You can use up to eight controllers at once, four PS3 controllers and four Xbox 360 controllers (Yes they will still work!). Any combination of the two will work.
For software and drivers, select your product from the list below. Xbox 360 Controller for Windows. Manuals Product Guide. Product Guide. Product Guide. Product Guide. Product Guide. Product Guide. Windows 7 (64-bit only) Xbox 360 Accessories Software 1.2. Windows Vista (32-bit only).
Example: Four PS3 controllers as controllers #1, #2, #5, and #8, four Xbox 360 Controllers as controllers #3, #4, #6, and #7. The order the controllers are connected will determine which controller is which (just as with their respective consoles)
When used as controller #5, #6, #7, or #8:
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Xbox 360 controllers will not light up at all
PS3 controllers will all light up their fourth light
Battery levels will not ever display for the PS3 controllers. I believe this is because PS3 controllers send their battery level information in a different way than Xbox 360 controllers and the Xbox 360 Accessories program does not recognize it.
The PS and Xbox buttons on each controller will not open the controller info pane (it is only designed to display four controllers)
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You can tell if the Xbox 360 controllers that are player #5 or higher are connected by pressing the Xbox button. If the ring of green lights stays completely off and does not blink at all, it is connected (or the batteries are dead, but let's hope you put in some fresh ones first)