If its certified, then no problem. If it isn't, it will void your warranty
I recommend you stick to Kingston (part nr KTD-DM8400C6/1G)
Its a 1g stick, and you got space for 4
cost you $19 at their own webshop (Promo Price Now: $13.00 )
http://www.ec.kingston.com/ecom/conf...TD-DM8400C6/1G