The GEIL RAM is 4-4-4-? @2.0v The CORSAIR is 5-5-5-18 @ 1.9V
Since the timings and voltages are different, you'll have to enter the BIOS and manually change the RAM latency settings to 5-5-5-18 and the voltage to 1.9V. You may also need to increase the Northbridge voltage by one "bump" or two since your are populating all the DIMMs.
If you do this, change the BIOS settings while the GEIL RAM is installed, but before you add the CORSAIR. Save and Exit the BIOS. Then disconnect the power cord, add the CORSAIR, then re-connect the power cord, and re-start the computer.