PSU power calculation

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...
8 answers Last reply
More about power calculation
  1. 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.
  2. 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.
  3. 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/w0101102/w0101102.asp
    ( i cannot understand Tt tables... the Enermax much understandble...)

    & this:
    http://www.enermax.com/english/product_Display1.asp?PrID=20
    can i overclock with it? or i'll need the 485W ver for that? (32A Vs. 29 A, 30$ more!)

    thanks!
  4. 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...

    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
    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.
  5. Quote:

    is this PSU good for me?
    http://www.thermaltake.com/product/power/TR2power/w0101102/w0101102.asp
    ( i cannot understand Tt tables... the Enermax much understandble...)

    & this:
    http://www.enermax.com/english/product_Display1.asp?PrID=20
    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.
  6. 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
  7. I thought he meant an Antec Truepower :oops:
  8. Quote:

    is this PSU good for me?
    http://www.thermaltake.com/product/power/TR2power/w0101102/w0101102.asp
    ( i cannot understand Tt tables... the Enermax much understandble...)

    & this:
    http://www.enermax.com/english/product_Display1.asp?PrID=20
    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.
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