Formac ProQuadra 50 MHz 68040 Upgrade?
- Thread starter Nathan_A
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jeremywork
Well-known member
It’s essentially the same thing as the cached version of the Sonnet QuadDoubler or NewerTech Quadra Overdrive, but on a PDS card instead of directly in the 68040 socket.
I really thought I'd seen 'em all at this point. Your description makes sense. So the Quadra 900 here would normally be running its bus and CPU at 25 MHz, and this thing clock doubles the bus and runs the CPU at 50 MHz. Makes sense. It's like a 68040 DX2 
Kind of neat that you can defeat the clock doubling in software to run it at the lower 25 MHz speed. Though I have no idea why you'd do that since it's then just the same as the stock CPU. Perhaps for the cache?
Kind of neat that you can defeat the clock doubling in software to run it at the lower 25 MHz speed. Though I have no idea why you'd do that since it's then just the same as the stock CPU. Perhaps for the cache?
jeremywork
Well-known member
It is pretty cool to be able to choose (especially for benchmarking purposes.)I really thought I'd seen 'em all at this point. Your description makes sense. So the Quadra 900 here would normally be running its bus and CPU at 25 MHz, and this thing clock doubles the bus and runs the CPU at 50 MHz. Makes sense. It's like a 68040 DX2
Kind of neat that you can defeat the clock doubling in software to run it at the lower 25 MHz speed. Though I have no idea why you'd do that since it's then just the same as the stock CPU. Perhaps for the cache?
Technically the other two reduce to 25MHz any time the CPU needs to communicate directly with the bus, but I don't think they can be manually disabled.
Oops, thanks.
ArmorAlley
Well-known member
Did Motorola ever make 50Mhz 68040s or is it an overclocked 40Mhz 68040?
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