Unless that happens when you're gaming, you don't need to worry about having the GPU underclock, it's only to save power.
I can't help you on the 8x-16x problem, though i suspect that that's also a power saving measure.
Your memory is lower than advertised because, just like hard drives, it's almost impossible to get the full amount of advertised memory. My 2gb card has 1800 MB of memory.
The clock speed of your card, just like most of the other problems, is because of your laptop attempting to save power, my battery life would be cut in half just by having my card on all the time.
Try running a game (preferably a demanding one) on your computer while it's plugged in, then run all the tests. If the problems aren't solved, then I can't help you.