Will the FX 4100 bottleneck with Radeon HD7770 Crossfire?

No it will be fine. Bulldozer CPU's only bottlenecked high-end video cards like the 6970 (at it's time), 570/580 (at the time before 600 and 7000 series were released) and would have trouble with the newer generation of high-end cards like the 7970 ot 670/680.
 

bobowyc

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Just to bump this up with a question. I am currently using an FX-4100 with HD 6770. Is it advisable to upgrade my gpu to hd7790 or the new r7 260x? Would it bottle neck the cpu? Or else I am thinking of getting a FX-6000 or FX-8000 series. Any suggestions and comments?
 

bobowyc

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What about the r7 260x? Will it bottleneck my cpu or it wont? Because the price is almost similar to each other. In my country its like a RM30 difference..