Hard to say, as machine performance is more than just the amount of RAM in the machine. Given Windows 10 will be a free upgrade to Windows 7 and Windows 8.1 users, and there are at least a decent number of x86 installs of those out there, it's possible that there will be x86 editions of Windows 10. That would mean it would be designed to run at least the 32bit platform within the 4GB RAM limitations. There's a 32bit preview edition along with the 64bit version, and while obviously I can't say for certain that will survive to RTM, it's likely that it will.
Computer Type PC/Desktop System Manufacturer/Model Number Custom OS Windows 8.1 x64 CPU Intel Core i7 4790K @ 4.5GHz Motherboard Asus Maximus Hero VII Memory 32GB DDR3 Graphics Card Nvidia GeForce GTX970 Sound Card Realtek HD Audio
PSU Corsair AX760i Case Fractal Design Define R4 Cooling Noctua NH-D15 Hard Drives 1x Samsung 250GB SSD
4x WD RE 2TB (RAIDZ)
I am afraid too. Should I install it or not? I've tried it in a virtual machine. Don't want to make a dual boot thing. Wondering if I should just install it on my system. As long as it doesn't crash my system, I don't mind doing it. I am computer smart, but not as computer smart as some of you are on here that helps people.