- Joined
- Sep 24, 2011
- Messages
- 116
- Motherboard
- Dell Optiplex 9020 MT A25
- CPU
- i7 4790
- Graphics
- HD4600
- Mac
- Classic Mac
- Mobile Phone
I have an old Power Mac G5 that I bought from the Apple Store way back when, 2004-ish. It was a store demo, so I bought it at a discount (do they do that anymore?), and used it for quite some time, but then retired it to storage, in its original box. Later I bought the Laserhive ATX Low kit as well as the BlackCH front panel cable set, and those sat in the closet for quite some time as the project seemed intimidating adn time-consuming. Well, a recent move unearthed these things, and the @trs96 OptiMac thread got me thinking that this would be a very inexpensive way to build out the G5.
So I acquired a 9020 MT Optimac with i7=4790 and upgraded it to 16gb RAM, and set out to merge the two. First thing was to follow the OptiMac 9020 Golden build guide and install the OS, just to make sure that all functions worked and were supported. Once that was done, I got out the Dremel. (I haven't documented the stripping of the chassis, that's well done elsewhere in here, sorry).
First step was to cut the back panel to fit the Laserhive part. I cut as minimal as possible with the Dremel for the curved sections and a DeWalt angle grinder with thin cutting disc for the long straight cuts. All cuts were deburred and smoothed with a fine metal file before final fitting of the back panel (not pictured).
Since the "low" kit doesn't allow room for the original G5 long case power supply, that had to be removed and can't be used to house a new supply like the mATX or High kits can. However, I planned on putting a supply in the bottom section and to install a disc drive/writer and keep the hard drive cage in the top section above the shelf. In order to preserve as much of the outside look of the case, I didn't want to drill holes in the bottom, and also wanted to use the original Apple power cord with its rectangular flush-fit mount.
So the plan was to discard the top of the power supply, gut it, and cut it down to work as a mounting sled for the Dell PS (or an ATX supply) allowing reuse of the original Apple IEC inlet plug.
I made the cuts with the angle grinder and test fit. I got lucky with my cutting and the fit was spot-on, just clearing the 120mm fan as well as the LaserHive motherboard tray. I also had to modify the LaserHive back plate by cutting a rectangular hole to fit the Apple IEC AC inlet.
The LaserHive motherboard mount makes things so much easier. Knock out some posts, apply screws, mount board, easy. I didn't stop to take pictures.
The 9020 motherboard is basically a mATX size, approx 9.5" x 9.5" so there is lots of room, and it fits comfortably below the drive shelf.
I took apart the case for the Dell power supply, drilled holes in the base of the Apple PS and then in the bottom (side, as originally mounted) of the Dell PS to match, tapped the holes and screwed the power supply in place on the mounting sled.
The bottom looks stock this way, I like it. To keep things simple and to finish the build more rapidly, I decided at this time to use the Dell power supply. It is 290W, 80+ Gold-rated, and as I'm not using a graphics card and likely only SSD drives, power shouldn't be an issue. I can always convert to an ATX supply later.
I cut an old power supply cable to fit the length from the back power inlet to the front of the case where the Dell ps IEC jack resides. Next, stripped wires, ran the ground to the chassis like the original and soldered the others together. Wires are then covered in heat shrink and also I use high temp coated fiberglass mesh tubing as a protective layer over the smaller gauge wires.
The power cable fits perfectly. Still to do I need to add mesh cover for the fan.
Plastic inner cover fits as it should. Somehow, somewhere, I lost the hard drive screws for the original Apple drive rack...
someone is selling them on eBay for $4+ each, no thanks, I'll figure out another solution. I'm going to be using two SSDs,
there are several mounting solutions that convert 3.5 to 2.5. Rounded head 6/32 screws sort of work in the meantime (not pictured).
Also, the cables are a bit messy, I'll sort that out as well, and find a place to mount that original G5 panel that was on the CPU cooler inside the case.
120mm fan, PWM 4-wire, connects to the Dell mb via a 4-pin to 5-pin adapter cable.
Dual monitors connected via the DP ports! The i7-4760 has the Intel HD4600 iGPU which works fine for general use and my purposes here.
Nevermind the missing fan screws, this was a temporary test run. I have a fan grill on the way and will mount appropriately.
I kept the front panel I/O by using the BlackCH ATX cable, and the Dell MB needs two adapters, one for the power switch and one for the I/O, from HarbinRepairs on eBay. Everything works! The only small issue I have at the moment is the power light is momentary, so it doesn't stay on when the computer is powered up, and doesn't "breathe" when sleeping. I may have it wired incorrectly, not sure, have to look closely at that, or it may be an incompatibility with the Harbin adapter > BlackCH cable, which only has a single lead that goes to the + side of the LED.
