OEMPCWorld.com: RAMCHECK LX base tester, includes universal 240/100VAC switching power supply.
Plastic Ram Tester, 40 W
Amazon.com: Nice DDR4 Desktop PC Server Memory RAM Module and Computer Motherboard RAM Slot Easy Test Quick Diagnostic Analyzer LED Tester Card Complete Set Solution Kit 288 Pin All Speed Voltage ECC
RAM check. Which one is better for a 7950X3D? : r/overclocking
RAM test for DDR memory
PassMark Software - ECC Tester
How to Test RAM with Windows Memory Diagnostic | TechRepublic