I want to upgrade my RAM from 2gb to 4gb on my COMPAQ Presario CQ62 Laptop.

It has two slots:

The RAM is PC2-6400S-666, 667Mhz. The problem is I can only find 4gb kits that are 800 Mhz, not 667Mhz......

If I replace the RAM and the only difference from before is the Mhz going from 667 to 800, will this cause me problems???

Thanks.

PS. I have run the Crucial program and found "compatible" memory, but the kit I'm looking at is 800Mhz, hence me asking my question on here.