Please, help me with annoying dilema

Hi there, so i decided to upgrade my old PC.

I want to buy either Atlon II x4 640 or Athlon II x4 750K, but here is the catch:

My budget is kinda tight atm and i would like to avoid spending unnecessary money as much as possible.

I already have ASUS M4A77TD ((socket AM3) AMD770 chipset) motherboard and since both CPUs costs almost the same in my country - it bugs my mind that i should buy some mATX FM2 motherboard and use 750K instead of older 640 CPU, because that would be clearly wiser judging from the future perspective.

But i would like to avoid spending those 60$ for motherboard if possible :/

So my question would be:

1) If i buy athlon x4 640 (since i got mobo for it) will it bottleneck my HD 7750, while gaming with 1280x1024 19" monitor, using 4gb ram?

2) Roughly how much more performance i would get if i'd decide to buy 750k system instead of 640 (please estimate in % if possible)?

3) What the hell would you do in my situation? haha

Thank you for your time! :)
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  1. Best answer
    fyi, Athlon II x4 750K is AMD APU without gpu
    and it is pretty weak

    use old mobo, and go with 640 or even phenom if you can afford one
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