P9X79PRO memory speed issues

[TRAINS]

Good morning!

First I'd like to thank everyone for their informative posts on this board - has definitely helped at various stages of my first computer build. 🙂

I purchased a Kingston KHX1866C9D3K4/16GX memory kit to go with my P9X79PRO, but BIOS shows the RAM speed at 1333 rather than 1866. CPU is the i7-3820.

From what I gather, this is normal and requires manual tweaking in the BIOS to increase voltage and modify the timing to allow the RAM to run at designed speed.

From Kingston's manual:

XMP TIMING PARAMETERS
• JEDEC: DDR3-1333 CL9-9-9 @1.5V
• XMP Profile #1: D3-1866 CL9-11-9 @1.65V
• XMP Profile #2: D3-1600 CL9-9-9 @1.65V

I'm not sure where to input the "9-11-9" timing values... in my quick searches most timing changes have 4 sets of values to change. I can only find 3 and I do not know which options in BIOS they correspond to.

I really have no intention of over-clocking this machine, I simply want to run at the stock performance levels.

Alternatively, can anyone recommend a set of RAM that is truly plug and play and will operate at 1866 without any tweaking in BIOS? I think this is my preferred option...

Thanks!!

 

[bankster55]

you go into bios AI Tweaker page/AI Overclock and PICK the profile you wish
The latencies is a shorthand its 9-9-9-24-2T
1866 is a waste, higher speed RAM is a waste of money, the MCH (memory controller hub) is on the CPU die - no more bottleneck
Needing higher voltage to achieve speed (1.65V) adds new issues

You want GSkill 1.5V 1600 999924 2T specified as for 4 channel X79 mobo
http://www.gskill.com/products.php?index=427

You must only use a single kit for RAM install, never multiple

 

[TRAINS]

Bankster - Thanks for the reply. I posted this question on an overclocking forum as well and arrived at the same conclusion that I should find a set of memory better-designed for my board. Your comment further supports this.

I was actually considering the exact set you linked! Thanks again!