I have an ASUS Crosshair IV Formula Motherboard and use Kingston HyperX DDR3 8GB Kit 1333MHz (4x 2GB), 1333MHz, CL7 (7-7-7-20), 1.65V, XMP
I expected the motehrboard to recognize this automatically. However the BIOS readout shows 1.5375V and latency 9-9-9-24 (and some more... params I do not understand). I can change those values manually.
1) Do I need to change BIOS params manualy
2) Has the BIOS changed the values without showing it?
3) Does it simply not make sense for the motherboard - due to the processor clock - to use faster params for the RAM?
"Go into the BIOS and into the Extreme Tweaker put the AI Overclock Tuner on D.O.C.P and try profile 1 or 2 one of them should read your XMP. The board boots up with safe options by default. If the XMP doesn't work put your Dram frequency and voltage in manually then go into the Dram Timing Configuration and set the ram timings to the manufactures recommendations."
There was a 'profile 1' and this did exactly what it should. I had to allow to increas the voltage (but this RAM was certified for 1.65V anway).