Getting C5

Need help with my pc. I recently bought a few new parts which are the motherboard, cpu and ram. I set up everything nicely made sure had the cable properly set and clean. When it was time to boot up my pc I get the error code “C5” on my motherboard. But when I run my pc on a single ram it boots up perfectly. The issue is when I run dual channels on channel A2 and B2. I tested out both ram on single channel and they both work perfectly fine. Could it be a motherboard issue? I already did Cmos reset and such. Any ideas?

Pc Specs: Asus Strix x870e DDR5 Corsair Vengeance Ryzen 9 9900x Rtx 3080 ti Psu 850w 3 M.2 SSD