Choosing pc power supplies & cables gets complicated when a compact case, a newer ATX 3.0 build, and cable-routing preferences all point in different directions. The useful shortcut is to settle form factor first, then decide whether a fixed-cable or modular layout fits your build plan. Listed output and connector details can then narrow the field without treating a larger number as automatically better.
Quick take
These four choices divide into an SFX-format unit, a non-modular ATX unit, and two modular ATX models. The SilverStone is the clear form-factor-specific choice because its title identifies it as SFX. The Segotep 650W is the straightforward lower-priced ATX route, while the 850W Segotep brings ATX 3.0 and PCIe 5.0 language into the decision. MSI's MPG A1000G stands apart with its detailed connector list and 1000W description.
Listed price comparison
| Power supply | Listed price | Price position |
|---|---|---|
| OPEN BOX 650W Power Supply 80 Plus Gold Non-Modular ATX Gaming PC Case PSU | USD 52.99 | |
| Segotep 850W ATX 3.0 Gaming Power Supply PCIe 5.0 Full Modular 80 Plus Gold PSU | USD 99.99 | |
| MPG A1000G PCIE 5.0 & ATX 3.0 Gaming Power Supply - Full Modular - 80 Plus Gold | USD 130.00 | |
| SilverStone SST-ST30SF SFX Form Factor 300W 80Plus Bronze Power Supply | USD 65.00 |
The open-box 650W Segotep carries the lowest listed price. The MSI MPG A1000G is the highest-priced selection in this group, so its specific 1000W description and connector mix should be central to the choice rather than an afterthought.
Decision matrix
- Start with the SilverStone SST-ST30SF when the build calls for an SFX form factor. That designation is more decisive than comparing it directly with the ATX units.
- Pick the open-box Segotep 650W for a fixed-cable ATX approach at the lowest listed price of USD 52.99.
- Choose the Segotep 850W when full modular cabling with flat black cables is the priority; its title also names ATX 3.0 and PCIe 5.0.
- Lean toward the MPG A1000G when the named connector selection matters to your component plan: 4+4 CPU, 6+2 PCI Express, SATA I, peripheral, and 24-pin connections are all listed.
Product notes
OPEN BOX 650W Power Supply 80 Plus Gold Non-Modular ATX Gaming PC Case PSU
This Segotep option makes sense for a conventional ATX build centered on its listed 650W output. It pairs 80 Plus Gold labeling with a 120 mm fan and a 20+4-pin connector, giving it a familiar full-size PC power configuration. The open-box condition is part of its appeal for shoppers who are comfortable choosing that condition, and the black finish keeps the presentation understated. Its key limitation is explicit in the title: it is non-modular. That is a less flexible fit for a build plan focused on selecting and routing only the cables you intend to use.
Segotep 850W ATX 3.0 Gaming Power Supply PCIe 5.0 Full Modular 80 Plus Gold PSU
The Segotep 850W is directed at builders who specifically want ATX 3.0 and PCIe 5.0 named in the power supply title. Its description also includes a native 12VHPWR cable, and the listed output is 850W. Those details give it a focused role in a build planned around the named standards, rather than a generic ATX replacement. It is listed as new, with a 120 mm fan and 24-pin connector. The limitation is the USD 99.99 price: it asks more than the lower-priced entries, so the ATX 3.0, PCIe 5.0, and 12VHPWR details should be relevant to your plan.
MPG A1000G PCIE 5.0 & ATX 3.0 Gaming Power Supply - Full Modular - 80 Plus Gold
MSI's MPG A1000G is the model to focus on when the stated 1000W output is central to your component plan. Beyond the ATX 3.0 and PCIE 5.0 wording, it describes 100% Japanese 105°C capacitors and a fully modular design. The broad connector listing is especially useful for shoppers who want those connector types spelled out rather than implied. This is a new ATX unit with one fan listed. Its tradeoff is straightforward: at USD 130.00, it has the highest listed price here. Choose it for the named output, modular design, and connectors-not merely because it sits at the top of the price range.
SilverStone SST-ST30SF SFX Form Factor 300W 80Plus Bronze Power Supply
The SilverStone SST-ST30SF is the natural starting point when SFX form factor is the requirement. Its connector list includes 20-pin, 20+4-pin, 24-pin, and 8-pin 12V connections, while the stated configuration uses one fan and an open-box condition. Those particulars make it a distinct option from the ATX selections without relying on output figures alone. The limitation is its 80Plus Bronze label, whereas the three ATX alternatives carry 80 Plus Gold wording. It is best approached as the form-factor-led choice, with the listed 300W maximum considered alongside the needs of the planned system.
Final recommendation by use case
Choose the SilverStone SST-ST30SF for an SFX-oriented build, where its form factor and stated 300W maximum set the direction. Pick the open-box Segotep 650W for a conventional ATX setup built around its listed 650W output. The Segotep 850W is the targeted choice for a plan using ATX 3.0, PCIe 5.0, and the named 12VHPWR cable. Select the MSI MPG A1000G when its stated 1000W output and fully modular configuration are the details your build calls for.
