Question on ram overclocking

I had a delidded (with liquid metal) 6700k running at 4.8ghz on a z170 Gaming 7 motherboard with 2x8gb Team ram. XMP put it at 3000mhz c16 with everything on auto.

I picked up a z270x Gaming 8 motherboard (no real reason for it, just liked the looks better) and swapped my 6700k and ram over. Took the opportunity to upgrade some of my watercooling gear too while it was down.
*Side note if it matters - in between the Gaming 7 board amd Gaming 8 board, the ram was in a Ryzen build while I waited on new ram for the Ryzen setup. It ran for a few days on that build before going in the Gaming 8.

With the new setup up and running, I overclocked the 6700k to 4.9ghz at 1.4v (4.7ghz uncore) with temps max at 58 degrees on p95. Passes several bench tests and games flawlessly. Seems 100% stable. Went to add in the xmp profile for ram, would not boot at all. Decided to reset everything to default and try just ram. Still would not boot xmp at stock cpu settings. To go above 2666, I'm setting dram to 1.4v and timing to 20-20-20. This is with stock cpu settings too.

Any ideas on what to try?

Reduce your CPU overclock 100MHz and see how fast the ram will run then.
One limits the other.

Nenu said:

Reduce your CPU overclock 100MHz and see how fast the ram will run then.
One limits the other.

Click to expand...

I can't get it to hit the rated 3000mhz/c16 even on the stock 4.2ghz cpu clock now. On the old setup, it had zero issues with my overclock on.

Its possible your new board is lower quality (ie has less layers).
If your ram isnt on its qvl this could explain why it cant match the rated speed.

I had the same issue with my first 2 Z170 boards, my 3000MHz C15 ram wasnt stable above 2600MHz and wasnt on the QVL of either board.
It wasnt until I went mid/high end mobo (with more layers) my ram would reach its rated 3000MHz C15 and now overclocks to 3733MHZ C17 at 1.44V.

First thing to check is whether you have the latest bios.
They fix ram compatibility issues in updates.

Nenu said:

Its possible your new board is lower quality (ie has less layers).
If your ram isnt on its qvl this could explain why it cant match the rated speed.

I had the same issue with my first 2 Z170 boards, my 3000MHz C15 ram wasnt stable above 2600MHz and wasnt on the QVL of either board.
It wasnt until I went mid/high end mobo (with more layers) my ram would reach its rated 3000MHz C15 and now overclocks to 3733MHZ C17 at 1.44V.

First thing to check is whether you have the latest bios.
They fix ram compatibility issues in updates.

Click to expand...

I'm pretty sure my board is up to par quality wise, and at the very least it is no less quality than my previous board (went from a Gigabyte Gaming 7 to a Gigabyte Gaming 8).

I'm on the current bios, I updated that as soon as I installed the board. I suppose I could roll back a revision or 2 and see if the newest one is the problem.