Overview
This Lian Li SP 750 — High-Performance SFX Power Supply Review looks at the SP750, a 750W, 80 PLUS Gold power supply in the compact SFX form factor. It suits builders who want to run an RTX 3070 to RTX 4070 class GPU with comfortable headroom in a Mini-ITX or other case with limited PSU space.
It is not a good fit for flagship GPUs such as the RTX 4090, or for builds that need a native 12VHPWR cable straight from the PSU. The unit is fully modular, uses a 92mm hydraulic-bearing fan, and has a zero RPM mode that keeps the fan off up to 40% load.
It reaches up to 92% efficiency, uses Japanese electrolytic capacitors, and comes with a 5-year warranty, which puts it in the quality-focused upper-mid tier despite its size. The aluminum top housing is styled to match Lian Li cases, which matters in small cases where the PSU is on display.
Key Specs and What They Mean
| Item | Value | What it means |
|---|---|---|
| Rated output | 750W | Plenty for one upper-mid GPU plus a typical CPU |
| Efficiency | 80 PLUS Gold | The PSU itself runs cooler, which helps in cramped cases |
| Form factor | SFX | Smaller than ATX; ATX cases need an adapter bracket |
| Cabling | Fully modular | Unused cables can be left out, which matters most in small cases |
| Fan | 92mm, hydraulic bearing | Small fan, so it tends to spin faster under heavy load |
| Zero RPM | Up to 40% load | Works out to about 300W with the fan stopped |
| Input voltage | AC 100-240V | Works on 100V household power in Japan |
| Warranty | 5 years | The service contact may depend on where you buy |
The figure that matters most day to day is the zero RPM threshold of 40% load. 40% of 750W is about 300W.
Web browsing, office work, and video playback usually stay under that, and the fan stays off the whole time. A 3D game on an RTX 4070 class system, on the other hand, will often push total draw past 300W, and the fan will start spinning.
It is more accurate to think of this unit as quiet at low load than as silent while gaming.
A 92mm fan is smaller than the 120 to 135mm fans common in ATX units, so it has to spin faster to move the same amount of air. Under long heavy loads it may be more audible than an ATX PSU of the same wattage.
That trade-off applies to SFX power supplies in general.
Compatibility Guide
Case Fit
The standard SFX envelope is 125mm wide, 63.5mm tall, and 100mm deep, and most Mini-ITX and SFX-L cases designed for SFX PSUs will accept it.
The dimensions field in this product data, however, reads 125 x 99 x 175 mm, which does not match the SFX standard. It may be the package size or some other value.
When checking whether the unit fits your case, use the manufacturer's specifications rather than this number.
Mounting it in an ATX case requires an SFX-to-ATX bracket. Check the listing or the box contents to see whether one is included.
SFX cables are also often cut short for small cases, so in a large ATX case the 24-pin or EPS 8-pin may not reach the top edge of the motherboard. For a roomy case, an ATX PSU is the simpler choice.
Power Connectors
The unit comes with the following connectors:
- ATX 24-pin x1
- EPS 8-pin x2
- PCIe 8-pin x3
- SATA x8
- Molex x4
With two EPS 8-pin connectors, it can feed high-end motherboards that want 8+8 or 8+4 pins of CPU power. There are three PCIe 8-pin connectors.
They can power a GPU with three 8-pin inputs, but whether any of them share a single daisy-chained cable affects routing and headroom, so check the cable layout on the product page.
There is no native 12VHPWR (12V-2x6) connector. With an RTX 40-series or newer GPU that uses 12VHPWR, you power it through the adapter that comes with the GPU by plugging PCIe 8-pin cables into it.
The higher-end the GPU, the more 8-pin inputs its adapter tends to need. Before buying a GPU, confirm that this PSU's three 8-pin connectors are enough.
Wattage Guide
| GPU class | Verdict |
|---|---|
| RTX 3060-3070 / RTX 4060-4070 class | Comfortable headroom, and the zero RPM mode gets plenty of use at low load |
| RTX 3080 / RTX 4070 Ti-4080 class | Workable but with a thin margin. With a power-hungry CPU, consider a higher-wattage unit |
| RTX 4090 class | Not recommended. NVIDIA's recommended system PSU is around 850W |
The GPU alone does not decide the wattage you need. A Core i9 or Ryzen 9 at full load changes the requirement a lot, even with the same GPU.
Start from the GPU maker's recommended PSU rating and add the CPU's power draw to it.
Product Info
The Lian Li SP 750 is an SFX power supply that launched in late 2021. It has 80 PLUS Gold certification, Japanese electrolytic capacitors, fully modular cables, a 92mm hydraulic-bearing fan, a zero RPM mode up to 40% load, and a 5-year warranty.
