Thanks for putting out my concern about the voltage at least! Thanks!
Regarding the speed of the mem... the specifications of the mobo says it supports 1066 Mhz. I will show you a part of it:
Support for DDR2 1200 (O.C.)/1066/800/667 MHz memory modules
You can read it all athttp://tw.giga-byte.com/Products/Motherboard/Products_Spec.aspx?ClassValue=Motherboard&ProductID=2744&ProductName=GA-EP35-DS4
Could this possibly still be a problem even if the mobo natively supports this speed?