To elaborate a bit on what Beachycove wrote:
Apple sold two machines called the 8600. There was the original 8600 and the 8600 Enhanced. The latter supported the 604ev cards and has the "Kansas" motherboard.
If you're not sure which you have there are two definitive ways to tell. The easiest is to go to Apple System Profiler and check your ROM Revision under Production Information. If the ROM Revision is $77D.34F5 then you have the Kansas logic board. If it is $77D.34F1 (or is that F2?) then you have the earlier unenhanced 8600.
On the logic board itself, if one locates the ROM chips (I believe they're on the bottom of the board on the 8600), which are four chips approximately 1.1" long and .5" wide, look at the Apple part numbers on the chips. If they are 341S0280 through 341S0283 then the logic board is the original 8600. If they are 341S0380 through 341S0383 then the logic board is the 8600 Enhanced Kansas logic board. The '341' bit may be wrong. I'm working from memory here.
On the 9600 the ROMs are on the top of the board, otherwise all of the above information applies for distinguishing the original 9600 from the 9600 Enhanced.
Also, on the 9600 Enhanced, the four square cache chips will be missing towards teh front of the machine from teh PCI slots on the logic board. The pads are there for the chips, but they are not installed because the 604ev cards have the cache on board.
If you look in Apple System Profiler and see $77D.28F2, then your machine has an 8500 or 9500 board installed (unlikely for the original poster, but including for completeness). The ROMs from the 8500/9500 are marked 341S0168 through 341S0171. The 7500 and 7600 also have these ROMs. The 7300 has the $77D.34F1/341S0280 - 341S0283 ROMs.
Apple sold two machines called the 8600. There was the original 8600 and the 8600 Enhanced. The latter supported the 604ev cards and has the "Kansas" motherboard.
If you're not sure which you have there are two definitive ways to tell. The easiest is to go to Apple System Profiler and check your ROM Revision under Production Information. If the ROM Revision is $77D.34F5 then you have the Kansas logic board. If it is $77D.34F1 (or is that F2?) then you have the earlier unenhanced 8600.
On the logic board itself, if one locates the ROM chips (I believe they're on the bottom of the board on the 8600), which are four chips approximately 1.1" long and .5" wide, look at the Apple part numbers on the chips. If they are 341S0280 through 341S0283 then the logic board is the original 8600. If they are 341S0380 through 341S0383 then the logic board is the 8600 Enhanced Kansas logic board. The '341' bit may be wrong. I'm working from memory here.
On the 9600 the ROMs are on the top of the board, otherwise all of the above information applies for distinguishing the original 9600 from the 9600 Enhanced.
Also, on the 9600 Enhanced, the four square cache chips will be missing towards teh front of the machine from teh PCI slots on the logic board. The pads are there for the chips, but they are not installed because the 604ev cards have the cache on board.
If you look in Apple System Profiler and see $77D.28F2, then your machine has an 8500 or 9500 board installed (unlikely for the original poster, but including for completeness). The ROMs from the 8500/9500 are marked 341S0168 through 341S0171. The 7500 and 7600 also have these ROMs. The 7300 has the $77D.34F1/341S0280 - 341S0283 ROMs.