Can't seem to use XMP profile or overclock RAM

[martin.carline]

Specs -

Motherboard - P55-UD3L motherboard (updated to 2.3)
RAM - Corsair CMY16GX3M2A2400C11R Vengeance Pro Series 16GB (2x8GB) DDR3 2400Mhz

Unfortunately I can't seem to get the motherboard to use the XMP profile. After I use XMP and save and exit, it reboots and then says I am overclocking and it's unstable and won't boot to Windows.

Is it the motherboard that's the problem as it states it only accepts 2200Mhz?
Also, I have tried raising the base clock to increase the MHz over 1600 but it still says I'm overclocking and won't let me boot.

I am currently only to get it to run at 1600.

Any suggestions?

 

[martin.carline]

I think I might have answered my own question as I've found this -

'...the i7-875K is limited to 1333 MHz data rate.'

So am I quite lucky that I am even getting 1600MHz?