Choosing pc power supplies & cables gets complicated when a full SFX power supply sits beside a small GPU connector converter. The useful first decision is not simply which item has the bigger wattage number or the lower price. It is whether the build needs a complete power unit, a named set of board and peripheral connectors, a modular layout, or a cable that changes one PCI Express connection into another. That distinction keeps a converter cable from being treated as a substitute for a power supply.
Quick take
Start by separating the role each item plays. The three power supplies are all SFX-form-factor entries, while the converter cable addresses a narrower connection task. Among the supplies, connector names, condition, and modular construction are more useful comparison points than treating wattage figures as a performance ranking. The two SilverStone units share the same listed price, while the EVGA sits slightly higher and the cable occupies a very different price position.
Listed price comparison
| Item | Listed price | Relative price |
|---|---|---|
| SilverStone SST-ST30SF | USD 65.00 | |
| Silver Stone SST-ST45SF | USD 65.00 | |
| EVGA SuperNOVA 450 GM | USD 70.00 | |
| PCI Express converter cable | USD 4.96 |
Decision matrix
- Need named 20 Pin, 20+4 Pin, 24 Pin, and 8 Pin 12V connections: choose the SilverStone SST-ST30SF.
- Want 80 Plus Bronze wording in the model name: the Silver Stone SST-ST45SF is the direct match.
- Planning around 24 Pin, 4+4 CPU, 6+2 Pin PCI Express, SATA, and 4 Pin Peripheral connectors: the EVGA SuperNOVA 450 GM lists that connection group.
- Need to convert a 6-pin PCI Express lead to an 8-pin connection: the PCI Express converter cable is the purpose-built item in this comparison.
Product notes
SilverStone SST-ST30SF SFX Form Factor 300W 80Plus Bronze Power Supply
The SilverStone SST-ST30SF suits a build plan that calls for one-fan cooling and a listed 300W maximum-power figure. It also carries 80Plus Bronze wording, making it easy to distinguish from the other SFX entries without assigning a performance ranking to its wattage. The concrete tradeoff is condition: this unit is marked open box. Make that designation part of the purchase decision, especially when condition preference matters as much as the named connector arrangement. Its black finish is another stated detail, while the one-fan cooling setup is the clearest configuration reason to place it on a shortlist.
Silver Stone SST-ST45SF 450W SFX 80 Plus Bronze Power Supply
At USD 65, the Silver Stone SST-ST45SF matches the listed price of the SilverStone SST-ST30SF. That direct tie is a reason to compare the exact model wording and condition rather than presume a price advantage for either one. The stated limitation is straightforward: the SST-ST45SF is used. For a shopper comfortable with that condition designation, it remains a full-power-supply candidate with a specific 450W SFX label in its title. Keep the choice centered on the used status and the stated model language, rather than on an implied difference that the listing does not establish.
EVGA SuperNOVA 450 GM 450W 80 Plus Gold SFX Fully Modular Power Supply. New
The EVGA SuperNOVA 450 GM is the one to weigh when fully modular construction is the key cable-layout criterion. Its named connectors provide a specific connection set to work from, including CPU, PCI Express, SATA, and peripheral connections. At USD 70, it holds the highest listed price in this group, sitting USD 5 above each of the other full power supplies. That price placement is the clear limitation for shoppers comparing the three units closely. A one-fan cooling listing and SFX form factor complete the stated configuration without requiring assumptions about the build around it.
6-pin to 8-pin PCI Express Power Converter Cable GPU Video Card PCIE PCI-E 18AWG
At USD 4.96, this PCI Express converter cable is the lowest-priced entry and serves a sharply focused job: connecting a 6-pin PCIe power cable to a video card that requires an 8-pin PCIe power connection. That direct conversion purpose is the concrete reason to choose it when the existing power setup already has the appropriate six-pin lead. Its limitation is scope. The cable handles the connection task named in its title; it does not fill the complete-power-supply role of the three SFX units. The listed 18 AWG wiring is a useful identifying detail for shoppers comparing cable descriptions.
Final recommendation by use case
Choose the SilverStone SST-ST30SF when an open-box SFX unit and its one-fan cooling arrangement fit the plan. Pick the Silver Stone SST-ST45SF when a used-condition 450W SFX power supply is the intended purchase. Select the EVGA SuperNOVA 450 GM for a new-condition SFX power supply with its stated fully modular design. Use the 6-pin to 8-pin PCI Express Power Converter Cable for the targeted GPU connection task, particularly when its listed 18 AWG cable wording matches the needed adapter role.
