Saturday 20 October 2012

Moment of truth

This week all the parts have arrived for my new computer. I worked on various aspects of it over several nights this week and the assembly was finished last evening. Having elected to build a fresh Windows 8 install, and the Windows 7 image  of my previous computer being on the disk I was putting into the new one, I used Ghost to do a direct disk to disk copy onto another disk. I then put this disk into the new computer and started setting it up. There have been a few hiccups, the first was when Windows 8 Setup generated the infamous “Can’t create or locate a partition” error. I thought at first it was a problem with the pen drive and external HDD I used to boot and run setup, but changing to a bootable DVD did not make the error go away. Eventually I discovered that removing the RAID controller card from the computer before running setup enabled it to work. The card was put back in once Windows 8 was running and with its drivers installed it functions flawlessly as should be expected. A second hiccup has been with the onboard USB3 controller which is an Intel Extensible Host Configuration Interface. When I plugged in an ext HDD to these ports it kept disconnecting itself after a short time, so I installed the 4 port USB3 PCIe x1 card that I had in the previous computer, as its drivers gave no trouble under Windows 8 on that computer. I have decided to keep this card in the computer regardless of whether Intel fixes their drivers or not, since I can always do with extra USB ports on the back of the computer, and because I don’t have any way at present of connecting anything to the USB3 connector on the board which would enable the onboard ports 11 and 12 to be used. Once I got the system up and running I set up Hyper-V Platform and have already created a couple of VMs to play with. I also have VMware Player installed. The rest of today has been spent on reinstalling software and working with the other computers.

The entire configuration is as follows, nearly all the items were purchased from Ascent or are available from them.
  • CPU: Intel Pentium G2120 “Ivy Bridge”. This slots into the range below and at a cheaper price than the lowest spec Core i3 processor. It has 2 cores but is not hyperthreaded. It supports Intel VT-x and EPT for virtualisation, but not VT-d. I decided to save about $40 over the cheapest Core i3 processor with this but performance may be a little worse due to only 2 threads being supported instead of 4. Came in a boxed package with with a heatsink and fan. LGA1155.
  • Mainboard: Intel DB75EN – 7 Series “Ivy Bridge”. A lower end board although it still has many useful features. 2x PCI slots, 1x PCIe x1 slot, 1x PCIe x16 slot, 5x SATA ports, 12 USB ports, VGA and DVI ports, parallel port, 1x PS/2 port, 1x serial port. 4x DIMM slots. 1x CPU socket LGA1155. All SATA ports can be configured for hot plug. Parallel port is interesting, to see these appearing in boards again. Single PS/2 port for either a keyboard or a mouse, or both with a splitter (I have used USB for years so this doesn’t bother me). The CPU socket is a bit different from the LGA775 with the load plate on top being secured differently and another metal plate underneath the board, which helps to prevent the board from bowing when the heatsink is put on. One of the things I thought quite interesting when I built my LGA775 system was how much the board inevitably bowed because of the pressure on the top of the CPU from the heatsink which is attached by four posts to the board. It was quite different with Socket 7 where the heatsink was attached by metal spring clips to the socket itself. These clips were very difficult to attach and I once blew up a board by gouging a track next to the socket while trying to get the clip on or off. The attachment system with posts onto the board as used for some years now is much easier. The heatsink itself is about half the height of the one on my oldest computer’s current “Prescott” CPU, due to the great improvements in the more recent CPU generations in reducing the power usage of the CPU. Onboard Intel HD3650 graphics which is dual headed with the two connectors.
  • Memory: 2x Kingston KVR1333D3N9H/4G, 4GB, DDR3-1333, PC3-10600, CL9. I had planned to buy one 8GB DIMM but they were out of stock of these so the pair has been put in instead at slightly higher cost. Although the board will support up to 1600 MHz memory, in practice this is hard to come by. As the board supports dual memory channels having a minimum of two DIMMs installed it is possibly somewhat faster than a single device. Both CPU and board support up to 32 GB which is achievable with all four slots containing 8 GB DIMMs.
  • Chassis: Inwin C583 Mid Tower chassis. 3x 5.25” external bays, 2x 3.5” external bays, 3x 3.5” internal bays. Comes with Powerman 400W AXT12V power supply (which I exchanged with the Enermax Tomahawk supply in the previous computer). Some of the bays are toolless with pins instead of screws to hold devices in place. The front panel and sides simply clip on and off, and clips are used rather than screws on some of the card slots. It is a clean modern design but only has a pair of USB2  ports and two audio ports on the front panel. A card reader will fit into the 3.5” external bay without any adaption, whereas I had to modify the Foxconn TS001’s bays to fit the card reader in the previous computer. All the bays which use pins allow the pin spacing to be adjusted to suit different devices. The internal drive bays swing out for easy installation/removal.
  • Power supply: As mentioned the Enermax Tomahawk 405W ATX12V supply. Plenty of connectors although we could do with fewer Molex and more SATA power connectors as not one single device in this computer (so far) needs a Molex connector and I have had to use at least one Molex to SATA adapter. This supply is enclosed in a black case.
  • Card reader: Hewlett-Packard AR941AA with slots for CF, xD, microSD, SD/MMC, MS. Requires one USB2 dual header on the mainboard for the captive cable supplied. USB2 external socket on front panel. Maps to 5 drive letters by default but can be remapped to 5 folders on an existing hard drive under NTFS. Having a microSD slot means you don’t have to use a flaky adapter. It comes in a 3.5” form factor with a mounting kit for a 5.25” bay.
  • Drives: Boot drive is a Seagate Barracuda 7200.12 of 250 GB. Data is stored on a pair of WD Caviar Black 1 TB drives connected to a Promise TX2300 controller (PCI slot) in a RAID-1 array. The system will soon have a Raidon InTank ST1000 removable drive bay installed. The internal eSATA port is connected to a rear panel slot connector. The InTank will probably be connected to one of the standard SATA ports and it configured for hotplug as provided for in the Bios. ASUS lightscribe capable SATA DVD drive.
  • USB: The board provides six rear panel USB connectors (pair of USB3 and four USB2). Onboard headers provide for four more USB2 and two more USB3 ports. Due to driver problems with the USB3 ports I currently use a Megapower MC1A-00188-G00 PCIe x1 card (Dynamix AOC-PE-U34P) which has an ETron onboard controller and provides four USB3 ports on the rear panel). With one of the onboard USB headers required by the card reader, I opted to put a 2 port USB2 slot adapter on the back of the computer instead of connecting the chassis’s pair of front panel USB2 sockets, as the card reader provides a USB2 socket of its own on the front panel. It could be that in time especially if I can get those two rear USB3 ports working reliably I will connect up the two front USB2 ports or perhaps there will be a drive bay adapter for two front USB3 ports to connect to the unused board header.
The assembly was fairly straightforward. The trickiest part is always going to be installing the CPU. Because the CPU goes into a socket with over a thousand pins on it, you just have to be very careful to put the CPU in place to avoid bending any of those pins, and you don’t want to be clumsy and drop the CPU while you are at it. Then carefully close the load plate and locking lever. Phew. I elected to build the board outside the chassis to check it was going before I put the power supply and assembled board into the chassis. The Inwin C583 has nine standoffs built into it, 6 of which were needed while 2 standard brass standoffs had to be screwed in place for the remaining pair of mounting holes. At least there are not any mounting holes under a CPU socket these days, there was at least one Socket 7 board produced by Asus or someone which had this “feature”. This board at least has mounting holes in line with the main power connector, on the DG41RQ pushing in the power plug will bend the board unless you make sure to support it because the mounting holes are set back from that edge.
IMG_0490
The assembled board before installation in the chassis.
IMG_0491
The completed chassis. A little different now with the USB3 card installed and down to one DVD drive. Plenty of fans, the power supply and chassis both have 120 mm fans to help remove heat.