It accepts AC 100-240V input, so it works on standard household outlets in Japan.
Prices below are snapshots from the time they were captured. On Amazon.co.jp it was ¥42,614 as of May 28, 2026.
That listing is sold and shipped by APOLO1969, a marketplace seller, so the price is one the seller set. Once a product has been out for a while, prices often vary a lot between sellers, so compare other retailers too.
On eBay US it was $174.17 as of July 9, 2026.
Both prices change, so check the current price on the product page before buying.
Check the retailer's page for the latest user reviews. With so few reviews, a handful of high or low ratings can move the average a lot.
Rather than going by the score alone, read the low ratings to see whether the complaints are about dead units, fan noise, or cable length. That makes it easier to judge whether they would matter in your build.
Competitor Comparison
In the 750W SFX class, it is most often compared with the Corsair SF750 and the Cooler Master V SFX Gold. When comparing them, look at whether a native 12VHPWR (12V-2x6) cable is included, the warranty length, availability and price where you live, and cable length and flexibility.
If you plan to use a current-generation GPU, a native 12VHPWR cable makes a direct difference to how clean the wiring looks.
If your case can take an ATX PSU, the picture changes. 750W ATX units that advertise ATX 3.0/3.1 and PCIe 5.0 support, such as the Corsair RM750x and RM750e or the MSI MAG A750BN PCIE5 III, become options.
At the same wattage, ATX units generally cool more quietly with larger fans and tend to cost less. The whole reason to pick an SFX PSU is its small size, so choosing the Lian Li SP 750 for a build that does not need that brings little benefit.
Who Should Buy It
- Builders who want an upper-mid GPU in a Mini-ITX or other SFX case
- Owners of RTX 3070 or RTX 4070 class GPUs who want wattage headroom
- Builders who want the fewest possible cables in a tight case, thanks to full modularity
- Users who want the PSU fan to stop during low-load work such as office tasks or video
- Lian Li case owners who want the PSU to match the case
Things to Check Before Buying
It does not fit ATX cases on its own. As an SFX unit, it needs an adapter bracket to mount in an ATX case, so check whether one is included before you buy.
In a large case the cables may also be too short.
There is no native 12VHPWR cable. High-end RTX 40-series and newer GPUs need the adapter that comes with the card.
With only three PCIe 8-pin connectors, the PSU may not have enough for adapters that want more 8-pin inputs. These adapters are often thick and stiff, and routing them can be a struggle in a small case with little room to bend them.
750W is not enough for RTX 4090 class cards. It is sized for upper-mid builds.
If you pair a flagship GPU with a power-hungry CPU, look at 850W or more.
It is not silent under load. Zero RPM only applies up to about 300W.
The fan spins while gaming, and a small 92mm fan can be noticeable under heavy load. If quiet operation is your top priority, a build that can use a large-fan ATX PSU has the advantage.
Be careful with the listed dimensions. As noted above, the data lists 125 x 99 x 175 mm, which does not match the SFX standard.
Confirm case fit using the manufacturer's specifications and the form factors your case supports. Listing details can be wrong, so it is also worth checking the images and title to make sure the product really is the SP750.
**Watch the price and warranty on marketplace listings.Check the retailer's page for the latest price. Whether you can use the 5-year warranty locally can depend on where you buy, so confirm that the unit comes through official distribution and who handles warranty claims.
FAQ
Q. Can I use it in an ATX case? A.
Yes, with an SFX-to-ATX bracket. In large cases the cables may not reach, though, and an ATX PSU is often easier to work with.
Q. Is it enough for an RTX 4070 Ti or RTX 4080? A.
It is within range, but the margin is thin. Check the GPU maker's recommended PSU rating together with your CPU's power draw.
It is not suited to RTX 4090 class cards.
Q. Can I connect a 12VHPWR GPU? A.
There is no native 12VHPWR cable, so you plug PCIe 8-pin cables into the adapter that comes with the GPU. Check that the adapter needs no more than the three 8-pin connectors this PSU has.
Q. Is the fan quiet? A.
The fan stays off up to 40% load (about 300W), so it is quiet at low load. Under heavy loads such as gaming the fan spins, and as a small 92mm fan it can be noticeable.
Q. Does it work on 100V power in Japan?
A. Yes. It accepts AC 100-240V input, so it works as is.
Product Disclosure (Amazon)
- Manufacturer: Lian-Li
- Seller: APOLO1969
- Fulfilled by: APOLO1969
- ASIN: B09HMCZ551
- Note: This article covers a manufacturer-made product based on Amazon listing details.
