I want to purchase new ram for my laptop

[LVishere]

I am getting ready to purchase my ram, and I was wondering if it's okay to purchase a set of 6400 (800+mhz) instead of 5300 (600+mhz) ram? My computer currently has 2gb 5300 (633mhz) 200-pin but I want to upgrade to 4gb 6400. but like I said, I don't know if I should purchase the 5300 or 6400. Sorry if this makes no sense. I am so tired right now.

 

[x BlueRobot]

Use the Crucial memory scanner to test your motherboard compatibility with the type of memory:

SDRAM, DDR2 and DDR RAM memory upgrades from Crucial.com

 

[LVishere]

Use the Crucial memory scanner to test your motherboard compatibility with the type of memory:

SDRAM, DDR2 and DDR RAM memory upgrades from Crucial.com

Memory:
DDR2 PC2-5300, DDR2 PC2-6400
Memory Type: DDR2 PC2-5300, DDR2 PC2-6400, DDR2 (non-ECC)
Maximum Memory: 4GB
Slots: 2
Each memory slot can hold DDR2 PC2-5300, DDR2 PC2-6400 with a maximum of 2GB per slot.*
*Not to exceed manufacturer supported memory.