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I'd already tried everything from 1.05-1.20 for both.

I finally gave up and cleared CMOS, ran with the default settings, and was still crashing at 2666 MHz, so, I bit the bullet and swapped...

Scratch that -- back to crashing.

Another update! Matching Min CPU Cache Ratio to Max CPU Cache Ratio (48 in my case) appears to have fixed the issue with light workloads. Possibly a useful datapoint for the engineers at ASUS?

I take this back. I'm now able to complete stress tests at 4000 16-19-19-39 with my Ballistix 3600 16-18-18-38 32 GB kit, but the system randomly crashes and powers off when performing light tasks...

An update: BIOS 0704 fixes the issue for me. It's too bad that it hadn't been mentioned in this thread yet -- it's been available in the forums for 11 days.

"(Updated some vrm porting, dram...

My Z490-I has this issue as well. The BIOS shared in this thread didn't help, and ASUS advised me to return the motherboard to the retailer. Can we please get an update from the engineers that are...