Build Quality
As we already know the Lian Li SP750 a single 92mm fan design that is similar to the preferred 80mm cooling solution by some brands. The major downside to this fan design is that to move a sufficient volume of air to cool a high output power supply it must spin very fast resulting in elevated noise levels. While these 92mm designs are not great for quiet computing environments the key criteria in our evaluation is whether or not the cooling solution is sufficient.
External Build Quality
The exterior of the Lian Li SP750 is advertised by Lian Li as being a refined look. You know what? I think that advertising is correct. The overall look of the Lian Li SP750 is one of the more refined-looking PSUs we have seen. It is not because of anything major but it is all in the details. The finish is not just a flat black or textured black finish. Rather, it is more of a black brushed aluminum finish. That even includes the screws which is one of those attentions to detail that is starting to border on obsessive.
The modular interface is also well labeled. However, the actual Lian Li branding on the side of the unit is applied via a sticker which seems like a weird choice given the precious obsession with quality finishes. Other than that, everything here is standard for an overhead 92mm fan-sized SFX unit.
The Lian Li SP750 comes in at a total length of ~4 inches while the cables come in at a length of ~7″ to 19″ to the first or only connector. Additionally, the cables are all FlexForce style cables or individually sleeved cables.
Internal Build Quality
Once we open the top of the Lian Li SP750, we see a rather cramped unit that generally looks like other SFX units we have seen built by Enhance. However, that is to be expected from high-powered SFX units as there are only so many ways to arrange things in such a small space. The topology features a resonant LLC primary with a synchronous rectification secondary and DC-DC VRM’s for the minor rails. The fan cooling this unit today is a hydraulic bearing fan from Yate Loon rated at 0.60A at 12v and it is paired with three large(ish) heatsinks of varying shape/configuration. Lastly, the soldering is generally neat but there are a couple of hand touch-ups visible.
The SP750 input filtering begins upon the housing itself where we find some X capacitors and Y capacitors. The balance of the input filtering is found on the back edge of the main PCB. There is then a bridge rectifier next in line attached to a heatsink. The APFC power components are next and they are followed by the APFC coil. Speaking of this heatsink, the main input capacitor is right next to it and it is provided by Nippon Chemi-con with a rating of 400v 470uF 105C. Next to this are the main switchers attached to another substantial heatsink in the unit.
The secondary side of this unit looks crowded once more, but what do you expect? It’s an SFX unit and it is 750W in capacity. In the middle of this area, we find the main transformer. Surrounding this is a heatsink that is attached to the MOSFETs, which are on the back of the main PCB, and use the case as a heatsink as well. Next to this, we find the DC-DC VRMs housed on their own PCB (populated by unidentified solid capacitors) up against the modular PCB and edge of the main PCB. In front of these PCBs, we find a few solid electrolytics. The modular PCB construction looks very nice and there are more solid capacitors of unknown brand here as well.
Build Quality Summary
Today’s Lian Li SP750 is the first SFX power supply we have seen from Lian Li and it seems to follow the general formula that other high-end SFX units do. The build quality looks very nice/excellent but this unit is, obviously, very small so it is a bit cramped. The exterior is alternatively one of the most refined and good-looking units we have seen but it is also a bit odd with the way the branding is applied. The integration seems to be very well done and the component selection is excellent to unknown as we see Rubycon standard capacitors as well as unknown solid capacitors. We also see a hydraulic bearing fan used in this unit. All in all, the Lian Li Sp750 looks like a well-sorted-out unit in general. Let’s move on now to the load tests and see how this unit performs!