[操作疑難] LAN卡問題

新手問題多問,最近換左底版用INTEL .
我用INTEL onboard  LAN上網發現開圖明顯快左,

1.想問下其實有咩分別底版LAN同插卡LAN其實主要有咩分別.....
2.Z97-DELUXE果兩個LAN接口有咩分別.
3.Z97-DELUXE LAN 係用CUP定係行Intel® Z97晶片.
4.如果CUP滿負載既時候Broadcom 5721 PCIeX1定onboard Intel LAN比教好

現有
Broadcom 5721 PCIeX1

Z97-DELUXE onboard LAN卡
Intel® I218V, 1 x Gigabit LAN, Dual interconnect between the Integrated Media Access Controller (MAC) and Physical Layer (PHY)
Intel® I211-AT, 1 x Gigabit LAN Controller(s)
Gigabit Intel® LAN Connection- 802.3az Energy Efficient Ethernet (EEE) appliance