Sapphire Vapor-x 7950 OC PSU connection question

Hello all!

I'm thinking of buying a the sapphire 7950 Vapor-x OC, to replace my old 4870 which uses 2x 6 pin connectors.
The specifications lists the 7950 as using 2x 8 pins.

My PSU is an Antec NeoPower 500w
http://www.antec.com/specs/NeoPower500_spe.html

My psu however have 1x 8 pin (not sure it's PCI-e, but it has 8 pins) and 2x 6 pins PCI-e, and the 7950 comes bundled with 2x4 pin to 8 pin.

So my question is: Is it sufficient to use some sort adaptors (and which) Or is it time to get a new psu?
I would prefer to keep my old PSU to keep the budget down.

Hope someone has the answer to this. I've searched far across the web, but I haven't been able to find a solution.

:-)
Regards.