The two things inside any computer case that generate noise are fans and hard disks. With hard disks, they can't really be stopped from making noise unless you power them down and I can't see a power user waiting for them to spin back up again.
I've seen cases where everything is mounted on rubber. The hard disks had special screws which clamped some soft rubber grommits meaning very little mechanical noise was transmitted to the chassis. This is the same sort of technology employed in cars, the engine gearbox and suspension is mounted on rubber and this stops the noise being transmitted to the chassis. Fans can be mounted on soft rubber mounts which will also help with mechanical noise transmission.
That sorts out the mechanical noise, now all we have to do is sort out the aerodynamic (wind) noise. You can get fans which have a thermal regulator built into the cable which regulates the fan speed according to temperature. If you mounted this regulator on your heatsink I'm sure you'd see a reduction in noise because the fan would only run at full speed when the CPU was hot.
Some heatsink and fan combos also produce a lot more noise than others. As a last resort you could try hiding the box under the desk.
Experiment and see what works for you.
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Who is "Quicken". Perhaps you meant Intuit ??
The two things inside any computer case that generate noise are fans and hard disks. With hard disks, they can't really be stopped from making noise unless you power them down and I can't see a power user waiting for them to spin back up again.
I've seen cases where everything is mounted on rubber. The hard disks had special screws which clamped some soft rubber grommits meaning very little mechanical noise was transmitted to the chassis. This is the same sort of technology employed in cars, the engine gearbox and suspension is mounted on rubber and this stops the noise being transmitted to the chassis. Fans can be mounted on soft rubber mounts which will also help with mechanical noise transmission.
That sorts out the mechanical noise, now all we have to do is sort out the aerodynamic (wind) noise. You can get fans which have a thermal regulator built into the cable which regulates the fan speed according to temperature. If you mounted this regulator on your heatsink I'm sure you'd see a reduction in noise because the fan would only run at full speed when the CPU was hot.
Some heatsink and fan combos also produce a lot more noise than others. As a last resort you could try hiding the box under the desk. Experiment and see what works for you.