Simms are interesting...
To start, there are 3 different types of ram as far as simms are concerned:
sdram, fastram, and edo ram.
Please note the different speeds as well. Mixing 70 ns, 60 ns, and, or 10 ns. (nano seconds) will be your undoing before you even get started. Best case scenario here is the possibility of it running at the speed of your slowest rated simm, but don't count on it.
I have never known it to cause harm to any computer by mixing different types. Let me clarify! Most computers will not run at all... No harm, but no successful boot up either.
Ram is also paired up. You will definetly want to put the same type ram in the first two slots, 0, and 1, as well as the set you would like to try in the following two slots, 3, and 4. If your computer beeps at you funny on boot up and refuses to boot beyond your eprom/dos settings, most likely the ram isn't compatible.
Believe it or not, I have had ram problems using the same type ram made by two different manufacturers. Pain in the @$$. You can try rotating the first set with the second, but usually to no avail.
A quick test to make sure the ones you picked up work is to just replace the ones currently in your system. If your computer doesn't boot up properly with just those, then I wouldn't even take it any further.
Hope this helps a little.
PS: I build computers on the side as a hobby. LOL!
[This message has been edited by b_b_a_d (edited 04-28-2000).]