The 2nd set I linked to has a slight advantage with it's timings 7-7-7-24-1T and they have a lower voltage requirement, 1.6 volts. Where as the 1st set has timings of 7-8-7-24-2T and a higher voltage requirement, 1.65 volts.
While the i5 750 with the P55 Chipset is different than the i7 920 with the X58 Chipset, they are quite simular. Even if you don't overclock there is some good info in this thread to increase your knowledge