Is this a good video card?

The mods will mostly be CPU dependent so you won't have an issue there.. My 280X runs Skyrim smoothly on Ultra so I would expect to see a smooth experience on high settings with the 270X.

GTA is also a CPU intensive game. Shouldn't be too much of an issue.
 
You want more than a 270X for mods if you can afford it, especially if you're pushing an ENB.
 
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