Re: Maybe DDR4 SDRAM dual memory cards are not compatible with the GDDR6 graphics card. have you tried put the two memory sticks in slot 1 and 3 (black and white or different color slots)?
I had the same problem with the 2 Blinking Amber Lights, pause, and 7 Blinking Amber lights indicating a memory failure from the attached list which I appreciate the list. I had 2 x 8-GB memory cards installed in DIMM 1 and 2 (16 GB total). I removed both and installed one at a time in DIMM 1 slot and found both memory cards worked well with improved pc performance with only one. My Dell G5 5090 desktop seems to have a problem with both memory cards installed in DIMM 1 and 2 slots even though I have a medium graphics card installed being 490-BFJL: NVIDIA GeForce GTX 166007i 6 GB GDDR6. Maybe DDR4 SDRAM dual memory cards are not compatible with the GDDR6 graphics card. My solution, doubtful whether correct, is to leave one of the memory cards out as it seems to work well without freezing and performance better. Wish Dell techs could confirm as Bios diagnostics always says everything is OK although a few time the pc froze during the lengthy test (3 hours).
G5 5090 memory compatibility with video card