2 DIFFERENT graphics cards?

Solution
If your mobo has two PCIe x16 slots then yes. But note that you can't combine their power - the only scenario you get any benefit is when you use more monitors that your primary card can use, in any other case the secondary card is just eating power and do nothing (unless you use it for mining).
If your mobo has two PCIe x16 slots then yes. But note that you can't combine their power - the only scenario you get any benefit is when you use more monitors that your primary card can use, in any other case the secondary card is just eating power and do nothing (unless you use it for mining).
 
Solution