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[Miloo]

Whats the biggest heatsink and fan you can put on a 68040?

Ive just got an A3640 card without any heatsink and it
hasnt arrived yet so i cant measure it.

[Ross1]

There is no need to go any larger than the Motorola chip its self so a standard 2"x2" fan and heat sync will work. There are no restrictions as far as length for the heat sync but width cant be any wider as it will hit the A4000 riser.

[murple]

Yeah, I think the biggest heat sink you can use is defined by the physical space you have available. If you want to use a fan and heat sink, you can use a PC style combo sink/fan, or depending how much room you have (I use A2000 and A1200, never seen inside a 4000) you could use the biggest heatsink that will fit, and try to mount a fan in there drawing air across the CPU horizontally. I've even seen some Amiga accelerators which mount a heat sink on the CPU, and then a fan mounted to the circuit board on the opposite side. I'm not sure if that would be very effective though.