Hi there

can you NETWORK between two machines at 1GB - without the internet working but still going through your router (just disconnect from the Internet).

If you can't get a LAN connection of 1GB then you won't get an Internet connection of that speed.

If you DO - can you plug a computer DIRECTLY into your router / cable and check Internet speed.

Note also writing to slow HDD's will give a false indication of speed anyway - I can't think of any home grade computer with consumer grade HDD's that will give you a constant data transfer of 1GB/s anyway. Some SSD's might - but the chances are the MOBO's bus speeds will be of at least an order of magnitude slower.