1 gb of ram dual cpu G5. It boots and runs Tiger flawlessly. There are some issues however. DVD drive works well with DVDs but the laser is too weak to read some rdls. I couldn’t get leopard on there but it could be the rdls I had on hand. The tray pulls in and out just fine.No storage with it but from what I’ve tested, it only seems to work with small laptop hard drives. Large ones don’t seem to even start spinning.CPU B, from what I believe from testing, has a bad thermal diode that exaggerates thermal readings when it gets past 50-60 degrees C. It reads it as 90 C and causes a kernel crashes. I know this for sure because I put it through an intense cpu bound task (compiling C) and it jumped up from 60 C to 90 C in mere moments (breaking laws of thermal dynamics)This IS my first item on here so I would understand being paranoid so just message me and I’d be down if you would like to get on a call.