The placement will probably be much more decisive. Where is your router located and where is the PC? How high is the loss of signal strength due to walls/distance. This can have an influence on the reaction time (ping), which is much more noticeable when gaming (especially shooters).

Yes, because your mainboard has PCI-E and for gaming I would recommend a stronger one (600mbit/s) but it depends on what you are gaming.

Hello, this card was recommended to me by a friend. I don't know if it meets the requirements for uploading and downloading. Streaming videos in high quality works perfectly. And I think the card will also fit on the motherboard. I have installed this card in 2 different PCs without any problems.