VRAM DIMM

Question

I have a Power Macintosh 7200/90 that I got on EBay I am upgrading the Ram on it, I opened up the case last night to see what was inside if there were any empty slots. There are 4 stick 2 look like normal ram but the other 2 I discovered this morning as I was looking on eBay look like VRAM DIMM, they are very thick and look like a picture that I found on eBay of VRAM DIMM. Is it possible for these to be in the DRam slots instead of the VRam slots would the computer still work? Also is it possible for me to use memory from a Ruby IMac G3 DV? I have two 68 mb sticks that I took out of my IMac that I hate to waste.
Apple iMac DV G3/400 Ruby Red & Power PC Macintosh 7200/90   Mac OS X (10.0.x)   400 MHz PowerPC 750, 128 MB ram, 20 GB Hard Drive, Slot Loading CDROM

Answer 1

I see.
Some older DIMMs are "fatter" than we see today. I can't say for sure if that makes them VRAM. The computer may run with VRAM in the RAM slots (assuming they have the same pin layout) but they would certainly not be recognized. It is more likely that the computer would not boot, giving the "breaking glass" sound instead of the normal startup chime.
When you get the computer open tonight, shine a light into the RAM and VRAM slots (reference the logic board diagram. Slots have bars every so often that "key" them for the right RAM. The RAM sticks have corresponding notches to clear the bars for full insertion. I doubt that RAM and VRAM for the same computer would have the same pattern of bars.
The RAM from the iMac will work in Beige G3s, Blue & White G3s, and early G4s--any Mac with a system bus speed of 100mHz or less, except the early eMacs. Even though they had a 100mHz bus, they have to have 133 speed RAM for some reason.. That iMac RAM is called "DRAM" and is a more evolved type than that used in older Macs.