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Description: A Blizzard 1230 Mk IV (68030/68882) accelerator board with added cooling! Since the 68030 is now the hottest IC in the A1200, and the 68882 had no more than 1mm of air space for cooling, I decided to do something about it given that accelerator cards are no longer made. The result is a rather large heatsink bridged between the 68882 and the 68030 held in place with little more than a liberal amount of heat paste. Due to the modified heatsink not lying perfectly parallel with the top of both the 68030 and 68882, a heat transfer medium had to be used. Adhesive heat transfer pads could of been used, but this could result in the lettering on the IC's being pulled off should the heatsink ever need to be removed. Small adjustments had to be made to the heatsink profile including a slight drop for the FPU, as the CPU and FPU (For some reason) are not at exactly the same height as one another. The area of the heatsink above the FPU also had to be ground down in order to allow it to fit above the FPU. Furthermore, one of the fins on the heatsink had to be bent up slightly in order to provide clearance for the 50Mhz oscillator on the board. Resistance measurements were also taken to check that the metal cans on the CPU/FPU were not connected together/at different potentials to make sure that one IC wouldn't accidentally kill the other (Note - Oscillator cans are usually grounded). Although the heatsink does provide extra cooling, the board can now only be inserted with the floppy drive removed (The FDD overhangs the bay slightly), the trapdoor cover can no longer be used, and the card has to be carefully edged mm by mm into the connector as the heatsink has a tendency to slide out of place. The smaller heatsink has been bolted to the main heatsink to add even more surface area, but can anyone guess what the main heatsink came from? Hodgkinson. Picture Stats: Views: 2641 Filesize: 284.77kB Height: 768 Width: 1024 Posted by: Hodgkinson at May 26, 2007, 08:49:05 PM Image Linking Codes
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| Hodgkinson Posts:1080 | May 29, 2007, 11:01:02 AM Correct! Yes, its from a dead AT/ATX PSU, and not only has it been bent and filed down to get it to fit, a large section has also been sawn off. Occasionally at radio rallies towards the end of the day people start giving stuff (Literally) away. We managed to grab a whole box full of ATX PSU's, some working, some faulty, so thats where the heatsink probably came from. Some of the faulty PSU's had really gone faulty - Great charred areas of the PCB where high power diodes have exploded in two...etc... Hodgkinson. |
| rkauer Posts:3263 | May 28, 2007, 02:41:16 PM The heatsink was taked from a dead (I hope) AT/ATX/Orig. Amiga PSU, so is the tiny one. |
| Hodgkinson Posts:1080 | May 28, 2007, 11:41:55 AM Hmmm. The best way to describe the temperature of the processor without the heatsink would be to say that you could hold your finger on the metal cap on top of the processor indefinitely, but not comfortably. As for the FPU, there’s not enough room to feel the top of the FPU. Since the A1200 is pushed right up to a monitor, I have to prop the rear of the A1200 up about 2cm to allow clearance between plugs pushed into the back of the A1200 and the monitor pedestal, and even with the clearance the processor manages to warm the bench *beneath* the A1200, with or without the heatsink. Given that I've got this thing about stuff running even marginally hot, and that I've got boxes full of heatsinks from (Anyone guessed it yet?) I thought i'll see what I can do about the issue. Now that the heatsinks installed, the whole heatsink just gets comfortably warm – And that’s not just the CPU heat output, but also the FPU heat output. BTW, the A1200 can be rested on the bench on the normal 4 feet with the heatsink installed, but the heatsink presses against the bench slightly and pushes the board up slightly. If I hadn't of adjusted the profile of all the fins – E.g. pushed them down slightly (Not just the one for the oscillator) then if the A1200 had ever slipped off of its 2cm support, the Bizzard board would be no more. Thanks for the comments, Hodgkinson. EDIT: Im in the UK, so its *usually* quite cool here, espicially in the garage where the A1200's located. Besides, the cooler stuff runs, the longer it tends to last for. |
| cv643d Posts:1197 | May 27, 2007, 09:15:02 PM My 1230IV got very hot. But I asume it was safe. |
| lorddef Posts:1146 | May 27, 2007, 03:56:54 PM You must live somewhere hot, or have a bad 030. I had a blizzard 030 pushed up to 60mhz and it didn't get anywhere near hot enough to warrant a heatsink. My blizzard 060 on the other hand seems to have been made with a full but somewhat retarded 060 that gets really hot. I put an old pentium passive heatsink on it and it seems to be ok, still very hot though. |