Choosing pc power supplies & cables gets complicated when an open-box ATX unit sits beside new modular choices and an SFX-format model. The useful shortcut is to decide whether cable layout, form-factor wording, or ATX 3.0 and PCIe 5.0 labeling matters most before treating the wattage printed in a title as the deciding factor.
Quick take
All four carry 80 Plus Gold wording and list one fan, so those shared points do not settle the choice. Listed prices run from USD 52.99 to USD 130.00, a USD 77.01 spread. The meaningful split is the open-box condition of the Segotep GN-650, the modular cable arrangements of the other entries, and the distinct ATX and SFX format labels.
Listed price comparison
| Model | Listed price | Price bar |
|---|---|---|
| Segotep GN-650, open box | USD 52.99 | |
| Segotep 850W | USD 99.99 | |
| MSI MPG A1000G | USD 130.00 | |
| EVGA SuperNOVA 450 GM | USD 70.00 |
The EVGA sits USD 17.01 above the open-box Segotep, while the MSI is USD 30.01 above the Segotep 850W. Those gaps matter most when the named format or cable setup does not already make the decision for you.
Decision matrix
- Open-box versus new condition: The Segotep GN-650 is the only open-box choice. The Segotep 850W, MSI MPG A1000G, and EVGA SuperNOVA 450 GM are listed as new.
- Cable arrangement: The GN-650 is non-modular. The Segotep 850W and MSI MPG A1000G are fully modular, while the EVGA is described as fully modular and lists modular as a feature.
- Format wording: The GN-650 and MSI MPG A1000G list ATX form factor. The EVGA SuperNOVA 450 GM lists SFX form factor. The Segotep 850W title specifically highlights ATX 3.0.
- Graphics-cable terminology: The Segotep 850W includes a native 12VHPWR cable and is labeled PCIe 5.0. The MSI MPG A1000G title also carries PCIe 5.0 wording.
Product notes
Segotep GN-650 Open Box
The GN-650 makes sense when the listed 80 Plus Gold rating, 20+4 Pin connector, and 120mm fan suit the planned build. It is the lowest-priced entry in the comparison, but the important qualifier is its open-box condition. That condition is the clear limitation for shoppers who want a new unit, and its non-modular design differs from the modular cable layouts elsewhere in this group. Choose it for a straightforward 650W option when those two trade-offs fit your priorities, rather than expecting the cable flexibility highlighted by the modular alternatives.
Segotep 850W ATX 3.0
This is the most direct match for a shopper seeking the title's ATX 3.0 and PCIe 5.0 language together with a native 12VHPWR cable. Its full-modular setup uses flat black cables, and it lists efficiency up to 90%, giving it a distinctly cable-management-focused profile. The limitation is its USD 99.99 listed price, which places it USD 47.00 above the open-box GN-650. Pick this Segotep when the newer-spec terminology and native cable matter more to your shortlist than starting at the lowest listed price.
MSI MPG A1000G
The MSI MPG A1000G is the choice for shoppers whose use case begins with the 1000W rating in its title and a fully modular ATX power supply. Its connector list includes 4+4 CPU, 4 Pin Peripheral, 6+2 Pin PCI Express, 24 Pin, and SATA I connections. It also names 100% Japanese 105°C capacitors. The trade-off is simple: at USD 130.00, it has the highest listed price here. Select it when its stated 1000W configuration and named connector set are the deciding details, not merely because its wattage number is higher.
EVGA SuperNOVA 450 GM
The EVGA SuperNOVA 450 GM is the dedicated SFX-form-factor route in this comparison. It is fully modular and its listed connector set includes 24 Pin, 4+4 CPU, 6+2 Pin PCI Express, SATA, and 4 Pin Peripheral connections. ECO Mode with a DBB fan is another named feature that distinguishes its presentation. Its key boundary is the SFX designation, which is different from the ATX form factor identified for the GN-650 and MPG A1000G. Choose the EVGA when SFX is the format you are shopping for; otherwise, the ATX-labeled choices provide a more direct match.
Final recommendation by use case
- Lowest listed price with a 650W ATX option: Choose the Segotep GN-650 if an open-box purchase and non-modular layout are acceptable.
- ATX 3.0, PCIe 5.0, and a native 12VHPWR cable: Choose the Segotep 850W.
- A 1000W title and named capacitor specification: Choose the MSI MPG A1000G.
- An SFX-format build: Choose the EVGA SuperNOVA 450 GM.
