Old G4 PowerMac acting strange - does it have PC RAM?

PowerMacs are easy to open up, so taking out the RAM is easy. But how do I check that the memory inside the PowerMac is MacRAM and not PCRAM (or something else)?
Is the fact that the Mac starts up proof enough that the RAM inside is MacRAM?
Of course good MacRAM could get faulty, how do I check that?

Fitting RAM to a PowerMac looks really easy with that nice box and all, but it proved rather time consuming.
Any 8-year old child can fit RAM to a PC once he has seen it done, but with the PowerMac fitting RAM is more like a mystic experience (unless you buy Apple memory and can complain).
I tried Rember but it was a total waste of time, it doesn't test all memory and it doesn't even tell where the problem is if it finds one. Testing memory for faults on a Mac isn't possible. But PC's are everywhere and it's easy to test memory on a PC with a LiveCD.
So I took out the memory from the 2 Powermacs and some PCs and started testing, all RAM seemed good, and I put stickers on them all, if they hadn't, with size and speed (PC66, PC100 and PC133).
Then I started fitting combinations into the PowerMacs, by luck I had a brand new Tiger installation on a LaCie firewire disk on the PowerMac from which I tried to boot from and another disk inside. One RAM combination corrupted the firewire disk, and some combinations wouldn't boot the firewire disk at all, I also noticed that the startup sound was very different depending on what RAM combination was fitted, and some combinations wouldn't allow shutting down the PowerMac.
I ended up with 3 high profile and HP branded 256Mb RAM sticks on the 466MHz DigitalAudio, but that combination was totally rejected by the 800MHz Quicksilver. For the Quicksilver I ended up with 2 RAM sticks made for iMac (not by Apple) and one lookalike (128 and 256 Mb for the ones made for Apple, and 512Mb for the last one). I had tried those in the DigitalAudio but it hadn't appreciated at all. They've both been running for some time without any problems.
Here's the howto, try different RAM combinations and for each follow these steps, if the impression is negative don't go further but try another combination:
- harmonious startup sound, it should come quickly, be reasonably loud and have a good harmony
- nice boot, it should be quick and nice
- nice shutdown, also quick and nice
- if you've got an old LaCie firewire disk, try booting from it, it should be found at startup
- boot off the Apple Hardware Test disc and test the computer at least 10 times (why Apple hasn't found a way to loop this test is difficult to understand)
You've probably understood why it's time consuming, but when you're finished you can happily relax that now you're a PowerMac RAM Guru, because that's what it takes to be able to fit memory into a PowerMac.
Well I ended up with some leftovers that I put into the first generation Powermac G3, it starts up nicely but I can't get anything on the monitor, just once a grey screen, maybe it's the memory, maybe not, well I'm not yet a PowerMac G3 RAM Guru! I'll startup a new discussion for that one.

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