Maximizing the G4 Mac Mini

Apple's Mac Mini is a fine little computer, but who can even leave that little beauty true to the Apple design. I've owned my G4-powered Mini since March of 2005, so it's about time to have some fun with upgrades.

Lots of info is available on how to open the unit, as well as other internal upgrades. This is a page that is based on my personal experience with modding out my Mini. I've provided links along the way to give credit to those that made this endeavour possible, even simple. Keep in mind, all this is done at your risk. Let common sense prevail. This is a Mac Mini upgrade guide, not a bible. If you have a knack for tinkering, this is for you. This is guide shows how I upgraded a 1.42GHz Mini to maximum RAM, a fast hard drive, and overclocked the processor to 1.58GHz.

Opening the Unit

Many folks were there before me, so some quick searching found what I was looking for. The most popular method seems to be using two thin putty knives to open the mini. You'll find a MacWorld aricle on that here.

Myself, I was using what I had around the house. What did I have? A big-ass kitchen knife, that's what. Same principle as the putty knife technique, but makes for far cooler pictures. Strangely, your loved ones also stay away from you during this process. Wedge the knife in there and pry the base open. You have to work your way around the front and the two sides to release all the little plastic "fingers" which are keeping the two pieces together. I've taken my Mini apart several times. I think the first time is the hardest, not only because of lack of practice, but the fingers are holding like mad. Once you work them a couple times, the process becomes much easier.

Before you get too far, consider ESD precautions. Electro-static discharge can turn a simple upgrade into a very expensive repair. I did the work on my desk, after I touched an electical appliance that I knew was grounded. If you can use a static safe work surface and a wrist strap, even better. Remember, you're poking around at your own risk!

First Visit Inside...

I'll spare you the tour, as I hope if you're doing this kind of tinkering, you're a bit familiar with the components of a computer. The Mac Mini is esentially a laptop without a display, so it uses many laptop components that you'll find in iBooks and PowerBooks.

In the G4-powered Minis, a full size stick of RAM is utilized. I originally had a 512 in there, but I've found that OS X was using up almost the entire 512MB during regular use. Combined with the oh-so-slow 4200RPM hard drive, the computer wasn't exactly a rocket ship. So, my first trip inside the Mini turned into RAM upgrade. Programs didn't load any faster after the upgade, since that's a hard disk function, but the overall usability went up. Once loaded, programs like iPhoto and Photoshop functioned noticably better. The cheapest and best initial upgrade for your Mini is to invest in maxing out the RAM to 1GB. For around $100, your computer will be noticably more perky. As I'm writing this article, my Mini is using up almost all of the 1GB. That being the case, you can appreciate how much hard disk access is necessary to keep up with your demands when only 256/512MB is installed. After a fresh boot, the computer has about 500MB free, which is already at the limit of what a 512MB stick can deliver.

Wanting More...

Selling off a bunch of old stuff an eBay has the benefit of generating an income that can be readily spent on other toys. The Mini, with it's recent memory upgrade was asking for a new hard drive. The original 4200RPM was too slow to play back DV video. When I was using Final Cut Express, DV-video would keep stalling out during playback, necessitating the use of an external FireWire 7200RPM drive.So, Hitachi and Seagate to the rescue. Currently, 7200RPM laptop drives are available from both manufacturers. I purchased a Seagate Momentus 100GB, 7200RPM for $199 in the San Francisco Bay area. If you plan on upgrading your own drive or overclocking the Mini, you'll need a small phillips to work with. Having a few small phillips screwdrivers handy will allow you to find one with the best possible fit. There's one screw for the hard drive that requires the phillips to have a thin shaft (size of the phillips head itself) for about two inches. Hard to explain, but you'l find this out when you get there.

Getting to the hard drive requires the following... First, remove the Bluetooth and WiFi (Airport) antennae, if your Mini has those options installed. They simply pop off, so no tools are required for this task. The optical drive, hard drive, and CPU fan all reside in a plastic cage that attaches to the motherboard with three screws. The back corners and the front right (where the power light is) have these screws. They reside in the bottom of a tubular "well" that actually helps in not losing the screw once it's unscrewed. Take all three out and you're ready for the next step. Now, carefully lift up the whole cage assembly. A small PCB resides at the back, which plugs into the motherboard. This should come out fairly easily. You need to be careful of three things when this assembly is being removed, all cable related. The power switch cable can get snagged in the back right corner. The power indicator light cable can get snagged in the front right corner. Finally, you need to watch that you don't pull too hard on the Bluetooth and WiFi antenna cables. These will have to be gently taken out by hand. Take your time and it will all be good.Now, you can remove the optical drive if you want to gain better access to the drive. There are two screws in the back of the drive, going through the green PCB. Also, there are two on each side, underneath the wide top portion of the drive. Slide the optical away from the PCB, to release its connection to the board. Once this is done, you have a clear shot to the hard disk. Take out the old one and replace it with your choice of the latest and greatest 2.5" hard drive. In my case, it was a Seagate 100GB, 7200RPM. Once you get your Mini back together, you'll need to run the Hardware Test CD, which contains the Disk Utility. This ulility will allow you to format your shiny new drive to a file system that OS X likes. Once this is done, you can re-install OS X from your CD, or use the restore disks that came with your Mini.

For additional information, here's a nice article at notebookreview.com comparing the Seagate and Hitachi 7200RPM drives. This should make your buying decision easier. The installation of a 7200RPM drive helped a lot in performance as well. iPhoto opens much faster now, since the drive can deliver data at much greater rates. DV-video now plays flawlessly in Final Cut Express. The Mini finally has components that rival a full-size desktop machine...

The Finishing Touch...

So, the Mini now has 1GB or RAM and a 7200RPM hard drive. The only thing left is to overclock the CPU. My Mini was equipped with a 1.42GHz G4, which I read in an overclocking aricle can be safely OCd to 1.58GHz. I then gathered initial information on the location and layout of the speed-setting resistors. Armed with this basic information, I was able to remove one resistor and gain close to a 12% increase in CPU speed. Based on scattered info, I've learned that the 1.25 and 1.42GHz Minis have different size CPU heatsinks. I read that when a person who owned one of each mini swapped the heatsink, he was able to get his 1.25 running at 1.58GHz reliably. So, depending on which Mini you own, take it easy on the overclock. It seems that the 1.25 will do 1.42GHz reliably. The 1.42s seem to do 1.58GHz reliably.

If you choose to overclock your Mini above 1.5GHz, the System Profiler will not read your CPU speed correctly. There is a fix for this. It will require a little bit of typing in terminal.

I used to have a bunch of links for the overclocking info I found, but all those articles are long gone, banished to an internet of yesteryear. I still have copies of those articles, so if you have this older generation Mac Mini and want to tinker a bit more, I'll be happy to email you what I have. The email link is at the top of this page.

All this stuff can be a bit more advanced than your basic part swap, so be careful when you mess around with your Mini. Good luck!

Last updated September 23, 2007