hi -joe-, just don't worry too much.
whether it's a windows 7 or windows 8, it's no so much of a problem to make them run nicely. as long as you run the laptop with the drivers from ASUS (and stock windows), there should not be a problem to retain the functionality (whether it's about the GPU or other components).
to answer your questions:
1. My G75 came with Win8 preloaded, is it going to impact the performance of the graphics if I lose the Optimus(?) by switching to Win 7?- optimus is about power saving. that means you can use your laptop for longer time on battery. it's useful only when you do anything without heavy loads. this is however not true if you play games. playing games consume a lot more power than the battery can handle, thus we always recommend that you play games when plugged in to an external power source to ensure optimal performance.
to be frank, i prefer optimus disabled (and i hope it stays disabled the next time i buy one of these machines).
2. I bought the tech support from BB because they said the HDD to SDD was covered if I did it there. Does this sound fishy to a1nyone? Seems ify to me now.- well, it's good to have supports if you can afford it.
3. If I just drop two OCZ ssd's in and run Win 7 pro, will it recognize all the hardware, and will the graphics card that supposedly was modified by asus, still function in concert with the onboard graphics?- i am running ocz vertex 3 and 4 in my g55. so far so good
🙂 optimus will likely be disabled if you use drivers from geforce, but i don't think that's a problem. we old model owners have survived without optimus, and we are not sad even if we don't have it
🙂now the most important thing you should do is to make sure the unit you have received is good before the return period expired:
1. check temperature (CPU, GPU); to me just play heavy games for long hours will do. then check the temperatures of these main components;
2. check if the display panel had dead pixels;
3. check if the keyboard backlight, and fn keys are working;
4. check all ports (usb, headphone jack, hdmi, minidisplay, etc.);
5. check your LAN, bluetooth and WIFI connections;
6. check everything else that are common to your daily usage.
this way you can avoid potential issues later on (we buy the machine to enjoy it, not sending it away for repairs or RMA; so make sure you do your part to save yourself from all the troubles)