well a SIMM is a Single Inline Memory Module, DIMM is Dual Inline Memory Module (youll want to settle with DIMM) and RIMM is Rambus Inline Memory Module, i think....
about your power supply, youll know if its ATX12V if it has that 20 "square" plug-in. also if i were you, i wold upgrade to atleast a 350w power supply, itll help.
now, does your sidewinder controller use a serial plug? usb? lol, and no you cant yank the plug off of your mobo or youll destoy it. all mobos should have serial and usb. i its an older one, it might have serial only, which works fine. if your controller is using a serial plug, all mobos should have it (unless its a complete piece of crap). serial is the kinda bulky 9 pin plug.... usb is the slim rectangular plug (it dosent use pins).
i hope what i have said has helped you.