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Old 08-24-2016, 04:20 PM
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Default DDR4 RAM boots up as DDR4-2133 - Why is my RAM recognized as DDR4-2133?

Read here to understand memory profiles :

Why does "Max Bandwidth" only show DDR4-2133 (1066MHz)?

As mentioned in the previous thread, the DDR4 standard is DDR4-2133 CL15 1.20V.

This JEDEC standardization allows RAM to be compatible in more types of systems. In other words, DDR4-2400 RAM can work in most DDR4-2133 computers, but only at DDR4-2133. RAM frequency will only operate at the maximum value supported by the CPU and motherboard.

If you have a CPU and motherboard that can potentially support a higher frequency, then a higher frequency memory kit may be capable. The Intel XMP embedded within the memory modules are designed to unleash the performance values of the RAM if the motherboard/BIOS/EFI can support it, and if a capable CPU is used.
CPU capability list - Maximum DRAM Frequency

Each XMP Profile is designed for a specific platform and motherboard, so simply because a motherboard supports XMP, and the RAM has XMP, does not automatically mean the two are fully compatible.

Furthermore, if a motherboard states it can support DDR4-4000, it does not mean any DDR4-4000 RAM can work with that system. Especially for extreme frequencies of DDR4-3000+, it is imperative to use only a certified motherboard from the G.Skill QVL list or the motherboard manufacturer's QVL list. If a motherboard or memory kit is not on the list, you may need to manually input settings, or additionally tweak values to fully stabilize the system to reach the rated specifications of the RAM. In many cases, you may not be able to reach the full specifications of the RAM, hence why it is not on any QVL list. It is possible to get near, but the full specifications should not be expected. It is also possible that a memory kit works flawlessly with XMP and it is not on any QVL list, but that is a chance at your own discretion. Motherboard manufacturers frequently update the BIOS/EFI to support a wider range of RAM, including support for higher frequencies, so it is always best to check for the latest versions when having strange issues or inability to reach the rated specifications of hardware.

To recap, for ideal results:

1. Use a motherboard on the G.Skill QVL list or motherboard manufacturer's QVL
2. Make sure your CPU is capable of the target DRAM Frequency
CPU capability list - Maximum DRAM Frequency
3. Check for the latest BIOS/EFI, verify on motherboard's manufacturer's website
4. If 1, 2, 3 are clear, enable XMP Profile in BIOS/EFI and you should have no problems at all.

If you do have any problems, test one module at a time to see if each stick can boot and work properly.

With both working fine individually, they should be able to work together. In the event a module works fine and the other does not, send them in for RMA exchange and a new kit should work better.
G.Skill RMA

If things get confusing and you can't seem to figure it out, simply contact us via email, NewEgg Chat (on each product page), telephone, post a thread here, Facebook, anywhere we are active and we will be glad to help and make sure your computer is operating at maximum performance.

ustech@gskillusa.com

Last edited by GSKILL TECH; 08-24-2016 at 04:39 PM.
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