Slower Machines OK
I ran my SX3 using Mach3 on a 600MHz HP (found on hard rubbish collection) with 384MB ram by reducing the maximum feed rates to 1500mm/min (60 IPM) using XP Pro SP2 with no problems.
You can make it go faster if you use Win2000.
I now use a 1.4GHz junk box, with 512MB Ram on Win2000 at 45KHZ with no limitations.
XP uses too many resources too often. That's why you need a fast box.
With Win2000 my machine is networked, still running AVG anti virus with no noticeable effect on machine performance.
Don't hit a golf ball with a cricket bat.
Super X3. 3600rpm. Sheridan 6"x24" Lathe + more. Three ways to fix things: The right way, the other way, and maybe your way, which is possibly a faster wrong way.