Maybe you'd want to go as high as 64MB on the RAM, but beyond that is usually pointless with socket 5/7 chipsets as their cachable area is only 64MB, so things get slower above that. However on a 430TX machine trying to run 2000s stuff on K6-2 win98, like 2003/4 era browsers etc, I took that system up to 128MB and found it was better than the HDD thrashing all the time trying to swap. But that's not what you'd typically find on games that a P75 is fast enough to play, they probably had 16MB requirements, maybe 32MB if you had a 3D card.
Turbo buttons never seemed to me to have a well defined standard behavior, some would clock CPU to exact 4.77 of original PC/XT (More common in Turbo XTs) some would clock to the 6 or 8mhz of original AT models (Seen in 286-early 486 AT class) and some would just run the CPU synchronous with whatever your ISA bus speed was set to, anywhere from 7 to 12Mhz late 386 thru 486 and up. I have not come across one in a Pentium class machine myself, but I would guess that it either runs it at 1:1 "FSB" speed, PCI speed, or ISA speed.
Unicorn herding operations are proceeding, but all the totes of hens teeth and barrels of rocking horse poop give them plenty of hiding spots.