Quote Originally Posted by tiger8312 View Post
I found that the 6 pin connector for the PCI-Express power supply line has a capacity of 18 ampere...

Two 12 volt connection with total of 300W for the two.

http://blog.danawa.com/prod/219851
if you go to the link might not be able to read the text but can see the table...

How much does the graphic card actually consume?

Is the amperage not enough to overclock?

At a glimpse the spec seems sufficient...
18A @ 12v = 216w.

PSU looks similar to a few around here, they're fine without a huge overclock...