Thanks folks, I did some research on how much this thing can handle (doubled) and maxed it out. The new cards came in anti-static bags and I grounded myself by touching the door knob, no history of static, but it's that time of year.
Runs fine and fast where I expected it to.
Another question now that the side is off, what is that card (printed circuit board) plugged into the rear metal box and side white slot?
It seems I have the capability to add something, but know very little about these things.
Any help is appreciated.

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83 SD

84 CD

The White slots are PCI, the Black are PCIe.
PCI slots are pretty general, you'd have to look at your documentation to see the specs for the PCIe to determine what can be added. They can be x1, x10 ...
Different devices require different x?.

Can't tell what the card that is in there is for, what connector is on the back.
Guess would be a Modem, could be NIC but they are usually integrated.

If you don't need a Modem you can remove it. (POWER OFF).
Probably should remove any drivers FIRST too, although not a critical step.

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KLK, MCSE

1990 500SL

I was always taught to respect my elders.
I don't have to respect too many people anymore.