Ok, here's my problem.

I got 2 RAMs 2gb/800mhz. Althought the RAM is written on it 2gb/800mhz at the manufactor label, my BIOS says something like this:

DUAL-CHANNEL
DDRII1 - 2048mb/266mhz (DDRII533)
DDRII1 - 2048mb/266mhz (DDRII533)

Do I have to update my BIOS or something? I can't understand what's the problem.