Well, all the shuttle range use a clever heat pipe system they call ICE. Seems to work well for most people, but I'm not sure if you can buy it separately, as it is specifically the right size and shape for case/motherboard.
After trying many different fan arrangements I decided to go for a little Water . So now I have a SN41G2 with GlobalWin Slient Stream with two Noiseblocker S3 fans, Zalman northbridge cooler and some Copper Vantec Ramsinks. temps have drop about 10c from the I.C.E. system and it's now deadly silent ( aprt from the stock Radeon 9800Pro cooler.
Air cooling for me. I'm not going to try my first W/C set up in a Shuttle. I have the standard ICE coupled with a Tt SmartFan II (noisy, but crazy airflow). I keep it a little under half power. Removing the back grill dropped my temperatures about 5*C across the board. My idle temperatures are around 46*C with an AMD3000+ and a 9700Pro dumping heat into the case. My load temperatures are around 52*C.
I'm currently trying to mash a whole lot more into my little silverstone LS02 than was ever intended: albatron kx18D pro II NF2 mobo (full atx!) amd xp 2600+ @ 2000+ (underclocked ) panasonic/mat****a UJ-825S slim DVD RAM twin Samsung spinpoint 80GB SATA drives in RAID 0 ASUS 9520TD 128MB twin 256MB crucial PC3200 I've had to resort to some butchery to get both hard drives in around the optical, and i had to make new holes in the back to accomodate the SPDIF and FIREWIRE ports that came with the mobo (pics eventually under mods). I bought a Zalman CU7000 somethingorother, but it's too tall to allow a 25mm thick fan above it, so i'm using the "free" bundled leafblower that came with the board until i can get my hands on a zalman 80x15 VGA fan. I'm about 6 hours from Seoul, and I go there every few months. Zalman is made here, and the electronics market in Yongsan has awesome prices on that stuff if you look around. I had hoped to use 2.5" HDDs, but fujitsu and seagate are taking their sweet time producing commercial units, so I opted for the samsung's instead. I've considered taking the PSU out and making it an external box, but that makes things complicated for power wire lengths and interconnetcs etc. Bottom line is, there's a few noisy 60mm fansa inside, along with the AGP and n. bridge mini-shriekers, but i plan on having this thing dead quiet in a few months.
To make it cooler, therefore quieter. If performance isn't completely necessary (e.g. Fileserver or something), then why not?
Yes, it's a heat vs. performance issue. I can run it full blast, but it's not very stable, and the heat coming from the PSU and twin HDDs is enough to soften candlewax! If I can figure out a way to take out the PSU and mount it externally (like a standard AC/DC converter) that will help lower the heat, and also make room for my zalaman heatsink (CPS7000-CU ?), which currently is interfered with by the PSU.
It can be if you use the A64 bracket and a bit of brute force. Or you can just buy a Xice block that attatches by the socket lungs like I did