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yes just by putting the the 800 in when the 667 is in,  your mother bored will auto clock the ddr2 800 ram stick to ddr2 667 speed

Ok  because I was gonna try out 3GB of memory playing Command and Conquer 3: Kane's Wrath.  I played Tiberium Wars with 2GB and it works fine but Kane's Wrath causes my computer to freeze up and locks up and they both have the same minimum and required standards to run the game.

Windows XP or Vista:   I have XP
Installed:  In order to run Kane's Wrath, Tiberium Wars have to be installed first
CPU: Intel P4 2.2GHz/ AMD Athlon 2000+ for XP  :  I have AMD Athlon 64 X2 3800+
RAM: 512MB minimum (1GB Recommended) : I have 2GB of DDR2 800 and a spare stick of 1GB of DDR2 667
DVD Drive Installed : Yes
Hard Drive:  6.3GB must be free space.  I have over 90GB Free Space.
Sound Card: Yes
Video Card: Directx 9.0c compatible with minimum of GeForce 6100 : Yes.  I have the MSI NVIDIA GeForce 8500 256MB GDDR3 OverClocked.

I have it set at the default  600MHz core speed   1200MHz Memory clock speed.

The thing is   it works with this setting on Tiberium Wars but not Kane's Wrath. Once into a mission after a few minutes,  the computer locks up.

Any ideas?
 
:Edit:  Kane's Wrath is the expansion pack to Tiberium Wars