ASUS Corsshair IV (Compatible Memory????)

[mitso]

Im planing to buy a ASUS crosshair IV. I have checked the gskill web site but have not found anything that shows crosshair IV compatibility. On the ASUS web site it shows me a few gskill memory sticks i can get, but the timing is 9-9-9-24. I am looking for something lower. I would like to know what would be the best ram i can buy for it in a 2 gb stick and 4 gb stick, or if i get one of the following what can i lower the timing to, but still have it stable?

G.SKILL
F3-16000CL9D-4GBRH(XMP)
9-9-9-24
1.65 v

G.SKILL
F3-16000CL9D-4GBTD(XMP)
9-9-9-24
1.65 v

G.SKILL
F3-16000CL9T-6GBPS(XMP)
9-9-9-24
1.65 v

Thanx [Mitso]

[GSKILL TECH]

Generally, for every 266MHz you can go down 1 clock cycle, so all three of these should be capable of DDR3-1866 8-8-8-24, DDR3-1600 7-7-7-21.

Thank you
GSKILL TECH