
( i cannot understand Tt tables... the Enermax much understandble...)

& this:
http://www.enermax.com/english/product_Display1.asp?PrI...
can i overclock with it? or i'll need the 485W ver for that? (32A Vs. 29 A, 30$ more!)

thanks!
May 23, 2007 7:43:16 PM

for the +12v calc, I usually choose cpu/gpu/hdd/dvd/2 fans (or devices that load up the +12v only, memory / system board loads up the +3.3v / +5v rails). So...

Quote:
eXtreme PSU calc"]System Type: Single Processor
Motherboard: Regular - Desktop
CPU: Intel Core 2 Duo E6420 2130 MHz Conroe
CPU Utilization (TDP): 90% TDP

Video Card: NVIDIA GeForce 8800 GTS 320MB
Video Type: Single Card

SATA HDD: 1 HDD

DVD-ROM Drive: 1 Drive

Fans
Regular: 1 Fan 80mm; 1 Fan 120mm;

Keyboard and mouse: Yes

System Load: 100 %


Recommended Wattage: 253 Watts
[/url]
But, don't forget to subtract the "no load" system board wattage of 38w
253-38=215w or 17.9A at most on the +12v rails combined.

Pad that at the 80% mark, you want minimum +12v@22.4A on your PSU.

The truepower 430w should handle that w/o an issue if you can get it cheap. Go w/ a 500+ unit if you have the budget, they usually handle +12v@35A or so - then upgrades and longevity are part of the consideration.
May 23, 2007 11:11:03 PM

Quote:
500W 4+4 pin PSU. @ 85% efficiancy i get 435W truepower

500W PSU @ 85% efficiency is 500W true power, but takes 575W from your wall outlet
May 24, 2007 12:44:01 AM

I thought he meant an Antec Truepower :oops: 
May 25, 2007 6:20:35 AM

Quote:

is this PSU good for me?
http://www.thermaltake.com/product/power/TR2power/w0101...
( i cannot understand Tt tables... the Enermax much understandble...)

& this:
http://www.enermax.com/english/product_Display1.asp?PrI...
can i overclock with it? or i'll need the 485W ver for that? (32A Vs. 29 A, 30$ more!)

thanks!

Yes the enermax 485w would be a good choice, you have some room left over for OCing. The 420w would be good otherwise.
I would definitely go for the 485W, the 420W is cutting it a little close at 29A.
!