Pentium D 945 3.4GHZ

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@TechyInAZ is right.
I have a Intel Core 2 Quad and it doesn't bottleneck my GTX 650 (no big deal, but make the trick). I've played Battlefield 3 and 4 with a decent FPS at medium settings.

The question is! Upgrade the CPU or upgrade the CPU+motherboard+memory RAM? The Intel Core 2 Quad uses chipsets that is only compatible with DDR2 memory RAM. Again, I used DDR2 too and had no problems. But I'm planning to upgrade the motherboard+memory RAM+CPU because it will make difference. There are only memory RAM of 2GB per module, and Battlefield 4 requires at least 8GB. It is nobrain put 4x2GB instead of 2x4GB.
If you can wait and save some money for motherboard+CPU+memory RAM upgrade, it is the best move.
 

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Even better he can get the G3258 or an i3 if he is not an overclocker with a new mobo and couple sticks of 4 GB RAM. The i3 or the overclocked Pentium dual core will be a nice and well balanced combination with the 750Ti and you will also have some room to upgrade your GFX card in the future.
 


One correction to your post, there are DDR3 lga 755 mobos like the gigabyte X38T-DQ6. I personally have one sitting next to my desk lol.
 

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I owned one and it wasn't snappy at all! But I have also used one inside an HP machine and it felt much snappier than mine. My machine ran XP though, the HP machine ran Windows 7 and had more RAM. But it certainly will bottleneck a GTX 750Ti, that is I am sure of. Many modern games are becoming increasingly CPU dependent and the 945 simply doesn't cut it. I made a recommendation to the OP to get a new mobo, an i3 and RAM if he can afford it. It will offer him a much better gaming experience than the outdated core2 quad chip.
 
The Pentium D was a decent performer at the time, and a major step forward as dual core processors hit the mainstream. One of its limitations was that Intel literally just stuck two chips together on one die, and the two cores did not have direct communication (AMD's X2 chips, including the popular X2 3800+ were the first dual cores that communicated directly).

At this point, the entire Pentium D is totally out of date for anything, with performance that a modern Atom can beat.

For a gaming box, the Pentium D will definitely need to be upgraded to whatever the budget allows, and the performance will be much better.