have a gddr5 video card but requires seperate power source pc does not have any options?

20A on the 12V rail wont be enough for most gpus lol (thats only 230W to split between everything in your pc).

The reason your psu doesnt have any pci-e power connectors, is because its a lower end psu which isnt capable of powering a gpu, so its not going to include them so you watch it on fire (cheap crappy psu's often catch fire under very high stress loads).

so if you want to use that gpu, you need a new psu.

Id say the only gpu you could get to work on your current psu would be like a gtx750. a gtx750 is a better gpu then yours, and uses a lot less power.

You should have a 600+W PSU.