Is this 500w enough for a 280 or 280x?

[BigBuoy]

I have this power supply: Thermaltake Purepower W0100RU 500W

Can it run a 280 or 280x? I don't plan on overclocking it. I'm on a bit of a budget here and I don't know if i should upgrade and wait to get a new gpu or get the gpu then upgrade the psu along with a new cpu and motherboard.

Also could I run a 970?

Rest of my specs
fx-4100
7850 1gb
760GM-P34 (FX)

 

[Dee Kay]

Tests run by Hardware Secrets showed the your PSU is really a 405W unit. Their tests show failures when running higher voltage tests at over 25C degrees which most PC's running intensive programs longer than a few minutes exceed. You should look at a better PSU before you get the GPU.
http://www.hardwaresecrets.com/article/Thermaltake-Purepower-500-W-Power-Supply-Review/990/9

Read the PSU tier article here on TH before picking one. You should be fine with one rated at 600w or above depending on your GPU or whether you plan to do other upgrades in the future.
http://www.tomshardware.com/forum/id-2547993/psu-tier-list.html

***Edited to add forgotten link to PSU review

 

[Apoorva Kumar Srivastava]

Yes you can run it properly. Try to buy a decent PSu, don't buy a cheap PSU because it is one of the most important part of a rig.
Use this link to find the best psu for your needs - http://www.tomshardware.co.uk/forum/id-2547993/psu-tier-list.html
Hope this helps!

 

[BigBuoy]

Thanks guys. I think I'll upgrade my power supply and then go for the new gpu.