network cards

Hi, We have 500Mbps fibre broadband. To my Shuttle SH570R8 PC, hard wired to ethernet card, I often get high 500s, down and up To a PC downstairs (MS Surface Pro 4), connected to a USB 3.0 Gigabit adapter, 500 every time, down and up, But on my wife's laptop, connected to a USB 3.0 Gigabit...

Sandy bridge Pentium but Im Lagging pretty badly during downloads of Just cause 4 and star wars battle front 2. Is my Networking card too slow or The load too High ( i don't know what model of a network card but it only supports 2.4Ghz networks) please Help.

i brought a second hand board that had been painted white and i want to remove the paint safely without damaging the board Pics are as follows https://plus.google.com/collection/oEV2LF

So i currently have a phanteks p400,but because I cant place my h115i cpu cooler at the top,and only the front allows it.I absolutely hate it and it affects my temps.So I recently found a second hand corsair air 540[local].Which costs the same as the price when i bought the p400.However there...