New Build - memory running at Wrong Speed

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   Memory = 32 gig Z370 Desktop Memory Model F4-4000C19D-16GTZSW
Motherboard = ASRock Taichi Ultimate
CPU = i9 9900K

As you can see above the memory I purchased is rated at 4000.  When I try to enable XMP Profile 1 - my system will not boot.  This module model number is on the ASRock supported list.  I have installed the latest bios dated in December 2018.  

Can someone please help me - how do I overclock the RAM to 4000 and stable ?

Thanks,
Tony

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golfcart22 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 03 Jan 2019 Status: Offline Points: 9	Post Options Post Reply Quote golfcart22 Report Post Thanks(0) Quote Reply Topic: New Build - memory running at Wrong Speed Posted: 11 Jan 2019 at 4:00am
	Memory = 32 gig Z370 Desktop Memory Model F4-4000C19D-16GTZSW Motherboard = ASRock Taichi Ultimate CPU = i9 9900K As you can see above the memory I purchased is rated at 4000. When I try to enable XMP Profile 1 - my system will not boot. This module model number is on the ASRock supported list. I have installed the latest bios dated in December 2018. Can someone please help me - how do I overclock the RAM to 4000 and stable ? Thanks, Tony

ASRock_TSD Members Profile Send Private Message Find Members Posts Add to Buddy List ASRock_Official Joined: 20 Mar 2015 Status: Online Points: 8907	Post Options Post Reply Quote ASRock_TSD Report Post Thanks(0) Quote Reply Posted: 11 Jan 2019 at 10:11am
	Dear Golfcart22, Thank you for choosing ASRock. Regarding your case, please install your memory module at A2, B2 slot to try. If still doesn't work, please install one stick memory at A2, B2 slot to check each memory module can work at XMP 4000. Thank you! Yours truly, ASRock TSD

steveg Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 09 Mar 2018 Status: Offline Points: 15	Post Options Post Reply Quote steveg Report Post Thanks(0) Quote Reply Posted: 15 Jan 2019 at 11:35am
	ASRock has an issue with their implementation of XMP. This is unfortunately a common issue (despite using memory on their tested list). If you search down this board it is reported again and again. You can experiment but the issue is not transparent and your mileage may vary. I have used two different sets of memory, both on the appropriate lists, and could get neither of them to run in XMP. I was able to get my 4000mhz to run at 2800 and my other set (3200) at 2666 and basically I have given up trying to get anything better. If they do some fixes to their bios I may try again.

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 27848	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 15 Jan 2019 at 2:31pm
	DDR4 RAM compatibility has been a nightmare and not just with ASRock boards. The issues are three fold: 1. The IMC (Integrated Memory Controller) is located on the CPU 2. RAM specs and design 3. BIOS support The motherboard manufacturer is only in control of one of those elements and even then, only partially. The core BIOS (prior to optimization/alteration for multiple product variations) is provided by intel/AMD. Board partners have gotten pretty clever with their ability to tweak and optimize these BIOS releases to improve compatibility etc but by and large, most of these "tweaks" are just doing what a more savvy user would do, increase voltages, loosen timings etc. For proper "improved support" the core BIOS needs to be updated, that is contingent on intel/AMD. DDR4 has been the worst for these issues thanks to the fact that we have seen 3 entirely unique platforms launch over a it's lifespan, X99 (HEDT, Quad Channel) then Skylake (dual channel) then later, Ryzen and Threadripper (Dual and Quad Channel repectively). With each new platform we saw huge compatibility issues, slightly less so from x99 to skylake but only because faster DDR4 kits were still in their infancy at the time, DDR4 2133 was still commonly used. Here's hoping DDR5 will be more forgiving