ASRock Rack Mini ITX DDR3 1333 Motherboards (C2550D4I)

I wrote this review for the C2750D4I but I added it here too because the C2550D4I is the same exact thing except the 2750 has a more powerful CPU. As far as everything else features and what not they are the same. So take that into consideration when reading the review or when deciding what model to get. Hope this helps someone make the right decision for them! This is a great little board with lots of potential and many different possible configurations. Obviously this is a perfect build your own NAS solution, but to tell you the truth if that is all you plan on using it for then get the C2550D4I model. The C2750D4I model has more than enough power to do much more, will be a perfect headless small business or @home server. I can not tell you how the board perform with Windows Server Op systems, but with Linux Server distros, even running multiple VM's great performance. So rather that just install something like FreeNAS you can install a Debian/Ubuntu/CentOS/RHEL/SuSe server distro as base and then the possibilities are endless from there. You can run many different protocols/daemons without any issues. Many will say but it has an Atom processor, just because Avoton to the name its still an Atom. This is true but I was happy with the performance compared the the previous generation, it is not Xeon this is true, but you will be surprised what you will be able to do with this chip. It has 8 dedicated cores (not 4x cores with H/T =8 cores, but 8x cores without H/T =8 cores), Also supports VT-x, EPT, and AES-NI. Here is the huge (746 pages) Intel Atom C2000 Microserver Datasheet: https://www-ssl.Intel.com/content/dam/www/public/us/en/documents/datasheets/atom-c2000-microserver-datasheet.pdf The board takes 1600MHz ECC UDIMM's and 12 onboard SATA channels 6 of which support RAID (Marvell SE9172: 2 x SATA3 6.0 Gb/s RAID 0/1, Marvell SE9230: 4 x SATA3 6.0 Gb/s RAID 0/1/10), issues with the Marvell SE9230 chipset have been resolved with a recent firmware upgrade. Here is my breakdown of how the SATA channels are best used: 6 of them are Intel C2750 ports (2 x SATA3, 4 x SATA2) everyone knows whatever the Intel SATA ports are rated as thats what you will get, the same can not be said with Marvel chipsets but we will get to that later. Many people will say why the hell even have 4 SATA2 ports they are useless nowadays, but this is not true. Most people don't even understand how SATA channels are used, and how they impact or do not impact performance of the SATA devices. Just because a device is SATA3 DOES NOT MEAN YOU WILL BE GETTING 6.0 Gb/s in/out transfer speeds. All that is the link speed, that is just what that channel is capable of handling, but unless your SATA devices are capable of producing in/out speeds greater than around 300MB/s you will not see and performance degradation using it on a SATA2 channel as apposed to a SATA3 channel. That being said the 2 Intel SATA3 ports are ideal for SSD drives, I setup one of these boards with 2 Samsung 850 Pro SSD's in the 2 SATA3 port and used Linux software RAID as the root partition and easily got speeds over 1GB/s NOT 1Gb/s thats over 1000 MEGABYTES/sec. So the 4 remaining SATA2 ports would be great for mechanical hard drives or other type devices ie. optical drives. So then You are left with 6 more SATA3 ports on the marvel side of things. The only time you should really see a difference between the Intel SATA3 ports and the Marvel SATA3 port performance is if you are using high speed SSD's. Its just a fact of light that Intel SATA channels are better than Marvel, but with the Marvel chipsets you get a wide array of RAID feature with a whole bunch of buzzwords attached to them. I tend not to go down that path, I would only use the onboard Marvel RAID ROM for RAID0, RAID1, or RAID10, not any of the SSD/HDD hybrid caching services. If I wanted to go down that road I would set it up with software rather than using the Marvel ROM. Thats just personal opinion formed from experience, others will swear by it, and Marvel will show you all kinds of stats that makes it look like a no brain'r but again just not my thing. If you are interested in running a RAID 5/6 array well you can't with the equipment that comes out of the box, but thats what the PCIE 2.0 x8 port is for. There are plenty of great performing hardware RAID cards available in that format. The board has a dedicated BMC NIC as well as dual Intel i210 Gigabit LAN ports (with Teaming function), so you have several options for networking/system administration. You can use the dual Intel LANs as a team for the main network connection, and the Realtek RTL8211E to manage the BMC on a totally separate network, use the dual Intel LANs as a team for the main network connection and the board will emulate the BMC mac so you can access it without having to use the Realtek RTL8211E port, or you can just connect one Intel port for main network and BMC emulation. So that leaves you with many options to choose from with a wide array of networking possibilities. Unless you have worked with Enterprise class equipment and/or purpose built servers the words BMC/IPMI mean nothing to you. An over simplified definition of these things is basically Remote System Management, many will say so what I use VNC, Remote Desktop and what not with regular computers. But this is so much more, once it is setup you can do anything from a remote location you can do if you were sitting in front of the board itself. Complete power management from Off/On/Reboot, Virtualizing Media (using local CD/HDD/ISOs on the remote server), and a whole bunch of different management tools and toys. So you can see why the average user could be excited by the little board with a lot of bang for your buck, Enterprise @home! So from the C2550D4I model, up to the C2750D4I model, with all the different add-on bells and whistles you can get for it, you can get anything from a nice and cheap home built NAS solution up to a pretty damn well performing Linux Server without the need to shell out thousands of dollars. So overall I give it 4 out of 5 stars, it is not perfect, but its definitely better than average as far as I am concerned. NOW GO BUILD AND LEARN SOMETHING!!!

