Ecs Dual Ddr2 800 Motherboard Drivers

I'm a bit confused by what I've read (I don't overclock and don't know much about RAM). I've got an MSI P6N SLI motherboard that's BSOD'd for the past year and I am looking to replace it. I have two sticks of DDR2-800 ram:
http://www.ec.kingston.com/ecom/configurator_new/partsinfo.asp?root=us&LinkBack=http://www.kingston.com&ktcpartno=KVR800D2N5/1G&id=2
http://www.newegg.com/Product/Product.asp?Item=N82E16820220088
(I've never used them together -- purchased the Kingston in the hopes that my motherboards issues were caused by memory -- they weren't..)
Although this computer was designed to play games for my kids, it doesn't have to be fancy -- I'm not actually using SLI, raid, overclocking or anything else. I was looking at a few low-cost motherboards like the
http://www.newegg.com/Product/Product.aspx?Item=N82E16813138089
http://www.newegg.com/Product/Product.aspx?Item=N82E16813138035
but these motherboards specify DDR2-667 ram. Can I use the DDR2-800 RAM (either one or both) in motherboards that specify DDR2-667? If so, do I need to alter any bios settings?
Thanks.
mcaren
MSI P6N SLI-FI LGA 775 NVIDIA nForce 650i SLI ATX Intel Motherboard
EVGA 256-P2-N615-TX GeForce 7600GT 256MB 128-bit GDDR3 PCI Express x16
ePOWER ZU-550W ATX12V Version 2.0 / EPS12V 550W Power Supply
SAMSUNG SpinPoint T Series HD501LJ 500GB 7200 RPM SATA 3.0Gb/s Hard Drive
Kingston 1GB 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Desktop Memory
SATA CD/DVD drive