Issue with RAM Frequency

[jon_mann]

New to building computers and I am having an issue with getting the full speed of the RAM I have installed.

Setup

Maximus IX Hero
i7-7700K
Corsair Vengeance LPX DDR4 16Gb 2400Mhz
ROG STRIX-GTX1070-O8G-GAMING
Samsung 960 EVO 250GB M.2 SSD
Seagate 2TB HDD
Corsair H80i V2 Water Cooler
Running BIOS version 0906

Problem I have is that I have set the BIOS to XMP and it recognizes the RAM, but when I save changes and it reboots I get error code 55 (memory not installed) on the motherboard display. If I then change the frequency to 2133Mhz I can boot up normally.

Has anybody got any suggestions?

Thanks is advance.

[Nate152]

Hi jon_mann

Welcome to the ROG forum.

2400MHz should run pretty easy but since it's giving you trouble try setting your ram manually.

Hit F5 to reset to defaults.

1) On the Extreme Tweaker tab set the AI overclock Tuner to Manual
2) Scroll down to Dram frequency and select 2400MHz.
3) Scroll down to Dram voltage and enter in 1.20v
4) Scroll down to CPU Sytem Agent voltage and enter in 1.10v
5) Scroll down to CPU VCCIO voltage and enter in 1.10v

6) Go to Dram Timing Control and and the very top select Maximus Tweak Mode 1, under primary timings set:

14
16
31
2N

F10 and Enter

How does she go ?

[jon_mann]

Thanks for the reply.

Will give it a go and report back.

[Nate152]

Great and thank you, I got my fingers crossed. 🙂

[Chino]

Is that a single memory kit? Also are you running the latest BIOS for your motherboard? 🙂

[jon_mann]

@ Chino - 2 sticks of 8GB, running 0906 BIOS.

@ Nate152 - have tried this morning, but cannot change the Voltages or the timings, they are stuck to auto and greyed out. Is there something else that I need to change so that I can manually adjust these?

One update though, I put it back in XMP and changed the frequency to 2300Mhz and it booted up fine, just 100Mhz to find.

[Nate152]

I'd say the problem lies with combining two separate sticks, can you return them for a single 16GB kit ?

I'm not sure why the Dram voltage would be greyed out, if you're able to change it try the Dram voltage at 1.25v - 1.30v.

[chevell65]

The tested latency for this memory is, Tested Latency: 16-16-16-39 2400 MHz
Voltage: 1.2V
Might want to adjust latency to these numbers....

[Nate152]

I went with the timings corsair has for their 2400MHz 16GB kit, he says he can't change the timings and voltage and that is throwing a red flag.

I wonder if the sticks are exactly the same or if they might have different timings.

http://www.corsair.com/en-us/vengeance-lpx-16gb-2x8gb-ddr4-dram-2400mhz-c14-memory-kit-black-cmk16gx...

[chevell65]

I found another site with the same memory but the settings were a bit different for some reason, more relaxed on the timings. Two versions of this memory but without all the numbers or looking at the sticker can't tell the precise latency. CMK16GX4M2A2400C16 but there is also a C14 version.

I'd rather go by the sticker on the actual memory being used because every lot seems to be binned differently.

It should be possible to change the settings after switching to the manual settings but the manual switch is not so easy to find sometimes.