VGA error on almost brand new board and GPU

[frozen_sun]

Built the PC in 6/2020..everything was wiorking okay,I was gaming normally when 3 times it happened one long beep followed by 3 short and white LED ON,which indicates problem with GPU.
But after beeps PC boots normally.
Board is Crosshair Hero VIII and GPU Asus Strix 1660 Ti OC.
So what should I do?
Is GPU dying on me?
RMA it?
Today for first time PC rebooted while gaming.
No issues so far while gaming until today.
But those beeps happened this is 3rd time.
Drivers recent,haven't flashed BIOS for board at all,cuz didn't have issues.
Power Supply is great it's HX1200i (brand new).
Everything, all components are purchased new.

[RedSector73]

What CPU, the motherboard has Qcode poster is their code posting.
Do you have NVMe drive in this ?

[Erwin05]

Read this post maybe it works.

https://rog.asus.com/forum/showthrea...-short-signals

[frozen_sun]

Nope no nvme,just SSD.
CPU:3900X
Q-code is changing numbers but as I mentioned to you board boots and I get final AA code which is normal.
it doesn't hang on any code.

[frozen_sun]

Read this post maybe it works.

https://rog.asus.com/forum/showthrea...-short-signals

NO VGA detected,I know but it passes the POST,and boots normally,if no VGA is detected I would get black screen at Power_ON.

[Erwin05]

U can try changing the video card in a different pci slot.
reseat your ram and CLEAR CMOS.
And test your ram with memtest.

Always flash to the latest bios, latest version is v3003.

And always type your full specs on the forum.

[RedSector73]

Are you running CSM module in the BIOS, this should be disabled.

and agree full specifications help us, help you.

[frozen_sun]

According to one guy on other forum,RAM modules are not correctly placed,he wrote me and I quote:
" So for starters, you have mixed matched memory and is mixed in the channels (dual channel 4x sticks)

So one set should go into slots A1 and B1 and the other 2 sticks (set) go in slots A2 and B2. This way one set is in Channel A and the other in Channel B.
Start there. Clear cmos when powered off and reconfiguring.
Just swap the 2 middle sticks A2 and B1.

[frozen_sun]

Are you running CSM module in the BIOS, this should be disabled.

and agree full specifications help us, help you.

How do I check that,and why should be disabled,please explain me,so I want to know?

[Erwin05]

You should never mix memory.

It is advisable to use RAM sticks by the same manufacturer, of the same size, and of the same frequency.

Your problem has noting to do with CSM your problem is that u have installed mix memory.

Best way is to remove 1 pair and by a new pair of the same kind.

CSM explained:
https://rog.asus.com/forum/showthrea...eed-it-enabled