I am going to pair a gtx 560 ti or non-ti (i havent decided yet) with an AMD Athlon(tm) II X2 250 Processor
Will i get any sort of bottleneck ?
Rest of the system
4gb ddr3 ram
ASRock N68-S3 UCC
550 w psu
A faster CPU would be a better pairing, but at such a low resolution I doubt you'll see too many problems, but it'll depend on the games youre playing, some are heavily dependant on CPU power, others are not.