hello.i have a 4,00GB Dual-Channel DDR2 @ 399MHz (6-6-6-18) and i would like to upgrade it to 8 gb.could you suggest me something??my motherboard is Packard Bell imedia S3712 and my cpu intel core 2 Quad Q8300 @ 2.50GHz.i'm really confused with what type of ram to choose and the mhz etc.i am willing to spend up to 90 or 100 euros