F3-17000CL11-4GBXL stuck at 1600MHz

[james73]

Hi,
The memory in my system (I believe) is rated to run at up to 2133MHz, though currently I can only get it to run at 1600MHz.

If I try to get the memory running at 2133MHz by selecting the XMP Profile1 the system does not post (it actually did one time and appeared, but on reboot I was unable to post again). I've also tried the XMP Profile1 with bumping the DRAM voltage from 1.5 to 1.6v, which let me successfully post but once again I got an unable to post message on reboot (is there another voltage I should try boosting).

Is it possible to reliably run at 2133MHz with this combination (or even 1866MHz), or am I stuck at 1600MHz. I've read something about bumping up the Memory and/or CPU voltage but I'm pretty in the dark about what the risks are there and what values I should be attempting in able to ensure the system runs happily.

The relevant parts in the system are:

* i5-2400
* Gigabyte Z68X-UD3R-B3 (F6 Bios)
* G.Skill F3-17000CL11D-4GBXL (2x4GB)

Any suggestions/advice would be very appreciated, thanks in advance!

[james73]

No ideas?

I've tried a few things, including adjusting voltages (of the DRAM from 1.5 to 1.6v) as well as ensuring the timing values match as they should (Profile1 appears correct) but no dice.

[GSKILL TECH]

You may want to try 1866 first, that CPU may not support 2133.

Boosting the VCCIO Voltage can help the memory controller.

DDR3-1866 9-11-10-28 1.60V

[james73]

Hi,

Thanks for the suggestions, they we're certainly helpful.

The VCCIO/VTT voltage was the key here, booting it from 1.05V to 1.1V (with the DRAM voltage at 1.6V).

I'm happily running at 1866MHz with the timings you gave me (though 9-9-9-28 seem stable as well).

Thanks a lot for the help!

[GSKILL TECH]

You can test to see which is faster. Some times the lower latency is not necessarily faster even though theoretically lower is quicker.