PSU and amper pairs is there a site?

Not that Im aware of. do you have a particular question? There are SOOOO many PSU's out there, how could you match them up with each video card. There are SOOOO many video cards out there to. It would be a huge matrix of models.
 


Yes, there is. But... I can't remember where I saw it recently.

If you are shopping for a PSU, find out what your graphics card/s require for wattage/amps/power-connectors and use that as you primary sizing filter.

Then look at a tiered list of quality vendors, such as this:
http://www.overclock.net/power-supplies/154057-jonnyguru-power-supply-buyers-guide-updated.html

or this:
http://www.eggxpert.com/forums/thread/323050.aspx
 
Or you can just post your system w/ video card and we can help you select.

It is hard because some vendor don't sell in certain countries and there are alot of international threads on here. The minimum requirements are also based off an average system and there are some exceptions that come up.
 

ErnTrader

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I have a good CORSAIR HX620 which is more than enough for my system, even if I want to double my Videocard...

But I usually help others upgrading their old PC and need to know these...
I speaking about really old PCs like an AGP using motherboard with single core CPU and a Radeon 9600 Card... (If I want to put a HD2600XT in it what PSU should do it without extra cost ... The old one still capable or not...)

One years ago, I found here a list, but it disappeared. They sum up the videocards and made groups like...

7600 GT/7800GT... xxA-xxA (Example 21-25A)
X1900XTX/8800GTX 29A-33A (Minimum-Recommended)

http://whirlpool.net.au/wiki/?tag=PSU_Recommendations

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