NEED HELP GUYS PLEASE <3 HELP :( / Upgrade or leave?

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You already have one 6 pin pci express power connection you need 2 to use the 660Ti. So you would connect 2 4 pin molex cables into this and you get 1 pci express power connection.
molex_pci-e.jpg
 
 


Ive gotten the Graphic card for a week and its perfect.
I do get loads of lag spikes and things like that i run 40-70 frames but i get lag at moments do you know why?