I have seen various discussions around here and elsewhere about whether or not ECC RAM will work in the various G4 towers requiring SD-RAM. Most say that it won't work, with some saying that it does. Not too long ago, I found myself short of 512mb sticks, and went to my favorite virtual boneyard-Ebay-to stock up on them. I ordered 5 sticks of PC-133 from Hong Kong. This was advertised just as standard PC-133 low density RAM. Nowhere in the description nor on the sticks themselves does it claim to be ECC. None the less, I put one stick of it in my Quicksilver, and this particular stick is identified in system profiler as ECC. I've had it running for about a week, and have had zero issues. That included some heavy Photoshop use and other tasks which should have taxed the system resources. As I said, the RAM stick I installed is not marked as to being ECC. It is a Transcend brand stick, and carries the part number 266885-0079. Here's the system profiler screen shot.