"I set up all the drivers and installed everything to the latest drivers through the amd site, but when I check my video card, it only says 6900 series"
It doesn't need to differentiate as the driver is for the entire 6900 series. Don't worry you have the right driver.
"when I go onto canurunit, it says I only have 752.1mb instead of 1gb"
Canurunit is unreliable. It drops a file onto your computer and tries to assess your computer's performance. Innacurately. Go to 'yougamers' and it will say different, as it analyses your actual hardware.
"Lastly the temp for my 6950 doesn't show up on speed fan."
Download GPU-Z (google it) install and run. Under the sensors tab will be given the temperature. If that doesn't display - there may be a problem with the sensor. But try that first.