8 Pin power plug question

[Amiteriver]

Have 2 - 8 pin plugs on the power supply for mother board. My question can you use one of them on a 8 pin plug on a ATI 2900xt. In otherwords are all 8 pin plugs the same voltage?

 

[[Spectre]]

What power supply do you have that has two EPS connectors?

 

[Amiteriver]

Silverstone 1000 has 4 - 6 pin and 4 - 8 pin. 2 - 8 pin are labled for v cards the other 2 are just 8 pin. Oh yea it has a 4 pin also

Anyway are all 8 pins the same ?