Those are just the pre-programmed SPD settings in the RAM chips, which are selectable with a proper BIOS in a machine. The G74 has a completely un-configurable BIOS so you can't select any SPD settings from any RAM. It just looks for the 667MHz 9-9-9-24 setting, and that is that. Your four sticks are all identical, as far as the G74's BIOS is concerned, so theres no need to switch, unless you've been experiencing wierd lockups/reboots?
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G74SX-CST1-CBIL, i7 2630QM 2GHz
32GB DDR3 RAM @1333MHz
GTX560M 3GB DDR5 (192 bit)
17.3" LED 1920x1080
Sentelic TP, BIOS 203
Debian Linux Wheezy (Testing) Kernel 3.2, NVIDIA 295.40