12 September 2013

One of my Mini ITX build prototype

After months of browsing thru the internet about which works and doesn't I've come up with some prototype builds for mini itx's or SFF or HTPC. It all depends on what specific requirements you'll use it for - but most importantly, the biggest advantage hands down is mini itx's are compact, draws less power, and easy to move around.
My Build No.1
There are really quite many configurations to toy around with. In fact, more and more computer parts manufacturer are recognizing the huge potential of mini itx. But for this build I shall point out some personal reasons why I chose the parts mentioned here. I included the links should you need detailed info.
CPU, GPU, Motherboard integrated
For a bargain price, and a cpu cooler to boot, this config is a steal:
integrated Intel Atom motherboard
For a compatible RAM, I put these in (2 sticks):
SODIMM memory stick
To make the OS boot up real quick, this is the answer:
64 GB SSD
And to wrap it all up in a neat package, this is the case:
Note the various configurations for the mounting of HDD/SSD and case fans. But for this build I didn't put any extra fans to reduce noise.
Lastly to power it all up, a pico PSU for low power draw sufficient enough to supply all the components:
AC to DC power brick


power connectors
Okay there you have it folks, and if you're wondering how much it costs -  just around $400.

Here are the links for your perusal:
CPU: ZOTAC D2700 can be bought from here
SSD: A-Data 64 GB. Buy here
CASE: M350
PSU: picoPSU



04 April 2013

Proper desktop computer case cooling

Computer Case Cooling

With today’s computer chips getting smaller and more powerful, heat build-up becomes a primary concern. It is no wonder that computer cases have provisions to enable installation of fans of varying sizes and features. But what are the essential things to consider in achieving proper cooling? Be it that you a novice DIY rigger or a pro-extreme gaming rig enthusiast, some information that’ll be shared here would be of great help. For those who buy their computer all assembled or branded ones, read on please, as some sections of this post cover some issues you might have about cooling.
Important terminologies
Fans used for computer cooling, whether for an air-cooled setup or water-looped system, are simply used to move air. Air absorbs heat, which changes its density and hence lighter. So, even without a fan hot air will move or rise. This is called free convection. On the other hand, which is a particular interest to this post, forced convection is the movement of air by the application of the mechanical action of a fan. The most common specs that are of primary importance for a fan are its volumetric capacity rate, expressed in CFM (cubic feet per minute), and static pressure. CFM is a fan’s ability to move a certain amount (or volume) of air in a minute. Static pressure is a measure of a fan’s strength to move or push a corresponding CFM of air.

Air balance – what is it and why it’s important

Imagine a typical computer case as an occupied room, with the important components like CPU, motherboard, memory, video card and harddisk as its occupants. Through time, the heat generated by these “occupants” would saturate the air inside the “room” and becomes very uncomfortable for the “occupants”. By default, CPU’s when installed have a heatsink and a fan, much the same as with the video cards. But all these fans ever do is blow air into the processor, using the air in its immediate vicinity. However, that air is already hot and would not effectively absorb the heat generated by these components. This is where the concept of air balance plays an important role.
illustration of how air balance is achieved inside a computer case
The rate of air change inside the computer case should be such that it can sufficiently provide “new” or fresh air (cooler air) so as heat can be absorbed properly. Likewise, this warm air should be effectively discharged out of the case in pretty much the same rate or higher. This can be achieved if an intake and exhaust (outtake) fan are correctly installed in the case (please see figure 1). Ideally, exhaust fan(s) should have enough CFM capacity to effectively discharge the warm air out of the case, while the intake fan(s) should provide enough fresh air – in almost balanced quantity.

Air flow direction – do’s and don’t’s

As a rule of thumb, and to avoid confusion, computer case fans follow an unwritten convention that would show the air flow direction once they are on (see figure 2). With that known, installing the fans in the case would be easy – whether used for intake or exhaust.
side of fan where the brand label is usually shown
side of fan where the support frame for the fan motor is

It's a common mistake to improperly install fans. Doing so, could cause fans working against each other resulting in disrupted air flow direction. This is important even with installing after market CPU cooling fans. The fan direction for its exhaust should not work against the case fans installed either at the rear or on top of the case.

The arrow shows the direction of the air flow - this is a correct setup

the correct fan orientation or alignment for proper air flow direction

By and large, keeping this fan installation basics will greatly aid in managing your computer case temperatures and all its internal components as well. Happy computing!