4-pin molex

I need to connect my old Graphics Card FWB-PCIE1X21 (Big IDE 4-pin DC Power Connector) to my new Thinkstation P350 with a 6-pin and a 2-pin PCI Express power cable. Can anyone suggest a way how to do so if possible without frying my card?

So, i’m planning on buying a custom water loop, and asking the pump for my upcoming birthday. But im stuck with a question. The pump is fitted woth an 4-pin molex and a PWM plug. Do i need to plug in just the molex, just the PWM or both. And where do i plug in the PWM? In the CPU-fan header or...