Intel Motherboards : Dual Channel Issue

Author: seanp2500
Subject: Dual Channel Issue
Posted: 20 Jun 2020 at 8:17am

Hi. My problem is with latest 10gen intel cpu when using z490 steel legend I cannot boot into bios with ram sticks inserted in A2 B2 or A1 B1. I can insert sticks into A1 A2 and they can load windows and work fine with XMP profile as single channel. I have also confirmed these ram sticks are on the approved list for dual channel. So far I have replaced PSU. I am thinking of RMA motherboard but it seems to me like some sort of bios or compatibility issue. Another set of DDR4 ram sticks show same symptoms. Here are my specs

Motherboard ASROCK Z490 Steel Legend     
BIOS Version: 1.20
CPU:Intel Core i7-10700 8-Core 2.9 GHz LGA 1200 65W BX
Memory: first i tried Patriot Viper Steel 16GB (2 x 8GB) 288-Pin DDR4 Then I switched to: Corsair Vengeance RGB Pro 16GB (2x8GB) DDR4 3600 (PC4-28800) C18 AMD Optimized Memory ??Black, Model Number: CMW16GX4M2Z3600C18
Video Card:980ti,PCIe (behavior same without card inserted)
HDD: ST1000LX015-1U7172,SATA
ODD:ASUS BW-12B1ST,SATA
OS:Windows 10 64-bit