No. Check your board specs first. You may be limited to 2 gb per slot; You can use another 2x1 gb kit with your old ram or go with a 2x2 gb kit as I suggested, and keep the leftover 1 gb for testing or sell it. If you use a name brand kit of ram, it should work with your old ram: corsair, kingston, crucial, hynix, or gskill. Do not buy the 4 gb stick; you may be wasting your money or the board may only recognize 2 gb of it.