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is 4266MHz memory possible on X299?

Nov 2, 2013
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System Name Auriga
Processor Intel i9 7960X @ 4.5GHz w/ EK nickel-plexi Supremacy EVO
Motherboard ASRock Fatal1ty X299 Professional i9 XE
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Memory 4x 8GB G.SKILL TridentZ 3800MHz 16-16-16-36 RGB
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i got a good deal on some G.Skill memory that i know runs fine on a 9900K at XMP speeds. it's this kit here: https://www.gskill.com/product/165/299/1552459520/F4-4266C19D-16GTRGTrident-Z-RoyalDDR4-4266MHz-CL19-19-19-39-1.40V16GB-(2x8GB)

i can get it to run at 3800MHz, but not any faster than that, on a 7960X and asrock X299 pro i9 XE. i looked around the net and it seems like this platform doesn't like fast memory. what can i try to get this memory to run at XMP on my X299 set up



Super Moderator
Staff member
Apr 12, 2006
26,763 (5.45/day)
System Name His
Processor Intel i9 7920X
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Typically to hit that sort of speed on x299 you need the 7740x to get it done. My 7920 and 7800 top out similar to your findings.

I say try to lower the timings at 3800, the performance gains aren't awesome enough to drop a ton of volts to get to 4266.
Dec 31, 2009
15,361 (4.33/day)
You may have better luck on an X299 ITX board... but likely still need the 7740X and its dual channel IMC versus the quads.

Unless your application can benefit from the additional bandwidth, I would stick with 3600 on that platform. :)
Last edited:


Dainty Moderator
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Aug 16, 2005
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I tend to agree with the others. Bumping ram on this platform is absolutely brutal.