which is better and why?

Solution
The 650Ti is the better of those two cards and the comparison that mxpie6 put up clearly shows the differences. The 750Ti would be a worthy upgrade from both!

eddieb101

Honorable
Jan 19, 2014
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Having an OC edition will boost the clock speed slightly but that's about it. They've both decent cards towards the budget end of the graphics card market.