If those spaces where there are no caps have previously had caps fitted there will be evidence of solder marks on the reverse. If they are nice clean holes then they are just there for a different design. It looks like they are so my next question is what make is it. I'm not even sure at this stage that it is a 5850.
Says on the box:
Ordering code: HD-585X-ZAFC
HD 5850 725M 1GB DDR5 DP HDMI DUAL DVI
made in China
and there are no clean holes, the 3 on the bottom right are filled with solder, ive put it in the oven twice and no luck, but maybe it could be my psu not having enough power? i have a 700W Alpine due to sticking to a budget
Well from what you are saying it does sound like it has some caps missing. If it does then the oven trick as you put it wont make any difference.
Its basically you doing a DIY Bake to repair any solder cracks. Usually on a motherboard. I have seen articles where it has worked on a Motherboard. I have seen a few attempts with a GPU . None were successful.
I have actually heard stories of people doing the oven trick with 8800gtx's and ultras and it worked out well for them....its a temporary fix that will just repeat itself over time.....but as mactronix said if you are missing caps then the oven will do nothing for you. your best bet is either get another card or try and rma this one maybe you will get lucky and get a free card out of it.