Question RAM frequency issue on ASRock X299E-ITX/ac motherboard ?

[Prism_Sync]

I'll try my best to describe the situation, but the problem is a little complex. Many thanks in advance for helping me out.

Stage 1 (context):

• I have an ASRock X299E-ITX/ac. I was running 4x16GB Gskill RipJaws. Their timing is [C21-21-21-44] at 3200MHz.
• One day they failed to boot, and I confirmed by plugging each single ram into each slot to test them out, turned out to be just one broken.
• I did an RMA and Gskill replaced this ONE ramstick for me.

Stage 2 (context)

• With 1 new stick and 3 old sticks, despite their same timing, the computer cannot run stably at 3200 or 3000MHz. It would typically boot into Windows login screen, but soon goes to BSoD showing various errors, all of which are RAM-relevant.
• if I lower the frequency to 2400MHz, the system stably runs with all 4 sticks.
• If I install any 2 from the 3 old memory sticks, they can run at 3000MHz no problem. Given these obervation, I speculated there was some incompatibility between the old/new batches of ram, so I requested RMA to replace the whole set of 4.

so far everything made sense to me. Memory sticks can break, and diffrrent batches may not run together well. Fine.

Stage 3 (Problem now):

• I needed backup ram during the RMA when the 4 rams are all gone, so I purchased two Corsair rams, and their timing is [22-22-23-53] at 3200MHz and you notice the delay is sightly higher than Gskill's.
• The first time I plugged in both of the Corsair, the system boots ok, and they run at 2400MHz. For curiosity (I regretted) I restarted into BIOS and selected the XMP profile, hoping they'd run at 3200MHz, but since then the system does not post at all. No display output of any kind, no bios, only fan spins.
• I tried restarting several times, same problem. some motherboards would roll back to last working setup, but mine doesnt seem to do so.
• I unplugged the power, held clear-CMOS button for 15sec; still cannot post, no display of any kind.
• Now, if remove all Corsair rams and plug in a Gskill ram, the system finally goes into BIOS. It does tell me ''default had been loaded due to power cutoff'', so the clear-cmos operation was corretly done.
• I reset everything to ''auto', such as memory frequency, hoping it'd be able to accomodate the Corsair, but when I shut down, replace the gskill with Corsair, still no post.

I'm confused because the Corsairs booted once at 2400MHz, so they must be compatible at least at this frequency. However, the system cannot boot anymore even if I have cleared the cmos. Here are some questions:

1. Are the DRAM settings, such as targe frequency, I set with Gskill installed ''carried over'' when I replace them with Corsair? I set it to 2400Mhz, what Corsairs once worked at, but no luck.
2. there was option of XMP profile where I tried 'auto' and 'none', but neither worked.
3. The only possible explanation I'm thinking is that, the system somehow tries to run the Corsair at Gskill's timing, so they cannot post. But how?
4. Can a ram work if the motherboard is set to a timing higher than the ram's profile? for example a C21 ram with a motherboard set to C22?

I've tried quite some methods and is desparate right now. I genuinely appreaciate any troubleshooting advice or possible explanation. Thank you so much!!!

Here are spec of my computer
CPU: Intel i9-10920X
CPU cooler: Thermalright Prism 240
Motherboard: ASRock X299E-ITX/ac (BIOS ver. 2.20)
SSD/HDD: Micron 9200Pro 3.84TB (system), Samsung PM983 1.92TB, Samsung 980Pro 2TB
GPU: Asus RTX 3090 TUF
PSU: Corsair SF750. Been used 3yrs 6 month now.
Chassis: Custom made ITX (Sunmilo Studio)
OS: Windows 10, 22H2
Monitor: HP X34 (Using DP)

 

[Lutfij]

Welcome to the forums, newcomer!

Now, if I plug in one of my Gskill ram, the system finally goes into BIOS.
This tells me that you're mixing and matching rams on your build. Is that so?

BIOS version for your motherboard at this moment of time?

+
When posting a thread of troubleshooting nature, it's customary to include your full system's specs. Please list the specs to your build like so:
CPU:
CPU cooler:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:
Monitor:
include the age of the PSU apart from it's make and model.

 

[Prism_Sync]

Welcome to the forums, newcomer!

Now, if I plug in one of my Gskill ram, the system finally goes into BIOS.
This tells me that you're mixing and matching rams on your build. Is that so?

BIOS version for your motherboard at this moment of time?

+
When posting a thread of troubleshooting nature, it's customary to include your full system's specs. Please list the specs to your build like so:
CPU:
CPU cooler:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:
Monitor:
include the age of the PSU apart from it's make and model.

Thank you for your reply!

Sorry for the ambiguous statement. I meant ''unlugging the Corsair, and only installing 1 Gskill on there, and the system can boot''.

I'm updating the specs in the main post so others can see directly.