XFX 4890 2x6 pin PCI-E

Hello all could someone just clear up a problem for me. I recently bought a radeon 4890 with a complete new build but I've never used pci-e card before. The card has arrived and on checking it has 2x6 pin PCI-E and the leaflet says i must use 2 seperate power cables for each 6pin plug, problem being my new power supply only has 1x6 pin PCI-E. The card came with 2 leads looks like 3 pin molex to 6pin pci-e ?. Should i just connect 1 of these leads to the power supply molex to convert it to pci-e 6 pin lol.

I prob sound like a total muppet but i don't want to blow it up before i even use it :P

It should be 4pin molex to 6 pin PCI-E; in which case it will work fine. You should try to get a new power supply with 2x PCI-E cables in the future though

I've just bought a brand new power supply for £45 but it only has the 1 connector i do have 2 convertors with the card though.

Yup, just connect the card via molex-to-PCIe adapter (ofc plug in all the molex connectors :) ).

I'm gutted brand new graphics card and it don't work.. connected it up turned pc on and i get flashing objects and pixels/lines all over the screen i can barely read what anything says. So now need to try and return it to ebay and get my money back im sooooo gutted been waiting over week for my new comp :(