Any ideas on why it's maxing out? I actually tried a speed test on my Hackintosh which goes the full 1 gbps... I'm running Sierra on my MP 5,1. Unfortunately, I cannot update to High Sierra on my MP due to critical software compatibility issues. I have a 860 samsung ssd installed on my MP 5,1. --- Post Merged, Dec 7, 2018 --- ok... wtf...? So I just tried the speedtest on chrome vs. safari, and chrome actually shows the full speed.... I'm confused now... are these speed tests optimized for chrome?? I tried the test in the hackintosh via safari and it still showed full 1gbps, as opposed to my MP 5,1 which capped at 400mbit.