getting higher RAM speeds

donohue100 · Mar 22, 2018

Hello,

I recently purchased Corsair 16GB Red Vengeance LPX DDR4 4000MHz RAM/Memory Kit 2x 8GB
with a Intel i7 7800X CPU + MSI X299 TOMAHAWK AC Motherboard Bundle.

I was told this is all compatible but I should of looked it up myself. The max I can get out of the RAM is 3200MHz anything over that and it crashes. The CPU is rated for 2400 I believe.

Is there was a way for me to manually clock the memory as the XMP profile does not work. I have the voltage on the RAM set to 1.4 but and higher the text turns red.

OC RAM is something I have no experience of doing. It also states the RAM is quad channel RAM but it always appears as dual channel even though MB and CPU support quad channel RAM.

I'm new to intel and basically have no idea what I am doing.

Any help would be greatly appreciated. I have the CPU OC to 4.2 with definite room for more is CPU speed and RAM speed tied together.

Thanks.

SkyNetRising · Mar 22, 2018

Quad channel mode requires either 4 modules (in correct slots) or 8 ram modules (in all slots).
With 2 modules you can't gen anything more than dual channel.

Can you post screenshots from CPU-Z memory and spd sections?

geofelt · Mar 22, 2018

First of all, you need a 4 stick ram kit to get quad channel operation.

The 2400 speed is the default ram speed that lets you get into the bios so you can set it up for higher speeds.
Anything over 2400 will generally be considered as overclocked ram requiring more than 1,2v.

Next, as to speed, there should be a couple of XMP profiles imbedded in the ram.
They contain voltage and cas settings to make the ram run at the specified speed.
That assumes that the motherboard and cpu will support that speed.
Your motherboard certainly supports 4000 speed, and I must assume your top of the line cpu does also.

One thing to check is your motherboard bios level.
Many times updates address ram compatibility issues.
I would not update the bios on speculation.
Update only if you think an update might address your issue.

Corsair has a very good support forum.
You might get better and more authoritative answers directing your issue to them.

donohue100 · Mar 22, 2018

geofelt :

Hi, Thanks for the advice, the rated specs for the CPU say DDR4-2400, I cant get any xmp profiles to work, the embedded profile gives code 00 and fails to boot. When I try any voltage over 1.4 for mem the text turns red which starts to concern me.

The stated xmp profile is 4000MHz Speed 19-23-23-45 CAS Latency
1.35V
Voltage
16GB (2x8GB)
Capacity

Im struggling here, do I up the voltage further?

Thanks,

Paul

geofelt · Mar 22, 2018

Apparently, your processor does not support ram speeds greater than 2666.
Here is the spec sheet.
https://www.intel.com/content/dam/www/public/us/en/documents/datasheets/6th-gen-x-series-datasheet-vol-1.pdf

The best you can do is select a xmp profile at 2666 if there is one, or 2400.
Look for one with lower cas numbers.

You probably paid a price premium for the 4000 speed capability, but that is water over the dam.

Not to worry too much, ram speed usually has a minor impact on actual app performance.
Here is one study:
http://www.silentpcreview.com/article1478-page1.html

If you can, return the ram in favor of a 4 stick kit so you can run in quad channel mode.
You might find that an open incident with corsair might get that resolution out of them.
Particularly if their ram selection app showed that the kit you bought was supported for your motherboard.

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getting higher RAM speeds

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