I started the evening off by installing the new 1.5GB of ram I just got from OWC into my dual 553MHz Digital Audio G4 (previously using 2 256 Mb dimms). The only quibble is that the Apple System Profiler reports it as 100MHz 322 ram. It's supposed to be 133Mhz 222 ram. I've read in various searches that Apple's profiler often reports incorrectly when the ram is backwards compatible type. Someone suggested checking it in System 9's profiler and sure enough, it says PC133 CL2 there. Leopard also says PC100 322, BTW. After doing some testing and benchmarking to compare the new ram behavior (XBench is reporting about 10% faster memory tests after the upgrade), I then proceeded to install the Newer Technology 1.8GHz 7448 processor upgrade (thought about doing 2.0 GHz but ultimately concluded the 0.2 GHz improvement probably wasn't worth an extra $75 and used that towards more ram instead. In my previous thread, I reported that I recently installed a Sonnet SATA card and replaced my two 40GB pata drives with two 500GB Sata drives which are about 4x faster (75MB/sec compared to 25MB/sec). I'm still waiting for my ATI 9700 Pro to arrive back (first one went bad within a week so I sent it back for a replacement). I've also already changed the stock CD-R drive to a 16x Pioneer DVD-RW drive and put in a USB 2.0 PCI card and changed the Zip drive to a front panel USB 2.0 and Firewire Hub. Following the instructions for updating the firmware, I removed the multi-processing plugin from my OS9 partition and then ran their firmware CD. It ran without a hitch. Next, I opened the case and according to the instructions, I should remove the clips from the heat sink and in my case the plastic 'shield' thing that's over top of it. This is where I had some issues. The instructions didn't show any picture of that plastic shield (apparently only found on SOME Digital Audio G4s) and pulling on the only clips I could see was not getting me ANYWHERE (it seemed to be locked onto the back of the case somehow, but I couldn't see anything on the inside of the case to release it and the tab on the back did nothing. I looked all over the place and for any info I could find on the Net and NOTHING helped. Then, I noticed two screws on the back that I thought MIGHT just be attached to it somehow, even though the manual implied it was just a cover for the heat sink. Well, sure enough, it was attached alright. After removing the two screws from the rear panel of the case, the plastic shield came right off. After that, it was just a matter of prying off the clips to the heat sink, unscrewing the three screws holding the dual CPU board in and pulling it straight up and out. The new 7448 board is already attached to to its own heat sink and one of the fans is mounted on top. The other one is dangling off the power cord to the other one so you can run the old screws through the heat sink holes and down into the motherboard to secure it. This is BAD NEWS if you try to use the little screwdriver they include because it's not a tight enough fit on the head to hold it in place long enough to slowly lower it down those holes. My own magnetic screwdriver kit wouldn't fit (too wide a shaft to make it down that hole). Fortunately, I had a little cube magnetic device down in my garage that lets me easily magnetize and/or demagnetize any screwdriver quite easily. I used that to magnetize the screwdriver they included at which point it would hold the screw on the end so I could easily lower them into place and fasten them. From there, you simply put the dangling fan into place and secure it to the heat sink with the included 4 screws. The two fans then plug into a free Molex connector and provides a pass-through. I closed up the case and powered up. Tiger booted right up and my Xbench 1.3 rating went from 37 to around 76. I'm sure it would be higher yet if my ATI 9700 Pro were installed. CPU scores ranged from 3x to almost 4x faster. Things seem noticeably faster. I just finished ripping my entire 300+ CD collection into iTunes yesterday using Apple Lossless and the whole iTunes interface is considerably faster to scroll with album art turned on, although CoverFlow is still pretty miserable without real 3D acceleration support (should massively improve once I get the 9700 Pro back). I then tried booting into Leopard (I have OS 9 on one partition, Tiger on another and Leopard on a 3rd partition). I'm typing in Leopard right now. Overall, Tiger is STILL massively disappointing for performance compared to Tiger. Some back end things are faster in XBench, but the graphics tests are considerably slower than Tiger (75 in Tiger versus 35 in Leopard for Quartz and 143 fps OpenGL in Tiger compard to 29 fps in Leopard). User Interface tests were ABYSMAL in Leopard (93.8 in Tiger versus 10.4 in Leopard!!!!). That is INSANELY BAD in Leopard (1/9 the speed of the User Interface and I believe it. Tiger is the definition of "snappy" now while Leopard is almost like MUSH by comparison. Now I realize the graphics card in there right now is a mere Rage 128 and things should greatly improve when the 9700 Pro comes back since it has both Core Animation and Quartz Extreme support and the Rage 128 has neither, but still.... there's no excuse for such a drop in performance in Leopard, IMO. I've got every other aspect of this PowerMac upgraded (Sata scores that are as good as some Mac Pros, CPU scores comparable to G5 PPCs and a full 1.5GB of ram (133 CL2; the fastest available for the G4 DA). I'd think maybe something was wrong with the hardware (I've seen reports of other upgraded G4 Digital Audios running 'faster' under Leopard and old Powerbook's that are quite a bit slower than this upgraded one with 3x higher User Interface scores in Leopard), so I have to ask WHAT GIVES? If I can ever get the 9700 Pro back, I'll do another comparison (it SHOULD then show the 'faster' results in Leopard, but somehow I doubt it....) On the other hand, Tiger is now much more pleasant to use and ITunes serving up music (the system will be used to drive a whole house audio system with Airport Express and/or AppleTV units) uses less than 9% of the CPU.