4-pin CPU fan into 3-pin socket

[splatterhouse]

I just bought an Arctic Freezer 64 Pro from OCUK. I've got it installed and running and it's doing a great job, the only problem is that my mobo has an older 3-pin socket, whereas the Freezer 64 came with a 4-pin plug (with a notch between the 3rd and 4th pins so that it can be plugged into 3-pin sockets), and i've lost the ability to monitor/control the fan speed like I could on my old stock CPU fan. Is there any way to fix this? I suspect the fan is running at full speed, and since my CPU is at 29 degrees idle i'd like to be able to slow the fan down.

 

[splatterhouse]

The settings in the BIOS are exactly the same as they were before, Q-Fan enabled etc. The problem is that although the mobo may be slowing the fan down, I can't actually see what rpm the fan is spinning at any more so I can't tell for sure.