Replacing on board NIC

[Jim Byrnes]

Running Ubuntu 14.04.

I recently upgraded my internet speed to 150 mbps. On my HP desktop I 
only get 1/3 of the speed advertised.

00:0a.0 Ethernet controller: NVIDIA Corporation MCP77 Ethernet (rev a2)
	Subsystem: Hewlett-Packard Company Device 2a81
	Kernel driver in use: forcedeth

On my HP laptop I actually exceed the advertised speed.

00:19.0 Ehternet controller: Intel Corporation 82579LM Gigabit Network 
Connection (rev 04)
     Subsystem Hewlett-Packer Company Device 18df
     Kernel driver in use: e1000e

I ordered a Intel Gigabit CT PCI-E Network Adapter EXP19301CTBLK for the 
desktop.

1. Do I need to disable the on board nic before installing it?

2. What will I need to do about a driver?

Thanks,  Jim