When asking for hardware and/or upgrading advice it's advisable to state the specification of your current hardware.
No two systems are the same and what one may recommend may not be suitable for YOUR system.
Basic specs are as follows:
Motherboard (Manufacturer and model number).
CPU (processor).
RAM type and amount installed.
Graphics card .
Operating System (XP, Vista etc.)
It would also help if you know your Power supply unit output.
[b]This is to avoid repeat posts such as
Simviation Forums
Flight Simulator and other chat