ASRock
ASRock PRO-850B Power Supply
Bottom line: The ASRock PRO-850B Power Supply is a specs-and-price decision rather than a crowd-consensus one in the power supplies category. Check the specification table below against one or two close alternatives — on price and spec fit, not on star ratings.
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Pros & Cons
Pros
- ✓ Strong 12V Output: Delivers 70.8A on the +12V rail for stable CPU and GPU power delivery
- ✓ Backed by ASRock's warranty and support channels
Cons
- ✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
- ✗ Price, stock, shipping and returns are set by the retailer and may have changed since this page was last updated
Manufacturer description
The ASRock PRO-850B Power Supply delivers reliable 850W performance with 80 PLUS Bronze efficiency, making it an excellent choice for budget-conscious builders seeking modern features. Compliant with ATX 3.1 standards, this PSU handles power excursions up to 200% and includes a native PCIe 5.1 connector for next-generation graphics cards. The robust +12V rail provides 70.8A of continuous power, supporting mid-range to high-end system configurations with stability. Built with all-Taiwanese capacitors and comprehensive circuit protections, the PRO-850B ensures system safety while operating…
SpecPicks Verdict
SpecPicks scored ASRock PRO-850B Power Supply using a rating × review-volume × price-fit model applied to published specs and reviews across the power supplies category. ASRock's power supplies lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.
Common buyer scenarios for power supplies of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.
Key Features
- 850W Bronze Efficiency: 80 PLUS Bronze certified with reliable power delivery for mid-range to high-end system builds
- ATX 3.1 Compatible: Meets latest ATX 3.1 standards with 200% total power excursion capability for next-gen components
- PCIe 5.1 Ready: Includes native 12V-2x6 connector (12+4pin) for modern graphics cards alongside traditional PCIe connectors
- Strong 12V Output: Delivers 70.8A on the +12V rail for stable CPU and GPU power delivery
- Comprehensive Protections: Features OCP, OVP, UVP, OPP, OTP, and SCP for complete system safety
- Quiet 120mm Cooling: Balanced fan design maintains low noise levels during operation
Full Specifications
| Brand | ASRock |
|---|---|
| Wattage | 850 watts |
| Dimensions | 140x150x86mm |
| Model Name | PRO-850B |
| Form Factor | ATX |
| Model Number | 90-UXR085-BNUAA2 |
| Compatibility | PC |
| Connector Type | PCI Express, SATA |
| Cooling Method | Air |
| Output Wattage | 850 watts |
| PCIe 5.1 Ready | Includes native 12V-2x6 connector (12+4pin) for modern graphics cards alongside traditional PCIe connectors |
| Item Dimensions | 5.51 x 5.91 x 3.39 inches |
| Number of Items | 1 |
| Dedicated Support | Contact us via Amazon for product inquiries or assistance |
| Flat Cable Design | Enables clean cable management and optimal airflow |
| Strong 12V Output | Delivers 70.8A on the +12V rail for stable CPU and GPU power delivery |
| ATX 3.1 Compatible | Meets latest ATX 3.1 standards with 200% total power excursion capability for next-gen components |
| Compatibility Note | Standard ATX dimensions (140x150x86mm) fit most PC cases |
| Compatible Devices | Personal Computer |
| Quiet 120mm Cooling | Balanced fan design maintains low noise levels during operation |
| Full listing title | ASRock PRO-850B Power Supply - 850W 80 Plus Bronze Certified, ATX 3.1 Ready, PCIe 5.1 Compatible, 120mm Fan, Full Protection Circuit, 3-Year Warranty |
Ready to buy?
ASRock PRO-850B Power Supply - 850W 80 Plus Bronze Certified, ATX 3.1 Ready, PCIe 5.1 Compatible, 120mm Fan, Full Protection Circuit, 3-Year Warranty is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
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