In short, the blower is just glued onto the side of the heatsink; I glued it after the heatsink was glued to the 68040, but there's no reason it couldn't have been done the other way around.
This setup has evolved over time; here's the story of the cooling solutions my Turbo040 has used...
Originally I mounted a normal fan on the end of the card stack to blow over the stock heatsink. This was highly inefficient because most of the fan was blocked; eventually that fan died. The SE/30 ran most of the time but would occasionally hang.
Next, I removed the stock heatsink from the 68040 and mounted a GeForce 4xx GPU HSF assembly with frag tape. This was also loud and quite inefficient but it was from a really cheap graphics card; the "heatsink" was crimped together in places and had really poor thermal conductivity. Sometimes the SE/30 would crash when it was hot outside. Also, the height of the HSF was slightly more than the stock heatsink, causing even more severe fitment problems in the card stack.
To improve upon this I put the stock heatsink back on and then carefully glued the blower to the side of the stock heatsink. The blower is the CPU fan from a dead white iBook, by the way. This worked OK but I noticed that the chip itself was *way* hotter than the heatsink. That was when I decided to try the "super glue in the corners, arctic silver everywhere else" trick which seems to have worked. When you touch the chip and heatsink, they feel like about the same temperature.
I wish there were enough room to just stick a Pentium III or IV heatsink on it and just call it done, but alas that's just not what it's like being inside an SE/30.
This setup has evolved over time; here's the story of the cooling solutions my Turbo040 has used...
Originally I mounted a normal fan on the end of the card stack to blow over the stock heatsink. This was highly inefficient because most of the fan was blocked; eventually that fan died. The SE/30 ran most of the time but would occasionally hang.
Next, I removed the stock heatsink from the 68040 and mounted a GeForce 4xx GPU HSF assembly with frag tape. This was also loud and quite inefficient but it was from a really cheap graphics card; the "heatsink" was crimped together in places and had really poor thermal conductivity. Sometimes the SE/30 would crash when it was hot outside. Also, the height of the HSF was slightly more than the stock heatsink, causing even more severe fitment problems in the card stack.
To improve upon this I put the stock heatsink back on and then carefully glued the blower to the side of the stock heatsink. The blower is the CPU fan from a dead white iBook, by the way. This worked OK but I noticed that the chip itself was *way* hotter than the heatsink. That was when I decided to try the "super glue in the corners, arctic silver everywhere else" trick which seems to have worked. When you touch the chip and heatsink, they feel like about the same temperature.
I wish there were enough room to just stick a Pentium III or IV heatsink on it and just call it done, but alas that's just not what it's like being inside an SE/30.