What is minimum Amp on +12 V rail required to run ATI Radeon HD4550

[iliani007]

I wonna buy hd4550 and i have 275W PSU
17A on 12V rails i have seen guru3d that is recommended 20A but i have only 17A


GURU 3d
http://www.guru3d.com/article/ati-radeon-hd-4550-512mb-review/4


My specs
Intel pentium D 3.00GHz
2.5 GB RAM ddr2 SDRAM
80GB HDD SATA 7200rpm
DVD ROM 5V 1.5A

PSU:
http://www.google.com/imgres?start=180&um=1&hl=en&sa=N&biw=1280&bih=923&tbm=isch&tbnid=hMVs8VtvDvm8oM:&imgrefurl=http://www.ebay.com/itm/Dell-275W-Power-Supply-Optiplex-GX620-SFF-N275P-00-NPS-275BB-B-/320852219321&docid=951oDbvhNLsRyM&itg=1&imgurl=http://ebaypictures.net/pictures/8443_oexh49clsvts.jpg&w=3798&h=2062&ei=HJuvT5yjAs_JswbNmMzMBg&zoom=1&iact=hc&vpx=736&vpy=439&dur=6350&hovh=165&hovw=305&tx=193&ty=143&sig=109446939691864855028&page=8&tbnh=120&tbnw=221&ndsp=25&ved=1t:429,r:43,s:180,i:44

Can i run this video card even in full load?

 

[iliani007]

i can't because my pci-e 16x 2.0 is only 25W max no 75W

 

[iliani007]

All PCI-E can deliver 75 watt of power and the HD6570 is actually as power conservative as the HD4550.........

Yes i know but my pc is a dell optiplex gx620 smalll form factory and i have seen the documentation and there is only 25W from PCI-E 16x 2.0

 

[k1114]

The gx620 has the option to come with a x600 which uses ~40w. I do see 25w on the spec sheet but the 75w is a mobo implementation after 1.0 and you have 1.0a. You never said why you need to upgrade but at this low end I wouldn't expect gaming unless it's old games. The 5450 uses less power than the 4550 and is better performance. I would say that a 6570 should work but depending on your uses, you may not even need it.

Edit: Nvm I read your other thread and do see you are trying to game. If you can't afford a new pc I'd say go with a 6570 which can be found used for ~$45. If it doesn't work sell it on craigslist of somewhere else for the same price. Googling shows plenty of +25w cards working on the gx620.