Summary: Signifiant changes have occurred over the life of this switch. Version 1 had an internal fan and was quite noisy, albeit cool running. Version 2 & 2.1 eliminated the fan. However capacitor C251, sitting next to an internal heatsink is prone to failure after 6 - 8 months, resulting in dropped packets and link connections. Version 3.0 has solved this problem with a complete re-layout of the printed circuit board (PCB), with a redesign of the power/voltage regulation.
Summary: I own two of these, version 2.1 and version 3.0. Version 2.1 definitely runs too hot but after 2 years of being on 24/7 it is still going strong. Version 3.0 runs cooler and the performance on both is outstanding. I have 5 servers and 4 workstations in a lab setting, moving 40-60 GB files between them often, throughput is excellent with transfer rates upto 40-50 MB/Sec, so a 60 GB file transfers in about 20 min.
Summary: This excellent Ethernet Switch fully lives up to any expectations related to its prestigious manufacturer. Metal body: heavy, solid, durable-looking. Setup time: zero. Problems/bugs: zero. All three PCs having Gigabit capability in my home network immediately recognized the new 1GB bandwidth limit. And of course moving large files between them is now a lot faster.
Summary: Version v3 fixes the well known problems of v1 - noisy fan, no jumbo frame support. Also fixes v2.X issue of overheating. The SD2008 has gotten some justifiably bad reviews based on the earlier v1 & v2.x designs. I had a SD2005 (the 5-port version of the SD2008) v2 suddenly fail (no link on any ports) after 1 year, and Cisco issued an RMA and sent me a new SD2005 v3 switch, and I've had no problems with it.
Summary: Bought this switch and received the 2.1 version which is black. It is fanless or at least if it does have fans I don't hear them. Tested it and performance is good getting almost 1Gbit under all conditions (hard disks and other hardware being the limiting factor). Also tested it with jumbo frames and worked OK. Overall good buy, great speed with jumbo frame support at a nice price.
Summary: For a low cost switch this one works extremely well and is built very solidly. With the 10/100/1000 speed capability you can backup from one machine to the other (assuming you're running gig Ethernet NICs in the PCs), performance is great. I've read reviews that say this unit runs very hot but I am not seeing that. It is slightly warm and that's about it. I highly recommend this one.
Summary: I have bought both the old version of the Linksys SD2008 about 2 years ago when first released and everyone is right - Loud, and unacceptable when sitting on a desk next to you. I am lucky that I built a server and placed it and all networking items in basement so it did not bother me. I did hear it when I went into basement thought. The fan started really getting loud about 3 months ago and it just died in the past week but switch is still going strong.
Summary: I received the latest v3 revision of the Linksys SD2008 8-port Gigabit switch, it has no fan, therefore no fan noise, it's dead quiet. Other than the lights, you'd never know the thing was even powered on. I don't believe it's fair to rate a product based on fan noise anyway, but wanted to clarify that Linksys has removed the fan in the latest version of these switches.
Summary: You can rely on Cisco. Once I plugged it in, it's been working like a charm. It does its job and that's all there is to it. This is not a complicated device; it's there to allow fast speed connection between your Gigabit Ethernet ports on your computers. And it does it well.
Summary: I guess some of the earlier versions of this switch had heat and noise issues. I bought mine in March 2009 and it's been working flawlessly. No noise at all and the case is barely warm to the touch. Just plug in the power supply and CAT5E cables and away you go! No brainer simple.