Assembling the Lian Li PC-A55

Credit where credit is due, Lian Li's PC-A55 came together very smoothly. Usually smaller enclosure designs are difficult to assemble and somewhat involved, but the PC-A55 is very clean and logical and I seldom had to consult the instruction manual to figure out how to get everything to fit inside it.

Starting with the motherboard, while clearance around it is minimal, I'm always happy to see the stand-offs come preinstalled. It's a simple, thoughtful convenience that saves time in the long run. While ordinarily I attach the modular cables to the board first and then plug everything into the power supply at the last step, that's not possible in the PC-A55 due to the reduced clearance between the power supply mount and the drive cage. As a result, I actually connected the necessary cables and installed the power supply almost immediately after installing the motherboard.

Note that we're using a Micro-ATX motherboard as usual, but the only real difference you'd see with a full-size ATX board is that it would be "taller" in the pictures below. Our test board is just as deep as a standard ATX board, but it doesn't have as many expansion slots.

Installing the power supply involves removing a bracket from the bottom front of the enclosure. The power cable is already routed through this bracket and is easy to connect to the power supply, but when we put the PSU and bracket back inside the PC-A55, we discover what I would consider a potentially serious design flaw. The PSU can only be oriented one of two ways: either the bottom-mounted intake fan faces the interior of the case, disrupting the intended airflow, or it faces the inside of the front panel, in which case it's blocked off entirely.

At this point I also learned that the drives should probably be installed first. I had to remove the RAM from the motherboard to fit the 3.5" drive into the bay, though the 5.25" drive was able to slide in from the front of the PC-A55 relatively easily. Note that it's entirely possible to butt the 5.25" drive up against the edge of the motherboard, too. Unusually deep optical drives (like LG's combination HD-DVD/Blu-ray drive) simply won't fit without sticking out of the front of the case. 2.5" drives still use Lian Li's traditional bottom-mounted rubber grommets to slide into the two mounts.

Getting the video card in was easy enough, though, and wiring the PC-A55 was surprisingly simple. Our test SSD does press up against the bottom of the PC-A55, making it a little more difficult to get the data and power cables connected, but it's a minor quibble in the scheme of things. What you have to remember is that because the PC-A55 lacks any space behind the motherboard tray (and is small in general), there's really nowhere to put the cables except to cram them into the space beneath the drive cage.

Once I crammed everything into Lian Li's PC-A55, I immediately realized just how poorly the thermal design might actually perform. Here's the essential problem: if you install a full-height video card, about 75% of the bottom-mounted intake fan is going to be blocked by it, substantially reducing any air that comes in through the case's single intake, leaving the top-mounted exhaust fan to pick up the slack. This also means that multi-GPU is going to be basically out of the question, since the gap between the video cards is going to be basically dead, having nowhere to actually take in air from.

Things get worse. The rubber pegs the case stands on are only about 15mm high, meaning that in the best-case scenario, the intake vent of the PC-A55 is only going to be about 15mm off of the ground. The fan filter shaves another 3mm off of that. This is why every case I've reviewed thus far that had a bottom fan mount left that mount optional and didn't rely on it, excepting the Silverstone cases which all stood at least a full inch off of the ground, allowing for a healthy amount of ventilation and clearance even on carpet. Bottom line: the PC-A55 more or less can't be used on any carpet of any kind, as the bottom intake will be suffocated by it.

In and Around the Lian Li PC-A55 Testing Methodology
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  • Iketh - Saturday, June 16, 2012 - link

    I already have 3 HDDs installed, why do I need the cage? Reply
  • Iketh - Saturday, June 16, 2012 - link

    BTW, that's a passively cooled 2600k @ 4.3GHz at 79C with prime load WITH THE DOORS OFF

    however, evo + 2600k is lapped
    Reply
  • Olaf van der Spek - Saturday, June 16, 2012 - link

    Passive? As in no fans at all?

    Without the cage the case looks good.
    Reply
  • wifiwolf - Sunday, June 17, 2012 - link

    Doesn't seem right to passively cool the cpu and have fan in the front and back.
    The noise will still be there, having a low noise cpu fan there wouldn't add any noticeable noise
    Reply
  • Iketh - Sunday, June 17, 2012 - link

    then i guess when i tested the noise levels with and without and found a very noticeable improvement, i must be absolutely incompetent to make the judgement... thank you for showing me the path wifiwolf Reply
  • doctormonroe - Saturday, June 16, 2012 - link

    PC-X500/PC-X500FX in the mATX formfactor would be brilliant, hopefully it would be cheaper as well... Reply
  • etamin - Saturday, June 16, 2012 - link

    I've been wondering why Lian Li (or any other company) hasn't employed the 90 degree rotated design that Silverstone uses. Is it under patent protection? Reply
  • InterClaw - Saturday, June 16, 2012 - link

    It seems like a major mistake to not let the PSU get its own air from the front, especially since it dumps its hot air at the bottom of the case. The way it is now it just recycles its own hot air. Genius... This is beside all the other cooling problems what with the GFX blocking the flow.

    Dustin, I'm curious though why you mounted the CPU cooler horizontally and not vertically to help the airflow along. Was it not possible or is that deviating from the testing methodology since the heat sink might perform differently after being reseated?
    Reply
  • RanDum72 - Saturday, June 16, 2012 - link

    I cannot believe that the case designers never thought about where the PSU exhaust is going to come out. The heat generated by the PSU is dumped inside the case. They could have drilled some holes that aligns with the PSU exhaust but even that will also be picked up by the bottom fan and thrown back into the case. All form, no function. Reply
  • kesbar - Saturday, June 16, 2012 - link

    after looking at the thermal results, the PC-A55 has carpet burn. Reply

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