Installed new GPU now monitor won't turn on. Do I need to update my PSU?

[jordankylemoore]

Hi i recently purchased a Asus HD7850-DC-1GD5 graphics card form my pc. i followed the instructions when connecting it. my pc starts up but the monitor has no signal no matter how i connect it. I now believe this card should be connected to the power supply as well however the card has a 6 pin input but my ATX-550W power supply only seems to have 4 pin plugs on it. Can someone please help me?

My specs are

Intel Core i5 2320 3.00GHz
Intel H61M
8GB DDR3 1333Mhz Ram
1TB
Windows 7
550w PSU

My old GPU was a ATI 6450 1GB DDR3 and everything worked well but it lagged on Arma 3 so I thought I'd upgrade. Guess I should have asked for help first

 

[RulesSpew]

Your gpu consumps about 270W on load.
And your rest components about 100 total 350-370 total system power consumption.

Here look :
http://www.guru3d.com/articles_pages/amd_radeon_hd_7850_and_7870_review,7.html

Your 550W PSU is more than enough. You are good to go

 

[bluehowell]

If the card is not connected to the 6 pin then it wont work, it needs the additional power. So you will need to get a psu with a 6pin pcie connector

 

[smorizio]

in the video card box should be a 6 pin pci power to four pin molex cable.
http://www.newegg.com/Product/Product.aspx?gclid=CLbXmK6ugrwCFahj7AodMCYAfA&Item=N82E16812887001&nm_mc=KNC-GoogleAdwords&cm_mmc=KNC-GoogleAdwords-_-pla-_-Internal+Power+Cables-_-N82E16812887001&ef_id=UrwdzwAABMwXtx4B:20140116091741:s
that should let you power up the video card. at some point you should put in a newer power supply that has the right power plugs.

 

[jordankylemoore]

RulesSpew - Thanks for the article it is a good read

bluehowell - thanks for the info I will look into upgrading my power supply in the near future!

smorizio - there was no cable/plug in the box but now I know what I need I might buy one as a temporary fix but will eventually get a psu I don't want to do any damage.

Thanks again everyone

 

[bluehowell]

Ideally you don want to use a molex adapter as generally if a psu didn't come with a 6 pin pcie connector it is because it is not up to the task due to it's very low price. I wouldn't risk using a molex adapter with my new graphics card. Cheap power supplys are very risky and there is a chance it may destroy hardware attached to it.