With only three fans (CPU, PS, and exhaust) it runs cool, temps are consistently in the 30s C. I have a few things to sort out, I'd like to add the original Apple fan to the upper rack for the hard drives, and also mount the original Apple internal speaker. A bit of fabrication to do to make that happen, but for now the G5 lives!
So I acquired a 9020 MT Optimac with i7=4790 and upgraded it to 16gb RAM, and set out to merge the two. First thing was to follow the OptiMac 9020 Golden build guide and install the OS, just to make sure that all functions worked and were supported. Once that was done, I got out the Dremel. (I haven't documented the stripping of the chassis, that's well done elsewhere in here, sorry).
First step was to cut the back panel to fit the Laserhive part. I cut as minimal as possible with the Dremel for the curved sections and a DeWalt angle grinder with thin cutting disc for the long straight cuts. All cuts were deburred and smoothed with a fine metal file before final fitting of the back panel (not pictured).
Since the "low" kit doesn't allow room for the original G5 long case power supply, that had to be removed and can't be used to house a new supply like the mATX or High kits can. However, I planned on putting a supply in the bottom section and to install a disc drive/writer and keep the hard drive cage in the top section above the shelf. In order to preserve as much of the outside look of the case, I didn't want to drill holes in the bottom, and also wanted to use the original Apple power cord with its rectangular flush-fit mount.
So the plan was to discard the top of the power supply, gut it, and cut it down to work as a mounting sled for the Dell PS (or an ATX supply) allowing reuse of the original Apple IEC inlet plug.
I made the cuts with the angle grinder and test fit. I got lucky with my cutting and the fit was spot-on, just clearing the 120mm fan as well as the LaserHive motherboard tray. I also had to modify the LaserHive back plate by cutting a rectangular hole to fit the Apple IEC AC inlet.
The LaserHive motherboard mount makes things so much easier. Knock out some posts, apply screws, mount board, easy. I didn't stop to take pictures.
The 9020 motherboard is basically a mATX size, approx 9.5" x 9.5" so there is lots of room, and it fits comfortably below the drive shelf.
I took apart the case for the Dell power supply, drilled holes in the base of the Apple PS and then in the bottom (side, as originally mounted) of the Dell PS to match, tapped the holes and screwed the power supply in place on the mounting sled.
The bottom looks stock this way, I like it. To keep things simple and to finish the build more rapidly, I decided at this time to use the Dell power supply. It is 290W, 80+ Gold-rated, and as I'm not using a graphics card and likely only SSD drives, power shouldn't be an issue. I can always convert to an ATX supply later.
I cut an old power supply cable to fit the length from the back power inlet to the front of the case where the Dell ps IEC jack resides. Next, stripped wires, ran the ground to the chassis like the original and soldered the others together. Wires are then covered in heat shrink and also I use high temp coated fiberglass mesh tubing as a protective layer over the smaller gauge wires.
The power cable fits perfectly. Still to do I need to add mesh cover for the fan.
Plastic inner cover fits as it should. Somehow, somewhere, I lost the hard drive screws for the original Apple drive rack...
someone is selling them on eBay for $4+ each, no thanks, I'll figure out another solution. I'm going to be using two SSDs,
there are several mounting solutions that convert 3.5 to 2.5. Rounded head 6/32 screws sort of work in the meantime (not pictured).
Also, the cables are a bit messy, I'll sort that out as well, and find a place to mount that original G5 panel that was on the CPU cooler inside the case.
120mm fan, PWM 4-wire, connects to the Dell mb via a 4-pin to 5-pin adapter cable.
Dual monitors connected via the DP ports! The i7-4760 has the Intel HD4600 iGPU which works fine for general use and my purposes here.
Nevermind the missing fan screws, this was a temporary test run. I have a fan grill on the way and will mount appropriately.
I kept the front panel I/O by using the BlackCH ATX cable, and the Dell MB needs two adapters, one for the power switch and one for the I/O, from HarbinRepairs on eBay. Everything works! The only small issue I have at the moment is the power light is momentary, so it doesn't stay on when the computer is powered up, and doesn't "breathe" when sleeping. I may have it wired incorrectly, not sure, have to look closely at that, or it may be an incompatibility with the Harbin adapter > BlackCH cable, which only has a single lead that goes to the + side of the LED.
With only three fans (CPU, PS, and exhaust) it runs cool, temps are consistently in the 30s C. I have a few things to sort out, I'd like to add the original Apple fan to the upper rack for the hard drives, and also mount the original Apple internal speaker. A bit of fabrication to do to make that happen, but for now the G5 lives!
Last edited: