Not to be priggish, but are you sure that your motherboard supports those CPUs?
Asrock gives a list: ASRock > Products > N68-S > CPU Support List
Neither of your choices are on it.
The 965 is a 125W TDP chip, which is higher than the highest approved ones (95W). That looks likely to be a problem.
I presume that the 1045T will be compatible, like the 1055t, although it'd be nice if it was listed explicitly.