Will 2.1 volt ddr 2 work in 1.8 volt dimm?

Uh, you would not want to mix them. Either use the 1.8v modules, or use the 2.1v modules. Check if you can change DRAM voltages in the BIOS.

Well I got the ram, my son and I installed the two 2gb sticks and they work perfectly. Instead of 4-4-4-12 they run at 5-5-5-15. 1.8 volts versus 2.1 didn't end up be a problem. Thanks to all.

Bigjamesbo