Not able to change RAM timings

I have just installed a new set of 4 x 8GB G Skill TridentX 2400 CL10 memory sticks.
The sticks will only run at 2133mhz 10-10-12-31 no matter what XMP i choose or what numbers I manually enter in bios. And no, they will not run stable with those timings Guessing it must be a motherboard/bios problem?

System:
Asrock Z77 Pro4 Bios version 1.80
I5 2500K running@stock

Just a question: are you trying to overclock the hardware, make it perform faster than designed? RAM will usually "fall back" to slower speeds required by the motherboard but ramping up to faster speeds can be problematic.

I see that 1.80 is the latest BIOS that Asrock has for your board.

Have you tried just using 2 DIMMs? (See your manual: put them in slots A1 and B1, or A2 and B2.) It's possible that the board won't run at the rated frequency with this RAM in all 4 slots.

I don't know why your manual RAM settings aren't sticking. My Asrock MB has a setting on the main screen that allows manual setting, but I see nothing like that in the manual for your board.

Berton said:

Just a question: are you trying to overclock the hardware, make it perform faster than designed? RAM will usually "fall back" to slower speeds required by the motherboard but ramping up to faster speeds can be problematic.

Not at all. I just want my system to be stable again. Have even reset the bios back to UEFI defaults, but it did not help.

Will try with just two sticks and see if it`s possible to change the timings then.

I see. Of all the computers I've built since the Pentiums came out I've not had a problem using the recommended RAM modules and the default settings in the BIOS, but then I've not gotten around to building one from scratch using UEFI. It is possible to have RAM modules that don't work in particular board. My favorite is Crucial.com - DRAM, solid state drive (SSD) memory upgrades for Dell, Mac, Apple, HP, Compaq, Lenovo, Acer, ASUS , only had one problem since '98 and learned that a Dell Dimension 2300 Series did not include a Dell Dimension 2350 computer, different modules, but Crucial didn't quibble about replacing cross-shipment no additional cost, maybe who you got the memory from does the same.

Another thing, when I suspicion hardware issues I boot to a late-version of Linux LiveDVD [usually Mint 17 or 18 or maybe Ubuntu/Kubuntu] and test, eliminates the possibility of the installed OS being an issue or confirms it.

Dell computers are a special breed. Cant really be compared to enthusiast built systems :) My favorite modules are the ones that give highest bang for buck at any given moment
Tried running only two sticks: same problem.
Tried with a set of Corsair Vengeance XMS3 modules 2133mhz 11-11-11-27. Could not adjust timings on those either! So they are also "forced" ro run at 10-10-12-31 with resulting fail at memtest86.

This is bad!

Just "hardcleared" the cmos using the jumper(remember how that used to be a normal procedure), and now I can sett my own timings!
Seems like the I5 memory controller only supports 2133mhz. But maybe I can squeese something on the timings instead :)