Choosing pc power supplies & cables gets difficult when two PSUs share 80 Plus Gold efficiency yet approach configuration differently. The useful payoff is deciding whether the lower listed price covers your build requirements, or whether the other PSU's named connections and format justify the extra outlay. Because neither route is automatically better for every PC, a connector-led comparison is more useful than a headline-only choice.
Quick verdict
Choose the Open Box 650W Power Supply 80 Plus Gold Non-Modular ATX Gaming PC Case PSU when USD 52.99 is the deciding factor. The Segotep 850W ATX 3.0 Gaming Power Supply PCIe 5.0 Full Modular 80 Plus Gold PSU is USD 99.99, creating a USD 47 price spread, and is the better-directed pick when new condition is important to the purchase.
Listed comparison
| Detail | Open Box 650W Power Supply | Segotep ATX 3.0 Gaming Power Supply |
|---|---|---|
| Listed price | USD 52.99 | USD 99.99 |
| Condition | Open box | New |
| Format | ATX, non-modular | ATX 3.0, full modular with flat black cables |
| PCIe connection named | 6+2 Pin connectors | Native 12VHPWR cable for PCIe 5.0 graphics cards |
| Efficiency | 80 Plus Gold | 80 Plus Gold |
Where each product wins
- Open Box 650W Power Supply: This is the direct match when the single 12V output and PFC Protection are the features you want to prioritize. Its description also calls out a 20+4 Pin main connection, making it a focused choice for a build planned around those connection details.
- Segotep ATX 3.0 Gaming Power Supply: Pick this model where Comprehensive Protection is a feature you specifically want in the configuration. That is a concrete distinction attached to this PSU rather than a general claim that one format suits every gaming PC.
Product notes
Open Box 650W Power Supply
Choose the Open Box 650W Power Supply for an ATX gaming PC case setup when its single 12V output and PFC Protection are the stated priorities. A 20+4 Pin main connection and 120mm fan further define the configuration. This makes sense for a shopper who can map those details to an intended system rather than choosing solely by a number in the title. Its clear limitation in this pairing is the non-modular design. That makes cable-layout preference central to the decision, especially for someone comparing it with a PSU built around a different cable arrangement.
Segotep ATX 3.0 Gaming Power Supply
Segotep ATX 3.0 Gaming Power Supply makes sense when Comprehensive Protection is an expressly desired feature. That named feature is the direct reason to select it in this matchup, without assuming it matters equally for every build. The 24 Pin connector and one-fan cooling description add configuration detail, while the black color matches the other PSU. The limitation is full modularity itself: it defines the cable arrangement rather than answering every buyer's needs. Pick it for a build that intentionally calls for that arrangement instead of treating it as a universal upgrade.
Final choice by use case
Choose the 650W model where its named 6+2 Pin connectors are part of your intended cable plan. Choose the Segotep ATX 3.0 Gaming Power Supply when ATX 3.0 and PCIe 5.0 readiness, along with the native 12VHPWR cable, are specific build requirements. This is a use-case split rather than a general-purpose winner.
