Non booting pc..PSU to blame?

[Wiganer]

Hi all

After slowly replacing my old pc bit by bit, I thought I'd finally finished when I took delivery of a 2nd hand AMD 7870.

However, once installed my pc refuses to post and I'm hoping it's my ancient PSU rather than the card.

It's an Akasa PaxPower 460W.

Am I right in thinking that my graphics card isn't getting enough power?

Thanks

 

[Wiganer]

I've got an ASRock z97 anniversary, i5-4750, 8gb ram, 256gb ssd and a couple of fans

 

[Wiganer]

Replaced the PSU with a 550w jobbie and that's done the trick!