I'm not sure there was a strap for the memory on those boards. I had (still have actually) a DFI lanparty SLI-DR. If I recall, my poor hynix memory was the reason I could only get my opteron 165, and the previous single core (3000+ ??) to 2.7ghz.
Asus Crosshair VI Hero 370 motherboard
AMD 3600x cpu @ 4425mhz with Arctic 240 aio
Powercooler 5700XT Red Devil video
Ballistix 4x8gb ram @ 3800mhz/1900 IF
Samsung 970 Pro NVMe M.2 ssd
Corsair 750 power supply
MSI 34" 3440x1440 curved monitor