Option 1: Buy / Aquire new PC's.

Option 2: Play 3/4 on your best comp and 2/1 on your slowest.

Option 3: Don't play 5 accounts, go triple or dual if thats all your comp can handle.

Option 4: Don't multibox, save your cash till you can afford new comps or upgrades then multibox.

Option 5: Something else that I haven't thought off or something vital you left out to warrant an option 5.

Regards,