Monday 15 October 2012

Intel Mini-ITX Boards with embedded Atom CPU

An interesting range of product can be found in Intel’s lineup of Mini-ITX boards with the NM10 chipset. These have an Atom CPU embedded on the board and the price is about the same as a current B75 chipset board like the one I am buying for my new computer. There is quite a lot in favour of upspeccing an old worn out system like my Intel D915GAG which was what I had before the one I have now (the DG41RQ) to something that has years of life left in it and can run the latest OS without too many problems. The NM10 chipset is the first real effort by Intel to make a decent low power system. The Atom appears to be made with embedded in mind, I didn’t see anything that looked like a socketed chip or board looking at Ascent’s web page. The board I settled on is the D2700MUD with 2 SO-DIMM slots for maximum of 4 GB @ DDR3-1066, 1 PCI slot and 1 PCI Express Full Mini slot, onboard VGA and DVI, onboard 5.1 audio, onboard 1Gbps networking, 2 SATA ports and 7 USB 2.0 ports. The specs tell me it is 64 bit capable although this is a moot point with the memory limitation.  The board measures a measly 17 x 17 cm. The kicker is that it will fit into any Micro-ATX chassis as well, because Intel has designed Mini-ITX as a subset of Micro-ATX, meaning the mounting holes, expansion slots and I/O ports are in the same place as the larger board; and its power supply requirements should work with an older ATX12V 1.2 supply like my old computer has. The specs say a 2 x 10 power plug can be used, which is what that Enermax supply has (it works just fine with the D915GAG which has a 2 x 12 socket, like the D2700MUD) and so that is quite a saving in cost to begin with, being able to use an old chassis and its power supply as well.

What do people use these systems for? The typical system of this type is used for home theatre because with no fans needed for cooling, these systems can be extremely quiet. As it happens of course the hard drive and the power supply’s fan will make a bit of noise. In my case I want to use the system for a test platform for work related purposes. Pretty soon I will have a system that can build and run virtual servers. At that point I really also need a desktop I can hook up to a virtual server and test stuff with it. The board costs around $130 at today’s prices and with the 4 GB of RAM being the only other item needed, at around $30, the all up cost is very low and favourable for a brand new system. However its performance won’t be much better than what it replaces and therefore it really is only useful for testing and not really serious work.