will 2 6 pin pcie power conectors work on a 4870x2?

hi, im going to buy a 4870x2 soon and i noticed that it needs 1 6pin and 1 8pin pcie power conector. my psu is a 700w OCZ with 2 6pin pcie conectors. i think 700w will b enough to handle it, but do i need to buy a new one just for the 8 pin conectors??? i dont want to spend money on a new psu if i dont have to. thanks

No.
You will need bouth a 6 pin and an 8 pin PCIe power connector pluged into your 4870x2 for it to work.
Many come with adaptors for systems that do not have a PCIe 8 pin connector.
If the one you decide to purchace does not, you will need something like This.