fan controller for new pc

[4runna]

http://www.newegg.com/product/product.asp?item=N82E16813999504

i have a pc with a few case fans and a cpu fan. it's a cpu fan that turns on and off, i was told if i wanted to oc i'd better get a good controller to ensure it stays always on.

here's my pc

-AMD X2 3800+
-DFI Lanparty NF4 Ultra-D
-XFX Geforce 7800GT 256mb
-OCZ Performance 2GB (2 x 1GB) 184-Pin DDR SDRAM Unbuffered DDR 400 (PC 3200)
-ZALMAN CNPS7700 Cooler
-OCZ Powerstream 520w

-Old hard drives that arent that good

thanks