I have a 10gb NIC in my PC. I ran a cat 6a cable from the ONT directly to my PC. I can only get around 1200 to 1300 on the sonic speedtest. Is it possibe my PC isn't powerful enough? (Asus z170 with I7 processor and ssd OS drive.)
I don't think the z170 has a built-in 10 Gbps adapter. Did you use a PCIe adapter or on USB ?
What are you using for testing bandwidth, only the sonic speed test?