AMD A4-5000 can't do gigabit?

[cryogenic666]

I'm currently running OPNsense on an AMD A4-5000 with 4GB RAM and a dual port PCI-E x4 Intel NIC (identifies as 82571EB) and can't get gigabit speeds on my symmetrical AT&T fiber connection. The best I see via the firewall is around 750-800, with upload being higher than down. I've watched CPU usage via Top and it never exceeds 35% so I'm not sure what could be the issue, as I can hit 920-950 with the same PC connected straight to the modem. I'm not running Suricata or any other services outside the norm other than VnStat (and disabling that made no difference). I've also unchecked the boxes to disable Hardware CRC/TSO/LRO in the settings. Anything else that could be the cause of it? I also see astronomical upload bufferbloat (350ms) compared to when connected to the modem directly (15ms).