ok, when you look at for example PSU requirments for lets say an ATI Radeon™ X1950PRO 512MB AGP. it says;


''450-Watt power supply or greater, 30 Amps on 12 volt rail recommended (assumes fully loaded system)''


right, ok then.

i have a Coolermaster iGreen 500W PSU ATX Form Factor 12V V2.2 / SSI standard EPS 12V V2.91.

PSU

there is a picture on the above link of the side panel for this psu.

please tell me what is my psu amps of the 12v please and how you worked that out!!!!!!!!!!!!!


after researching is it 33A or 58A, please help

OK, it says it has 396 watts on the 12 volt rails. Thats the 2 12 volt rails combined. Each rail outputs up to 19.5 amps per rail. If you add them together thats 39 amps...BUT, thats not how it works. The 19.5 is MAX per 12 volt rail, but using both, thats 396 watts MAX for the 12 volt system/rail. OK, now when we want amps, we go, V x A = W, or volts times Amps equals watts. You have 396 on your 12 volt for both rails, or 396 divided by 12 = 33 amps. So you have 33 amps for your 12 volt, which by the way is plenty for your gpu, with a lil overhead for ocing or raid, watercooling etc.. Got it?

thank you so its 33amps.

but the 396W is for the three 12V rails right (+12V1, +12V 2, +12V 3), so why did you ingnore the third rail?

just for future upgrade, so i assume this psu is even fine for a 8800 ultra ''psu requirment: A minimum 400W system power supply (with 12V current rating of 30A)''?

ps. i acually have a pci-e slot and will soon get the 8800 gts 640mb (currently i have radeon 1600pro). the agp card was just an example.

396 watts is the total 12 volt watts available no matter haw many 12v rails you have, whether you have 1,2,3,or 4 12v rails. The 19.5amps is just a fused limit on that individual rail.

hey guys can i get some help as well...heres my specs
mobo - intel 946gz
processor - intel pentium d 3.4ghz
gfx - PowerColor ATI x1950
ram - 1gb dd2 533 -GENERIC
power supply - dynamo 600w 24pin sata

the problem is, when i play oblivion or any games for that...my pc shuts down!!!what's wrong?some guys here told me that my power supply might not be able to hold up 30a for the processor/gfx card...pls help, guys heres whats written on my power supply, pls help me out whether my power supply only has 22v or something or something else is wrong w/ my pc... *still hoping*

input 115v -10a 60hz 230v -5.5a 50hz
output 600 +5v +12v -5v -12v +3.3v +5vsb
watts 50a 22a .5a .8a 28a 3a

Well purely from the info you gave us, it does say 22A, not 30A. I cant find any decent info on that psu yet, I'll have to keep looking.

By using this PSU calculator you need at least 22 to 23 amp on the 12v rail at a minimum.
http://web.aanet.com.au/SnooP/psucalc.php
You would need something in the 450~550watt range built by a quality company like Seasonic,Corsair,or Silverstone with around 30amps or 360watts on the 12v rail to be on the safe side. How much can you spend?
What is the UL number on the PS? It will tell you who actually manufactures it.

Get this baby:

http://www.newegg.com/Product/Prod [...] 6817104954

ok, what good power supply would u recommend for $50?!tried that psu calc and it says i need atleast 25amps on a decent psu / 31am on a generic...

I recommend the one I linked above, its close to $60, but its got the power you need, 29A in fact.