The 660 should be just fine for 1080P 60FPS on medium(with other more intensive effects turned off).

If you do want to crank up the options(including the intensive affects) i'd recommend getting a GTX 960 4GB. You shouldn't need a new power supply as the GTX 960 actually consumes less power  than the 660(this is assuming your power supply has an 8-pin power connector, which is required for some GTX 960s).

For an idea of what actual in-game performance might look like(for the GTX 960), this YouTube video should help: https://www.youtube.com/watch?v=okHma4rP1ao

Thanks. Do you know if the 960s is the same dimensions as the 660 because the alienware x51 case is quite compact

Thanks. Do you know if the 960s is the same dimensions as the 660 because the alienware x51 case is quite compact

Depends on the model of the GPU. From what i've seen the 51x has a modular graphics tray that fits into the PCI Express slot which has about 2 inches of headroom in terms of length. Unless the modular tray is in the way or something actually uses that space you shouldn't have any trouble fitting one of the larger models in there.

However, because of the small form factor your going to want a blower style cooler like the 660 supposedly has(see below video).

Something like this: http://www.newegg.com/Product/Product.aspx?Item=N82E16814133589

Btw, does this look like your model? It does have a 660 but i'm not sure on the exact model:

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Double Post Merge: January 16, 2016, 06:59:18 pm

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On the topic of radiant performance:

It looks like its CPU bound(as long as you have a 750 TI or better anyway). When on the payload map and looking around, my second CPU core of my quad core i5 is 80% is used.

Depends on the model of the GPU. From what i've seen the 51x has a modular graphics tray that fits into the PCI Express slot which has about 2 inches of headroom in terms of length. Unless the modular tray is in the way or something actually uses that space you shouldn't have any trouble fitting one of the larger models in there.

However, because of the small form factor your going to want a blower style cooler like the 660 supposedly has(see below video).

Something like this: http://www.newegg.com/Product/Product.aspx?Item=N82E16814133589

Btw, does this look like your model? It does have a 660 but i'm not sure on the exact model:

Spoiler: click to open...

https://www.youtube.com/watch?v=MiqC-fgyOUY

[close]

Ya I was looking at the fans. I found a msi one that would work but it was on 2gb and twice as much to buy as the one you showed me which is 4gb. Thanks for looking.
And ya that youtube video of the cleaning looks identical to my pc. The card is housed in this mounting bracket but it looks like it should work. I give it a go. If it doesn't work I'll just sell it on Amazon or something.

Just ordered new PC

Hitman is that a pre-built PC or did you put that together yourself? Also a Skylake processor is not needed as the performance difference between Haswell and Skylake is minimal. I'm Currently running an i5 4690 with a GTX 970 and 16GB RAM and it handles Black Ops 3 on the highest settings with about 90-120 FPS.

Just ordered new PC
(Image removed from quote.)

Finally it has come where Hitman no longer plays at 20FPS and his screen no longer flickers,  also I assume you're getting a 1080p screen as well or you have one? Because anything less and tbh you're wasting money on that 970.

Hitman is that a pre-built PC or did you put that together yourself? Also a Skylake processor is not needed as the performance difference between Haswell and Skylake is minimal. I'm Currently running an i5 4690 with a GTX 970 and 16GB RAM and it handles Black Ops 3 on the highest settings with about 90-120 FPS.

Pre-build PC from Finnish website. I would get frustrated with building it, if I would buy all parts

Finally it has come where Hitman no longer plays at 20FPS and his screen no longer flickers,  also I assume you're getting a 1080p screen as well or you have one? Because anything less and tbh you're wasting money on that 970.

Yeah, I will buy new monitor also. This pack comes with keyboard also and I have good gaming mouse already, so its just buying new monitor and maybe headset

Thanks. Do you know if the 960s is the same dimensions as the 660 because the alienware x51 case is quite compact

660Ti owner here. Installed my brother's 960 for Christmas. It is wider, so you'll have to have space on the side/above of the case when you plug it into the mobo. I do believe it's slightly thicker but not enough to make a difference.