Pros: Piece of copper with fins and an 60 mm fan with a fan grill. Super quiet and can be super loud whichever you want. Fan is easily replaceable as are the bearings.

Cons: At least 2u tall

Pros: - natively supports console over serial - can flash bios over serial using a terminal client that supports xmodem - supports up to 256GB of ram - has at least one pci express x16 gen 2 slot - IPMI (network KVM) - extra thermal sensors for hardware monitoring - I would say plenty of 4 pin pwm fan connectors, BUT (see cons)

Cons: can't control fan speeds (either with lm_sensors, IPMI, or web management tool. All of my fans are PWM, speedfan can control only the CPU fan. excess of sata and sas connectors that will never be used (because I rock a 12 port int and 4 port ext Adaptec card with battery backup, and may purchase an additional card just like it as a backup in case mine fails because I like the card so much.) Not a big fan of proprietary sata controllers or onboard raid, however i would be really pleased if I could change the mode of all the sata connectors to be esata then connect external drives. KVM/Qemu iommu support for VGA passhthrough is extremely lacking, also I had to jumper the onboard video to off and disable it just to get windows to install (otherwise the installer would crash every time, I discovered this by trial and error, almost threw a fit!) Ironically, this combination (onboard vga enabled and vga in the pci slot) worked fine in linux.

Overall Review: someday maybe I'll upgrade to that super micro board since supposedly somebody got SLI to work with it (not that I need SLI or really need to spend $2,000 for two 690s just so I can say I have 4 video cards worth of GPU....nah I'm torn between maybe finding out if quadro's stereoscopic 3d is something of interest to me.

Pros: I fit an ax1200i psu, two thermaltake x6 drive canisters, (had to unscrew them inside of the slot and slide them forward then slide them back after the power supply was put it because the cables are right on top of each other!) an asus kgpe-d16, an adaptec 51245 controller, a gtx 260, and 4 60mm pwm fans in front (replaced the back two 120mm with pwm and managed to fit 1 80x80x38mm fan in the back (only one, the other one is too tall because of the 120 mm fans.)

Cons: I won't be able to install a blu-ray drive internally, it'll have to be external.. 60x60x25mm PWM fans were NOT easy to find (necesarry if you want front intake fans and have an SSI form factor board.) Not on newegg, and even after googling I found a strange site and took a chance and paid 50 bucks for like 6 of them. They're totally legit though.

Pros: holds 6 2.5 inch drives in a 5 1/4 bay! The sleds are great, don't push them all the way in unless you have drives in them and be careful still.

Cons: They're not real hot swap backplanes. They lack a few things like I2C and other things that real RAID adapters support. I'm also scared that like one of the "pseudo backplanes" I bought a long time ago that the sata connector on the back might be surface mount and could break off easily ... pain to solder back on .. be careful! It would be nice if they made some that just had a sas connector on them and maybe i2c... also I wonder about replacement sleds.

Pros: ultra thin, crisp display, neat design, had windows 8...

Cons: Weirdest BIOS ever. I cannot for the life of me figure out how to server a UEFI PXE client... windows server must have some kind of weird support for this that nobody in the pxe/gpxe community reall knows about. Only legacy PXE works... It's impossible to find recovery software for this thing if you blow away the recovery partition on the hard drive. I'm not even thinking about calling lenovo to deal with that, so I installed windows 8 evaluation on it and took it the pawn shop. the touchpad is terrible. Between trying to click and point at the same time with it I often confuse it because the touchBad itself is the left and right click on the corners. windows 8 broken, wifi problems, it seems really undercooked.

Overall Review: No extended battery? seriously?

Pros: Well certified, good warranty, doesnt run hot, supports two 8pin ssi (was necessary for my asus kgpe-d16)and a bunch of sli.. more than ill ever have. It has a serial to usb adapter for controlling the fan speed and statistics. Connects easily to a spare usb header on the motherboard.

Cons: its big, the software is ugly and slow, and its not avail on linux even though its just more or less a ftdi to a uart. The packaging that it came in was way way over the top, I feel like I paid at least 100 bucks for the packaging somehow.

Overall Review: We shall see.... :)