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ASRock B450M/AC R2.0 AM4 AMD Promontory B450 SATA 6Gb/s Micro ATX AMD Motherboard
ASRock

ASRock B450M/AC R2.0 AM4 AMD Promontory B450 SATA 6Gb/s Micro ATX AMD Motherboard

Bottom line: The ASRock B450M/AC R2.0 AM4 AMD Promontory B450 SATA 6Gb/s Micro ATX AMD: Runs Ryzen 2000 through 5000 and 5000G on one AM4 socket; main trade-off: PCIe 3.0 x16 only - no PCIe 4.0 for Gen4 GPUs or SSDs.

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By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For retro PC hardware and period-correct parts, synthesises manufacturer documentation, community compatibility lists and marketplace listings rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

Pros & Cons

Pros

  • ✓ Runs Ryzen 2000 through 5000 and 5000G on one AM4 socket
  • ✓ DDR4-3200 support without stepping up to X570
  • ✓ Micro ATX fits SFF and budget mini-tower builds
  • ✓ Dual x16 slots with AMD Quad CrossFireX support
  • ✓ HDMI output covers Ryzen G-Series APU builds with no GPU

Cons

  • ✗ PCIe 3.0 x16 only - no PCIe 4.0 for Gen4 GPUs or SSDs
  • ✗ Second x16 slot is PCIe 2.0, so it runs at reduced bandwidth
  • ✗ B450 chipset means limited CPU overclocking headroom vs X470
  • ✗ Micro ATX layout leaves only four expansion slots total

Manufacturer description

ASRock B450M/AC R2.0 AM4 AMD Promontory B450 SATA 6Gb/s Micro ATX AMD Motherboard

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SpecPicks Verdict

SpecPicks scored ASRock B450M/AC R2.0 AM4 AMD Promontory B450 SATA 6Gb/s Micro ATX… using a rating × review-volume × price-fit model applied to published specs and reviews across the retro motherboards category. ASRock's retro motherboards 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 retro motherboards 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

  • Supports AMD AM4 Socket Ryzen 2000, 3000, 4000 G-Series, 5000 and 5000 G-Series Desktop Processors
  • Supports DDR4 3200*
  • 1 PCIe 3.0 x16, 1 PCIe 2.0 x16
  • AMD Quad CrossFireX
  • Graphics Output: HDMI*

Full Specifications

BrandASRock
Weight4000 g
USB 2.02
PlatformWindows 10
CPU SocketSocket AM4
Model NameB450M/AC R2.0
Chipset TypeAMD B450
Model NumberB450M/AC R2.0
Graphics OutputHDMI*
Mfr Part NumberB450M/AC R2.0
Number of Ports2
Total Usb Ports2
Processor SocketSocket AM4
Total PCIe Ports2
Total SATA Ports4
Compatible DevicesPersonal Computer
Memory Clock Speed2133 MHz
Warranty Description1 year
Compatible ProcessorsAMD A Series
RAM Memory TechnologyDDR4

Ready to buy?

ASRock B450M/AC R2.0 AM4 AMD Promontory B450 SATA 6Gb/s Micro ATX AMD Motherboard is vintage hardware; the used and vintage market on eBay carries most of the live inventory. Prices and condition vary by seller and move in real time, so we link the live listing rather than quote a cached price. It also has an Amazon listing — check it for current price and availability. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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ASRock B450M/AC R2.0 AM4 AMD Promontory B450 SATA 6Gb/s Micro ATX AMD Motherboard
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