No need for drivers to find out what it might be. Download and run TattleTech, the PDS/NuBus report should give you the information about the class of the card and maybe the Rev.Level of the firmware right from from ROM on board. Don't know that I've ever checked out an Accelerator with TattleTech, but it's a good bet.
PPC is a possibility, but I've never even seen a heat sink on a DSP, much less active cooling. Proc card upgrades for the 486 didn't entail overclocking the crap out of a standard part. Powering the fan from the PDS power budget makes sense to me, those wires look fairly hefty. Running a 25% overclocked 68040 (RTFM skipping bozo field installation) without the fan hooked up = imminent catastrophic failure.
Running the 40MHz part at 50MHz would be a 25% speed bump for the 840AV and a 51.5% bump for the stock Q650's 33MHz clock and 100% for the Centris version, IIRC. Overall system performance ought to be very noticeable even though system performance/clock bump is never proportional, even on an 840AV.
Just sayin' :
PPC is a possibility, but I've never even seen a heat sink on a DSP, much less active cooling. Proc card upgrades for the 486 didn't entail overclocking the crap out of a standard part. Powering the fan from the PDS power budget makes sense to me, those wires look fairly hefty. Running a 25% overclocked 68040 (RTFM skipping bozo field installation) without the fan hooked up = imminent catastrophic failure.
Running the 40MHz part at 50MHz would be a 25% speed bump for the 840AV and a 51.5% bump for the stock Q650's 33MHz clock and 100% for the Centris version, IIRC. Overall system performance ought to be very noticeable even though system performance/clock bump is never proportional, even on an 840AV.
Just sayin' :