My second pc is air cooled and when i start it up i have to check to make sure it's running because it's so quiet. Spec is:
Intel Pentium Dual Core E6300@ 3.6Ghz (for the moment).
Zalman CNPS 9500 cpu cooler (came with the mobo).
MSI P45 Platinum (stock cooling as it's very good).
Sapphire 3850 Pro with Akasa Neo Vortexx.
2x 1Gb Kingston PC2 6400 LL.
Creative Audigy 2 ZS.
Coolermaster Storm Scout.
Enermax Pro 82+ 385w.
Zalman ZM-MFC2 Multifunction controller.
Fans in the Scout are 2x 140mm red led Yate Loon's and 2x 120mm Xilence red led fans.
The case is excellent for cooling although not normally my style of case, it was cheap, £65, and i saw a couple of good reviews so went for it. Brilliantly built and with excellent cable management. I only paid £66 for the MSI P45 Platinum with the Zalman cooler (P45 Zilent) which was a steal too!! The 140mm fans are running at 740rpm and the 120mm fans running at 800rpm. Temps in the case are very good. SB is at 28 degrees, NB at 26 Degrees, Memory at 26 degrees and the GPU idles at 32 degrees and hit's 49 degrees at load. Could'nt tell you what the cpu is at idle as it has stuck idle sensors but under Linx it hits 49 degrees with the cpu fan set to a very quiet 1500rpm. Unfortunately it can't go any lower but at least when i improve the overclock i have an extra 1000rpm to increase if i need to (CNPS 9500 full speed is 2500rpm).