Error code C5 indicates a memory issue in the Q-Code system.
Error code C5 indicates a memory issue in the Q-Code system.
Hello! I assembled a new PC using these components: motherboard ASRock X670E Taichi, CPU AMD Ryzen 9 9950X, RAM NEMIX RAM ME44800-328K2-GX (two 32GB DDR5-5600 CL40 at 1.1V ECC), power supply Corsair HX1200i (1200W), and an AIO Arctic Liquid Freezer III 360 ARGB Black. The system boots only with both RAM sticks in channel B, specifically slots B1 and B2. When using either A2+B2 or A1+B1 for dual-channel configuration, I encounter the "C5" Q-Code error and fail to access the BIOS menu. I'm currently running the latest BIOS version (3.06). Any suggestions for troubleshooting?
Running a stick only at A2 can cause issues. If it doesn’t boot, you likely have a dead memory channel. This could mean a dead motherboard, a faulty CPU memory controller, or a bent/dirty socket pin. I’d reinsert the CPU and inspect the pads and pins for bends or debris. If that doesn’t work, I’d consider returning the product via RMA, as that’s more probable.
Hello! The problem has been resolved. I purchased a different RAM kit. Summary: It wasn't a dead channel, CPU or motherboard issues, or faulty RAM. The cause is an incompatibility with the existing system. This specific kit only functions in channel B with DIMMs placed in B1+B2. Placing any single module elsewhere or using other configurations results in the same error "C5". My advice: Avoid buying RAM kits not listed on the QVL!
Hey everyone, I faced the same problem with my Asrock B650 Taichi setup. It had two 32GB RAM modules at 6000MHz CL30, totaling 64GB, and a 9800x3D chipset. Initially, only one memory module showed up, which was what the original poster suggested. I was really stressed about it. In short, the fix came from reducing the pressure on the CPU cooler interface. I gradually removed the four screws until the C5 error disappeared and the system booted into BIOS, allowing me to see both RAM sticks.
I learned this by checking for bent pins on the motherboard and trying to reinsert the CPU without the AIO cooling unit. After that, I avoided placing the AIO on top during testing. I used a cheap air cooler I had on hand and simply mounted it directly over the CPU without any screws. When I powered on the PC, both RAM modules were recognized.
In the end, it was the difference in mounting pressure—no screws, just direct contact—that resolved the issue. Thanks for the tips! Have a great holiday everyone.
I chose to purchase motherboards with backplates to prevent any bending issues.