gigabyte 965p - dq6 and kingston pc 8000

hi!
at first time,sorry for my english, i speak english only a little

I was tlaking with all of you yesterday about this motherboard anda this ddr2, but i dont find my answers now,today!!

PLease,please,help me!
the history is that one friend have on the way from USA one kingston hiperx dual channel pc 8000 ddr2 ( 1000mhz ),one gforce 880gtx, and one intel quad core.( dont changes for anything ), and i could be able to put all of this working,but......my worst problem is the motherboard.

I dont know what motherboard can i bought.
I have a look with GigaByte 965P-DQ6 (suports 800 mhz aximum officially ,and i hav ddr2 pc 8000, 1000mhz), and i like it very much, but...i think tihs:

Memory fastest than motherboard supports------>dont wrok anything.
Memory slower than motherboard supports------>ok.
is this true???

with this motherboard and this ddr2 the sistem wiil be ok only modifying my bios??or may be the sistem dont works anything and it could be better buy another motherboard??
wich motherboardcould you tell me is the best for me??( money is not a problen for my friend,we are very afraid)

Many many thanks for all.