Crosshair V Formula Easy Memory Setup Guide

[rrohbeck]

How do you fellas run your rams @1866 in the CHV ? Any tips on bios settings ? Thanks in advance.

I've done a lot of testing, reading and calculating recently. Here's a spreadsheet that I use to calculate the timings so I could compare them with the RAM datasheet. My DIMMs are Kingston KVR1333D3E9S/4GEC ECC DIMMs with Elpida J2108ECSE-DJ-F RAMs. I ran them with 1866 timings for quite some time up until this weekend but the 1003 UEFI doesn't play nice with them at 1866
https://docs.google.com/spreadsheet/...EdhM0RuX09UQ2c
You enter the settings in columns C to T and it'll calculate the timings in ns in the columns on the right. My original version uses conditional formatting to compare the calculated values to the limits in rows 2 and 3 but Google doesn't support that. I assume that distributing binaries like .ods or .xls is frowned upon but I can make the original version available.
BTW, the way I arrived at the 1866 timings was to load the presets for 4GB DIMMs and then correct the timings via the spreadsheet to get close to what I found in Elpida's datasheet for the 1866-binned RAMs.
Maybe you can use the 1866 timings as-is.

[rrohbeck]

P.S. Is there any information about the new DRAM timing parameters in the 1003 UEFI code? I'm going to do some more testing this weekend. Want to get back to 1866.

[xforce]

After reading this guide, i managed to run my G.skill @DDR3 1866mhz..using new bios 1003. Thanks

[LODEWYK]

I followed all these instructions and my system recognizes the 4 x 4GB DIMMS but only posts 8GB of memory in BIOS. I am using G-SKILL F3-14900CL9D-8GBXL x 2 sets/

[rrohbeck]

FWIW, the 1102 BIOS allowed me to get back to 1866 with my 1333 ECC RAM so I have to assume the 1003 was a lemon
It took some fiddling with drive strengths again though so I'm pretty close to the edge.

[iowa_hawk1]

I have Crosshair V Formula mb with Phenom ii X4 955 and two 4gb sticks of crucial ballistix 1866. I tried to follow the directions to set the memory speed but the highest option that shows up is 1600. How do I set it to 1866?

[Raja@ASUS]

1600 is the highest ratio. You will need to increase CPU BUS/Peg Frequency to get DDR3-1866. Choose the 1600 option and increase CPU BUS/Peg Frequency to 233. You will need to reduce the CPU multiplier ratio, otherwise you will end up overclocking both the CPU and memory. You can keep an eye on the CPU frequency by referencing the top left corner of the AI Tweaker menu which shows target frequencies for the CPU and memory.

[Igdirli 76]

Hallo people,

i have installed 16gb ram on my crosshair v formula but when i go to main menu i can see onl 8192mb but in the menu "Advanced" North Bridge i can see all my rams 4x4GB RAM (F3-12800CL9D-8GBRL) from g.skill.
Than i have one question when i open CPU-Z then i see the frequency "800mhz" but my ram is 1600mhz.

Sorry for my bad english.

Best regards

[ktony]

Hallo people,

.....
Than i have one question when i open CPU-Z then i see the frequency "800mhz" but my ram is 1600mhz.

Sorry for my bad english.

Best regards

On the frequency: 800Mhz in CPU-Z is the base clock rate. Your DDR RAM is running at twice that.

[HiVizMan]

It's DDR (Double Data Rate) RAM so your ram is spot on.