Setting RAM to 2400

XMP Profiles

Grab CPU-z from HERE, install it, and show me a screen grab of the SPD tab please

CPU-z > SPD tab

Tharayman wrote: XMP profile will only allow 2133 as well. From what I read it seems like the integrated memory controller in the I5 2500K will only support memory speeds up to 2133mhz. Perhaps someone is able to confirm this? (Or sell me a 3770K)

The specifications of the i5-2500K show the maximum memory speed Intel guarantees the CPU will support is 1333:

http://ark.intel.com/products/52210/Intel-Core-i5-2500K-Processor-6M-Cache-up-to-3_70-GHz

Any memory speed above 1333 is a memory over clock for a Sandy Bridge generation processor like the i5-2500K.

The specifications of the i7-3770K show the maximum memory speed Intel guarantees the CPU will support is 1600:

http://ark.intel.com/products/65523/Intel-Core-i7-3770K-Processor-8M-Cache-up-to-3_90-GHz

A memory OC of 2133 is excellent for an i5-2500K. Going higher to 2400 may not work at all. It depends on what memory you have, and the limits of the memory controller in your CPU. You may be at the limit of your memory controller now, as well as your memory.

What model of memory are you using, and how much do you use?

Have you tried setting the memory speed to 2400 in the UEFI/BIOS? You will normally need to set the primary memory timings to looser values. Also, increasing the DRAM voltage above 1.5V will probably be necessary.

You may also need to increase the VTT and VCCSA voltages to reach a higher memory speed. All of that are basic memory over clocking techniques. Usually DDR3 memory that is rated to work at an over clocked speed like 2133 won't go much higher, or not at all. The only way to find out if it will is to try.