B450 gaming itx/ac 3200 XMP not working with LPX
Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=12156
Printed Date: 01 Nov 2025 at 3:04am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: B450 gaming itx/ac 3200 XMP not working with LPX
Posted By: section94
Subject: B450 gaming itx/ac 3200 XMP not working with LPX
Date Posted: 09 Aug 2019 at 5:28pm
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I built my first mini-itx system and went with this board because it supposedly had better a VRM than the other mini-itx boards in my local market. I took the Ryzen 1700 and Corsair LPX 3200 memory from my main rig which I upgraded to a 3700X and Patriot RAM and put them on the mini-itx. It was working perfectly on that system at it's rated 3200 XMP profile with the Crosshair VI hero. So basically I took the CPU and RAM out and put them in the mini-itx system not even thinking that the RAM might not work at rated speeds considering its a second gen board without (in theory) the Ryzen memory speed issues of first gen. I was extremely disappointed to find out that I cannot run the XMP profile on the new system. It just refuses to boot with anything above 2933 which is not terrible but I bought a board that advertises 3466+ speeds! And it cannot hit 3200 with one of the most popular Corsair (if not THE most popular) RAM kits? That's just insane! I spent 2 days tweaking timings and voltages using the DRAM calculator for Ryzen trying to get it to work manually but nope...it just doesn't boot with anything above 3000. The kit is the CMK16GX4M2B3200C16. It's has Hynix AFR dies. I know it is technically not in the QVL list of the board (it wasn't on ASUS' X370 CH6 QVL either but it worked fine there) but that is no excuse for a simple 3200Mhz XMP not working on a second gen board, more than a year after its release. Sorry if I sound pissed off. It's because I am! Is it reasonable to expect a bios update that improves memory support a year later? Sorry for the long, ranty post. |
Replies:
Posted By: marsovac
Date Posted: 29 Oct 2019 at 10:53am
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Can you tell me if this memory works on this board with Ryzen 3000 (since you own it)? I have the same problem with Ryzen 2600. It cannot run XMP, works at 3000Mhz max, but at that 3000MHz it works at CAS14. Modules are 2 double sided 16GB Corsair Vengeance LPX sticks for 32GB in total. Typhoon says: Module Manufacturer: Corsair Module Part Number: CMK32GX4M2B3000C15 Module Series: Vengeance LPX DRAM Manufacturer: Hynix DRAM Components: H5AN8G8NAFR-TFC DRAM Die Revision / Process Node: A / 21 nm Module Manufacturing Date: Undefined Module Manufacturing Location: Taiwan Module Serial Number: 00000000h Module PCB Revision: 00h Here are my CAS14 stable settings with all timings tighter than stock XMP: CAS Latency (CL) 14T RAS To CAS Delay (tRCD) 16T RAS Precharge (tRP) 17T RAS Active Time (tRAS) 30T Row Cycle Time (tRC) 56T Row Refresh Cycle Time (tRFC) 448T, 2x Fine: 390T, 4x Fine: 240T Command Rate (CR) 1T RAS To RAS Delay (tRRD) Different Rank: 16T, Same Bank Group: 30T, Diff. Bank Group: 14T Write Recovery Time (tWR) 24T Read To Read Delay (tRTR) Different Rank: 5T, Different DIMM: 5T, Same Bank Group: 4T, Diff. Bank Group: 1T Read To Write Delay (tRTW) 12T Write To Read Delay (tWTR) 2T, Same Bank Group: 12T, Diff. Bank Group: 4T Write To Write Delay (tWTW) Different Rank: 7T, Different DIMM: 7T, Same Bank Group: 4T, Diff. Bank Group: 1T Read To Precharge Delay (tRTP) 10T Four Activate Window Delay (tFAW) 32T Write CAS Latency (tWCL) 12T Write RAS To CAS Delay (tRCDW) 16T |
Posted By: marsovac
Date Posted: 29 Oct 2019 at 10:58am
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BTW from the Pinnacle ridge memory support there is only one DS (Double sided) module certified at 3200 MHZ. Which is the ADATA 16GB AX4U3200316G16-SGZ At least there is not a fault of the memory lanes to not be able to support double sided 3200. But they should update the BIOS to work with more sticks! |
Posted By: gizmic
Date Posted: 29 Oct 2019 at 11:31am
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no doubt corsair is a popular brand but this is for its highend series you should input it manually instead of complaining why xmp is not supported ------------- 
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Posted By: marsovac
Date Posted: 29 Oct 2019 at 1:04pm
You are not helpful at all. Inputting XMP timings makes no difference unless the memory speed is lowered to 3000Mhz. This board has problems with double sided memory and seems to cap most on 3000. There is only one doublesided 3200 module that reaches 3200 in the QVL. Compatibility for DS memory should be improved. |
gizmic wrote:Posted By: gizmic
Date Posted: 29 Oct 2019 at 1:18pm
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what does manually inputting the xmp values do you'll get the same results run ryzen dram calculator and see what values if gives you and test from there basically trying to run xmp that arent tuned for ryzen is a long shot dual rank run perfectly fine on ryzen assuming they are ryzen certified -------------
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Posted By: section94
Date Posted: 30 Oct 2019 at 7:09am
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Copy paste from the same post I made on toms. In short PLAY WITH SECONDARY TIMINGS TOO: I finally managed to get it to work at 3200. I downgraded to bios 1.70 after contacting asrock support and following their instructions as they said it is the best bios for 1st gen Ryzen. They also recommended increasing RAM and SOC voltage but none of those helped. The problem was actually in the sub-timings that the XMP profile sets, not in the 3200mhz clock speed. The Tras value that it was trying to set was too aggresive (54) and the board was not liking it. Setting it to 57 got me up and stable with all other XMP settings untouched. Primary timings were never an issue and I can boot even with CL 14 (altough I dont trust it for 24/7 stability). So as a general FYI, if you cant get an XMP profile to work take a look at the timings on your bios as XMP profiles can modify the sub-timings too, not only the primary timings. It might be just a single value that prevents it from working. Finally happy and stable at 3.9 Ghz @1.375 Volts and 3200mhz CL16! |
Posted By: section94
Date Posted: 30 Oct 2019 at 7:22am
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Correction on above post: I meant the trc value not tras ?? |