BIOS Concerns About My New PC Build
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=99013
Printed Date: 31 Oct 2025 at 5:31pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: BIOS Concerns About My New PC Build
Posted By: Seraph.official
Subject: BIOS Concerns About My New PC Build
Date Posted: 24 Feb 2025 at 8:33am
My new (and first) PC build in the modern era consists of:
Motherboard: ASRock X870e Taichi Lite
CPU: AMD Ryzen 9 9950X - Ryzen 9 9000 Series Granite Ridge (Zen 5) 16-Core 4.3 GHz - Socket AM5 170W - Radeon Graphics
RAM: CORSAIR - VENGEANCE RGB 32GB (2x16GB) DDR5 6400MHz C32 AMD EXPO & Intel XMP UDIMM Model: (CMH32GX5M2B6400Z32)
Storage: 1x SAMSUNG 990 PRO 2TB SSD, PCIe Gen4 M.2 2280, Seq. Read Speeds Up-to 7,450MB/s (with plans to get a second)
Cooler: Razer Hanbo Chroma RGB AIO Liquid Cooler 360MM (aRGB Pump Cap), Intel LGA 1851/1700/1200 & AMD AM4 & AM5 Compatible
GPU: ASUS GeForce RTX 4070 Super 12G ProArt OC Graphics Card - 2565MHz Boost Clock, GDDR6X, PCIe Gen 4, DLSS 3, HDMI 2.1a, 3 x DisplayPort 1.4a (Supports 4K & 8K HDR)
PSU: Corsair RM1000x Fully Modular ATX 3.1 (Cybenetics Platinum, Cybenetics A)
OS: Microsoft Windows 11 Home (64-Bit)
Chassis: Montech AIR 903 MAX, E-ATX Mid Tower Case, High Airflow, 3X 140mm ARGB PWM & 1x 140mm PWM Fans Pre-Installed, Tempered Glass Side Panel, Mesh Front, Type-C, Support 4090 GPUs, Black
Monitor: GIGABYTE - GS27QC - 27" VA Curved Gaming Monitor - QHD 2560x1440 - 165Hz/OC 170Hz - 1ms MPRT - AMD FreeSync Premium
My concern is with the 3.18.AS02 [Beta] BIOS update, which is the latest that seems to be compatible with the 9950X. Based off what I've read, I'm not sure if I should immediately BIOS flashback to 3.18.AS02 [Beta] (which hopefully wouldn't end up bricking the motherboard), keep the current BIOS that shipped with the motherboard or even roll back to a previous version to avoid certain issues. Given what's I've seen on the RAM compatibility list, my CMH32GX5M2B6400Z32 model RAM has the same specs as the CMH32GX5M2B6000Z28 (which seems to be compatible), however the CMH32GX5M2B6400Z32 isn't listed as compatible with the X870e Taichi Lite and the CMH32GX5M2B6000Z28 seems to be sold out at the same or similar specifications. Based on what the manual says, the RAM works best with one RAM stick on B2 or two sticks on B2 and A2 in dual-channel mode.
There are better options out there, though does anyone know if the CMH32GX5M2B6400Z32 would still work with this setup?
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Replies:
Posted By: eccential
Date Posted: 24 Feb 2025 at 6:44pm
According to https://asrock.com/mb/AMD/X870E%20Taichi%20Lite/index.asp#CPU" rel="nofollow - https://asrock.com/mb/AMD/X870E%20Taichi%20Lite/index.asp#CPU
9950X is supported from 3.05, which was the initial release. So it should just work, out of the box.
Since it should work out of the box, there's no reason to use flashback function. It's generally better to use BIOS built-in function (Instance Flash?) if you can get into BIOS.
I personally don't see an issue with running the latest beta BIOS. I'm running the latest beta on my B850M-X [WiF] with 9800X3D just fine.
As for RAM, technically, AMD only recommends upto 6000MT/s. Even then, I'm not sure if AMD guarantees that FCLK can run 1:1 at that speed, as their official support limit is 5600MT/s for 9000-series. I'm the wrong person for that stuff anyway, as I basically NEVER buy any "gamer" RAM. I only buy standard JEDEC spec ECC UDIMMs, like the Micron's 5600MT/s ones I'm using now.
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Posted By: Seraph.official
Date Posted: 04 Mar 2025 at 8:44am
Thank you for the prompt response! I just finished my build officially yesterday after getting the wifi-7 working after a simple WLAN driver update.
My particular motherboard shipped with BIOS 3.15 and I've decided to keep the RAM speeds at 4800 MT/s out of the box, since I haven't noticed any performance dips anywhere during monitoring and no issues at all booting into BIOS or installation of the PC overall.
Also, despite my RAM specifications not necessarily being on the compatibility list for the motherboard, it is in fact compatible with it out of the box.
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