mixing different ram voltages

[RobTi]

Hi ready to be shot down in flames but thought i would ask anyway, nephew has a dell dimension c521 with 2x1Gb of ProMos memory that the site says runs at 1.8v, now he has bought Geil 2x1Gb that the site says should run at 2.1v.

So the memory settings are greyed out in the bios so can't be changed i know that different timings would run at the slowest but what about voltages?

Thanks

Robert

 

[RobTi]

Thanks for the quick reply i guess thats a no then will get him to sell 1 set, take it the geil is the set he should keep or is the promos @1.8v better

Robert