just got a performa 5200CD

[Bunsen]

performa 5200CD to a performa 6400

- will there be physically enough room to fit a g3 L2 Cache upgrade card?

Maybe, if you can find one.  This Color Classic mod uses one, and if anything there's less room in a CC.

- will there be physically enough room to use ANY PCI riser card? the standard 2 slot one? or perhaps finding a 1 slot one if the 2 slot one doesnt fit ?

Chances are good you could get the 1-slot riser to fit, as they've been used in CC upgrades a bunch.

From the PCC pages, here's a single riser in the back of a CC:



The 2-slot riser might require a little more surgery.



There's a slightly less hacked up second version by the same modder here.



Either one will require a new or hacked up back panel (ie, one that matches the new motherboard's port layout), or just leaving the back panel off.

NB: the PCI riser is the only difference between a 54/5500 and a 64/6500 at the motherboard level - the boards themselves are identical, and the risers are interchangeable.  So you could if you wanted start out with a 1-slot and upgrade to a 2-slot later.

 

[supernova777]

is there any way to use a riser card to install more than one PDS card in the Performa 5200CD motherboard?