Choosing pc power supplies & cables starts with one important split: do you need a complete unit to power an ATX build, or a converter for one existing graphics-card power connection? The least expensive item here solves a very narrow cable task, while the other three are full power supplies. Decide that first, then compare modular design, form factor, connector needs, and condition.
Quick take
The $125.04 listed-price spread reflects two different kinds of purchase, not a single like-for-like choice. The 6-pin to 8-pin PCI Express Power Converter Cable is for a defined connection change. For a complete build, the choice narrows to the open-box 650W Segotep, the fully modular Segotep ATX 3.0 model, or the MSI MPG A1000G. Start with your build's actual task rather than treating the converter cable as an alternative to a PSU.
Listed price comparison
| Item | 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 | |
| 6-pin to 8-pin PCI Express Power Converter Cable GPU Video Card PCIE PCI-E 18AWG | USD 4.96 |
The bars show relative listed-price placement only; they do not compare power-supply capability or cable function.
Decision matrix
- Open-box complete PSU: Choose the OPEN BOX 650W Power Supply when open-box condition is acceptable and you want the lowest listed price among the three complete PSUs.
- New complete PSU centered on cable routing: Choose the Segotep 850W ATX 3.0 Gaming Power Supply for a new ATX option with a full-modular layout.
- Complete PSU at the highest listed price: Choose the MPG A1000G when its stated 1000W rating and named connector selection fit the build brief.
- Cable-only task: Choose the 6-pin to 8-pin PCI Express Power Converter Cable when the job is a specific PCIe connection conversion rather than whole-system power.
Product notes
OPEN BOX 650W Power Supply 80 Plus Gold Non-Modular ATX Gaming PC Case PSU
Pick this Segotep unit for an ATX build that calls for a listed 650W rating and 80 Plus Gold efficiency without moving to the higher listed prices of the other complete PSUs. Its 20+4 Pin connector, 120mm fan, and black finish make for a straightforward set of stated specifications. The meaningful limitation is in the title and condition: this is an open-box, non-modular PSU. That makes it a less natural match when selecting only the cables needed for a carefully routed build is the main priority. It is best viewed as a complete-power option with a simpler fixed-cable approach.
Segotep 850W ATX 3.0 Gaming Power Supply PCIe 5.0 Full Modular 80 Plus Gold PSU
The Segotep 850W ATX 3.0 Gaming Power Supply is the focused choice for a build where full modularity, PCIe 5.0, and a native 12VHPWR cable are central requirements. Flat black cables and the stated silent fan mode directly address pc cable management considerations, while the 24 Pin connection and 80 Plus Gold certification establish its role as a complete PSU. Its listed price is higher than the open-box 650W Segotep, so the modular cable arrangement needs to matter to your purchase. Choose it for the stated modern power-standard and cable-layout combination, not merely as an upgrade in price.
MPG A1000G PCIE 5.0 & ATX 3.0 Gaming Power Supply - Full Modular - 80 Plus Gold
Choose the MPG A1000G for its listed 1000W capacity, full-modular design, and explicitly named connector set: 4+4 CPU, 6+2 Pin PCI Express, 24 Pin, SATA I, and 4 Pin Peripheral. PCIe 5.0 and ATX 3.0 also appear in the model name, while the description specifies Japanese 105°C capacitors. The trade-off is form factor: this is an ATX PSU, so it is not the pick for an SFX-form-factor build. It also occupies the highest listed-price position in this comparison. That makes the MSI a targeted choice for a build brief that specifically calls for its stated capacity and connection mix.
6-pin to 8-pin PCI Express Power Converter Cable GPU Video Card PCIE PCI-E 18AWG
Reach for the 6-pin to 8-pin PCI Express Power Converter Cable when the specific task is connecting an existing 6-pin PCI Express power cable to a graphics card requiring an 8-pin PCI Express connection. The connector ends are stated plainly in the title and attributes, and the 18AWG wording provides a concrete cable specification. Its limitation is equally clear: this is a 6-pin-to-8-pin converter cable, not a complete ATX power supply for a PC build. The low listed price belongs to that narrow role, so it makes sense only when the rest of the system power arrangement is already in place.
Final recommendation by use case
Choose the OPEN BOX 650W Power Supply for a 650W, 80 Plus Gold ATX build where open-box condition is acceptable. Choose the Segotep 850W ATX 3.0 Gaming Power Supply when a full-modular layout and native 12VHPWR cable are the deciding factors. Choose the MPG A1000G when the stated 1000W rating and named connector selection match the build. Choose the 6-pin to 8-pin PCI Express Power Converter Cable only for the exact 6-pin-to-8-pin graphics-card connection task.
