Quadras and 601 machines are really nice under 7.6.1. If you have a Mac that is 32 bit clean, then 7.6.1 is probably the way to go.
The RAM for the PCI Powermacs is super cheap, so there's really no reason to go with a software solution to solve lack of memory issues or to wear out your hard drive prematurely by forcing to thrash under the demands of virtual memory.
http://eshop.macsales.com/shop/memory/Legacy-Mac-DIMMs-SIMMs/
The ones on top are the ones you want. 64mb for 8.99 and 128mb for 17.95. At those prices you should easily be able to afford enough real RAM to run any OS your machine is capable of at a good speed. Be sure to get non-EDO for a 7200. If you have a spare 7500/7600 motherboard laying around, I'd swap that in and just ditch the 7200 board as they are worthless. A 7300 board would work, but from what I have been reading you also need the 7300 power supply.
(And the 603 wasn't a bad chip by itself, it was the machines that it was installed in that made it look bad. The 603 SHOULD have been a much faster chip than the 601 at the same clock speeds but all those x200 and x300 Macs with their horrible architectures wiped out any potential for performance gains.)
The RAM for the PCI Powermacs is super cheap, so there's really no reason to go with a software solution to solve lack of memory issues or to wear out your hard drive prematurely by forcing to thrash under the demands of virtual memory.
http://eshop.macsales.com/shop/memory/Legacy-Mac-DIMMs-SIMMs/
The ones on top are the ones you want. 64mb for 8.99 and 128mb for 17.95. At those prices you should easily be able to afford enough real RAM to run any OS your machine is capable of at a good speed. Be sure to get non-EDO for a 7200. If you have a spare 7500/7600 motherboard laying around, I'd swap that in and just ditch the 7200 board as they are worthless. A 7300 board would work, but from what I have been reading you also need the 7300 power supply.
(And the 603 wasn't a bad chip by itself, it was the machines that it was installed in that made it look bad. The 603 SHOULD have been a much faster chip than the 601 at the same clock speeds but all those x200 and x300 Macs with their horrible architectures wiped out any potential for performance gains.)