Ethernet Speed lower than it should be

[wado729]

Here's my build
OS: 10.13.6
CPU: i7-8700k
MB: MSI Z370i Gaming Carbon AC
RAM: 16 GB DDR4 Crucial Ballistix

My internet chipset is Intel I219-V Gigabit LAN controller and I am using version 2.4.0d0 of IntelMausiEthernet.kext.

I am paying for gigabit down speeds but I am not getting on my hackingtosh. My windows work CPU gets speeds up to 900mb/s but my hackintosh tops out at around 490-510mb/s. It's been like this on 10.13 and 10.13.6. Both machines are not using wi-fi when testing speed, they are both going straight into my router.

Anybody else have this issue?