What do you mean by "internet card"?
ASUS Rampage V Edition 10 driver downloads siteThe R5E10 has two Gigabit Ethernet/LAN ports (I218-V and I211-AT). You can download drivers for these directly from Intel -
https://downloadcenter.intel.com/product/71305/Intel-Ethernet-Connection-I218-Vhttps://downloadcenter.intel.com/product/64404/Intel-Ethernet-Controller-I211-ATR5E10 also provides a dual-band 2T2R 802.11a/b/g/n/ac WiFi ("2x2 PCE-AC68"). You cannot download AC1900/BCM4360 drivers directly from Broadcom and basically must use whatever ASUS or Microsoft (Windows/WHQL) provides.
You should prefer the wired LAN ports for best internet connection and performance. If you're running wireless then intermittently slow/unstable connections are unavoidable (although you might be able to reposition or upgrade your WiFi antenna to improve signal a little).
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