Lolo, thanks for replying. According to GlobalScale's website, the heat problem is due to concurrently running the network interfaces.
The problem is directly related to heat generated by the load on the CPU. Having 2 x 1Gb Ethernets and WI-FI running concurrently with other interfaces, causes the CPU to work harder and a lot hotter. We have found the GuruPlug ‘s small enclosure , is not efficient as we would like at heat dissipation, therefore we suggest the following as a workaround. http://www.globalscaletechnologies.com/news.aspx
The GuruPlug Server “Plus” is designed in its current form for maximum usage with one Gb Ethernet port and one 10/100Mb Ethernet port. Whilst using the unit in accordance to these parameters will solve the majority of “heat problems”, it is highly recommended as an additional precaution you use 10/100MB speed connections for both Ethernet ports as it will further reduce the high temperatures on the enclosure surface.
At the time of writing, I think they were talking about the older model without a fan. After reading this article, I'm assuming that I can run my GP Server Plus without a fan (I'm also planning to add heatsinks) as long as I follow their recommendation to keep eth0 and eth1 at 100Mbps. This won't work?