In this entry I'll describe how Fred's components are air cooled.
So, after removing the fan wall and unplugging the two fans in the back of the case there was no active cooling left. That's good for reducing noise, but not
enough cooling for the hard drives, the CPU and the SAS controller cards. Since the case is not mounted in a rack and nothing is placed on top of it, I decided to
use the space in the case lid to place larger fans.
My idea was to replace the CPU cooler with a larger one that just fits into the case and have a fan above it suck out its hot air (also pulling in ait from the
RAM modules next to the CPU socket). I fount a heat sink from Scythe called Iori (SCIOR-1000). Mounted on the socket there would be just enough space for a 15 mm fan
above it. As it turns out though, the heat sink is large enough to cool the CPU passively and the RAM doesn't need any additional cooling, too. So the fan above it
is not even plugged in.
The Extension Cards
Since the HBA and the RAID card that I'm using are designed for servers with a proper airflow, they need at least some additional cooling. Their heat sinks are
quite small for the amount of heat they produce. But there was enough room above them to place a fan that sucks the hot ait directly from the extension card area out
of the case. I was told these cards usually don't have any problems getting extremely hot. But I rather don't want to have them do their things for hours or days
streight without any active cooling. Replacing their heat sinks with larger ones would only be a sufficiant option if there was room for much much larger heat
The Hard Drives
I don't want to have have hard drives run continuesly without any active cooling, especially when they are sitting in enclosures that don't allow for any aitflow
without some amount of pressure. There is just no-where for the heat to go on its own in these tight drawers. I decided for three 140 mm fans that would neatly in a
row behind the hard drive compartment and backplane. Since the motherboard isn't that large, there was nothing but a few cables in that area of the case. I've
mounted an aluminium bar that I had lying around and tucked two pieces of flat plastic between this bar and the bar that originally held the fan wall at the bottom.
That way, the air that is pressed in from above gets directed only into the hard drive compartment where it has no way to escape without passing the hard drives.
Unfortunately the room around the hard drives is so small that quite a lot of air preassure is needed to cool them as much as I wanted to. Running the fans at
full speed all the time is hardly enough to keep them at a temperature that I deem acceptable. I tried to increase the cooling effect by sealing all the edges and
other tiny spaces where some air could escape without cooling the hard drives. But this didn't lead to a measurable difference. I ended up taking out two of the 16
hard drives to increase the size of the duct. I chose two drives in the centre so that there now is a large surface where the air cools the remaining drives. That
lowered the temperatures of the surrounding drives a lot. The temperature of the drives at the edges was of course hardly effected. But those weren't the problem
I'll probably continue about the rest of the case mod in a followup entry.
Making the holes for the fans was easier than I expected. I marked the borders with a pencil by following the outlines of the actual fans, cut the rough holes with an angle grinder with a cutting disk, then did the finishing with a rotary tool (a not Dremel).
I used up several cheap grinding bits for the finishing. The remaining borders between the fas are only a few millimeters wide. But the ~2 mm thick steel holds up surprisingly well. They don't make regular home computer cases from that material.
First coat: primer, second coat: matte black, thirdly added sparkly sprinkles. In the picture I started taping the sides for what comes next.
Then I painted the middle part pink. After the tape was removed I noticed the paint came off in one spot. Well, that's how it goes if you don't do it right. I can just cover this with a sticker. For now I just added a matte clearcoat.
In between cooling systems. I tested the modded lid as it was in the picture but closed. It did do something and it was better than the open case with scattered fans in the next picture, but not by much.
That's how it looked for a day while I used the NAS before finishing the new cooling system. Notice the large space in the middle. That will be used in the next pictures.
This is how the case looked inside now. (I'll write about the power supply in the next entry.)
And from the outside. The fan on the bottom right cools the RAID card and the HBA. I don't know if it's cooling it enough because I don't know what the cards/processors are made to withstand. But they still ran a few years after that picture was taken. The CPU fan is off because it stays cool enough during a hours-long burn test.
The cooler mount wasn't made for that socket. I think it was for an AMD socket. The bracket was really strong and tight and eventually broke in two. The CPU lid didn't take any damage though and I simply used a few zipties to hold the cooler in place without much preasure on the CPU. That still was enough to cool the CPU passively and the machine ran three quarters of a year that way.
Eventually I made my own bracket (not in the picture) and now that is held down by zipties. It's quite sturdy.