Fallout New Vegas ftw it's more fun imo, maybe cos in Fallout 3 I just used to go to Mothership Zeta and Operation Anchorage as soon as I completed the first quest.
BSODs, mostly from Cpu voltage being too low lol, Gpu is usually the same if you oc clock and memory speeds too high then the drivers keep crashing basically what Mattrixx said
It depends on your location, if you have copper wiring or fiber optic wiring, Your ISP, if your ISP throttles your download speed and if the card is 1000Mbps, then yeh you can run it at 125Mbps.
10/100/100 is the max speed of the network card eg 10 Megabits / second, Computers connect to a router that obtains a local IP address, then the router sends a request to get an Internet IP address. 800mbps does equal 100Mbps