PC specs 

 

CPU: Intel Core I7 x4 @ 3.40 Ghz

Primary Drive: 2TB HDD

RAM: 8GB

GPU: NVIDIA GeForce GTX 420 4gb

OS: Windows 7 Professional x64

 

should I use a after burner with GTA?  

 

Strictly speaking, MSI Afterburner can be used with any game on a large variety of cards (including non-MSI cards) so in that respect, yes, you can certainly use it with GTA.  Overclocking is very common and, if done correctly and safely, it can sometimes improve performance in games depending on how far you overclock.  It appears that your GTX 420 is probably going to be the deciding factor on how well GTA will run, as well, so overclocking is likely to help at least a little bit.

 

You have to keep in mind though that overclocking leads to extra heat output, so remember to monitor temperatures.

 

This is a good guide for someone looking to overclock:  http://lifehacker.com/how-to-overclock-your-video-card-and-boost-your-gaming-30799346

you can use it to record your gameplay too

yeah I just need something to boost my FPS in SP so I don't get texture load lag