After playing around with Mac OS 9 on the Mac Mini G4, I wanted something better since the setup is a bit janky with audio not fully working and certain games won't run. I decided to spend a few hundred dollars to build close to the "Ultimate" PowerMac G4 I can come up. This excluded third party accelerator cards since those are very rare and will cost a lot of money. Basically, I want this to be my ultimate retro Mac gaming setup and running a couple legacy apps.
It took buying two PowerMac G4s to get the perfect one and I couldn't buy locally since there is none available in Washington DC Metro. I bought a PowerMac G4 Quicksilver thinking it's an 800 MHz dual processor model. It's not and it had a failed hard drive and the fan was making loud clanking noise. So I basically returned that one for a full refund and bought an MDD for slightly more money. It worked out in the end as this is the 2003 model with a single 1.25 GHz G4, 1.5 GB of RAM (which I upped to 2 GB), and a ATI Radeon 9000 Pro 64 MB, which is the fastest that can boot into Mac OS 9. Surprisingly, the fans aren't that loud, especially after taking out the hard drive completely and replacing it with 2 SATA SSDs. Still, the machine is in really good shape, except a few cosmetic issues.
I found a rare PCI SATA card from an online store that allowed me to use two SSDs without having to use IDE to SATA adapters. Also, bought a PC version of the ATI Radeon 9000 Pro with 128 MB, which was easy to flash for the Mac since the ROM chip was big enough to fit the Mac ROM. I want to eventually find a official Mac version of the NVidia Geforce 4 Ti 4600, which is an option for this Mac and is the fastest card that works under Mac OS 9. Sadly, I haven't had any luck finding that yet. But the system is very snappy, especially after upgrading it to Dual 1 GHz G4s, which I added new Noctua Thermal Paste on (which I highly recommend since I use this on my server build). It runs fine after a few hours of use and haven't turned off.
Even with a Dual 1 GHz G4, browsing the internet is slow on this computer. Of course, this is not my intended use of this machine since I have other Macs and other devices that can do that. Still, I kind of wished Macs were this upgradable like in the past. But still, I am excited for what Apple M1 and Apple Silicon has to offer. I never find any of the Intel machines that unique compared to PowerPC and even the new Apple Silicon Macs. I have a collection of old Intel Mac, mostly MacBook Pros, but basically they are my former machines before I retired them.