Not a fault on ASRock in and of itself. But the Atom processor is affected by a widely known flaw. Since I'm well outside of the manufacturer's warranty, I just have to eat the cost. Hopefully there will some sort of class-action suit against Intel. Unfortunately I cannot recommend that anybody use this product unless they need a very short-term solution.This ain't your granddaddy's Atom processor. The price made me a little hesitant, but I plunged ahead anyway. Here are some geeky thoughts:The POST takes forever (with 32GB of ECC RAM). I seriously thought that I had a DOA unit and just left it alone for about 10 minutes. After applying the latest BIOS update, the process seems to have sped up a bit. Additionally, the latest update seems to have disabled the Aggressive Link Power Management setting which has anecdotally been linked to shredding drives.There aren't any USB headers on the board itself, if you want anything in addition to the two USB 2.0 ports in the back, you'll need to install an expansion card.I was so impressed by my initial benchmarks that I decided to forgo my plans to use FreeNAS and instead go with a more generic installation of Debian. The processors are more than able to handle the other trivial workloads (DNS, DHCP, PXE, NGINX, PostgreSQL, etc.) that I had a separate, dedicated server for. The installation process was a breeze, no 3rd party drivers needed with everything being automatically detected by the Debian 8 installer. ZFS on Debian is a stable package and at load uses about 14GB of the 32GB of RAM that I have installed. Seriously, if you plan on using ZFS, don't skimp on the RAM.I was nervous about having so many SATA connections in such a dense arrangement, but the ports are far enough from one another that my straight (not the 90° ones) SATA cables with the end clips had no issues. Something else to keep in mind: Buy good SATA cables. You're going to have so many running so near to each other that noise can become an issue if you get the cheap ones. It's worth shopping around and getting the smallest lengths that you can find.The manufacturer recommends that you do not boot from the SATA3 controllers (the white connectors), this means that your OS will be on a SATA2 port, it shouldn't make any difference since your data will still benefit from the higher speeds.The IPMI port (I didn't do enough preliminary research to even know that it was a feature) makes my KVM setup feel like a tool from the neolithic. Linux/BSD geeks will likely only use it in case of emergencies, but I can see it being very useful to those who go the Windows route.With all of the aforementioned services running, a LAN file transfer at 800Mbps, a 60Mbps download from the internet, and a large archive decompression my average processor usage was about 45-60%.I've only had the box up for 2 days, but so far I'm very impressed. If you're looking to build a dedicated NAS, this motherboard may be overkill, but if you're looking to consolidate several roles onto a single server it can certainly handle a reasonable prosumer amount of work.

I had 2 of these boards delivered by Amazon ( great service ) and both did NOT work. Amazon kindly refunded me, but I'm left with 2 x EEC ram that I also bought from Amazon that I can NO longer use or need. Cannot recommend this motherboard at all.