If you are starting over from scratch, you are talking about wiping everything out, Drivers included. This is why re-imaging (re-installing windows) is such a pain to do. I am normally a little reckless in my installs because as long as the hardware is fine, it will boot.
You can lose your LAN and Wireless LAN drivers, you will probably lose you video drivers, windows might have them pre-included, but don't count on it, and you WILL lose SLI until you re-install the nvidia drivers, but that is not too hard to do, just download and re-install. But, if you lose your LAN and WLAN, you cannot re-download them on your system. You wind up downloading from another computer (or using install disk) and transferring at least the wireless card or Network interface card (NIC) driver using a flash drive, and then downloading everything else from your system.
I would remove one of those drives before you install windows, then replace it afterward, I have had windows on a number of occasions install the boot partition on the second NON OS drive, then when that drive failed, i could not boot until I re-created it on the primary drive, you can avoid this in setup if you know how, but just pulling it out, installing, and replacing it after is easier in my opinion.
You should not have problems with RAM recognition, (unless you are installing windows 7 32bit) that is normally handled by the BIOS/UEFI, and you won't be changing that.
Also, make sure you can re-install any Licensed software (non-free) you may need to check the manufacturer to be sure.
Another thing to consider, is what kind of Window s7 do you own, OEM or Retail. Retail is "Slightly" more expensive, but you get a transferable license (you can move it to as many computers as you like, but you can only have it on one at a time) OEM is cheaper, but it will be bound to your Hardware, I believe to your BIOS/UEFI. You cannot transfer it, it will fail to activate on the new hardware, and Microsoft will not help with it (much) because it is an OEM copy (you also agree to provide your own support when you buy OEM copies) IF you bought you copy of window in a store, it is retail(who does this anymore ), if you did online, check to be sure, if you have already installed it on something else.
Lastly, once you have re-installed and updated, create a restore point, and a recovery image/disk could not hurt!
Don't be afraid of this, it takes time, and is kinda tedious, but I have done it hundreds of times, you will probably have few problems, and none you cannot fix.
Edited by jax7778, 13 September 2016 - 04:07 PM.