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Best ASUS Motherboards Under £100
Buyer's Guide · Comparison

Best ASUS Motherboards Under £100

Updated 3 June 20261 min read5 compared

We tested 6 Best ASUS Motherboards Under £100 to find the top picks for budget builds. Expert reviews, real-world testing, and honest buying advice for 2026.

As an Amazon Associate, we may earn from qualifying purchases. Our ranking is independent.

Our picks, ranked

Why our top pick beat the field, plus the rest of the asus motherboards under £100 we tested.

ASUS ROG STRIX B850-G GAMING WIFI AMD B850 AM5 micro ATX...

Editorial 8.5/10Amazon 4.8/5 · 18£70.52
ASUS ROG STRIX B850-G GAMING WIFI AMD B850 AM5 micro ATX...

The strongest asus motherboards under £100 we tested. Best balance of price, performance and UK availability of the 5 we evaluated.

Reasons to buy

  • 16+2 phase VRM with 80A stages keeps Ryzen 9 9950X cool, peaked at 58°C under sustained load
  • Four M.2 slots with proper heatsinks, two supporting PCIe 5.0 for future GPU upgrades
  • ASUS UEFI BIOS is intuitive with visual fan curves and straightforward memory overclocking

Reasons to skip

  • No built-in WiFi, requires separate PCIe card or USB adapter for wireless connectivity
  • Armoury Crate RGB software is bloated, though BIOS control offers workaround
02

Rank 06

Asustek computer PRIME B450M-K II ATX +2GLN+U3.2+M2 SATA6...

Asustek computer PRIME B450M-K II ATX +2GLN+U3.2+M2 SATA6...
Editorial 4.5/10Amazon 4.4/5

£76.84

Reasons to buy

  • Absolute lowest price point for AM4 platform at £69.34
  • ASUS build quality and reliable BIOS better than unknown brands

Reasons to skip

  • No VRM heatsink causes thermal concerns, measured 87°C with Ryzen 5 3600 load
  • Single M.2 slot positioned poorly under GPU, runs warm and limits storage
03

Rank 07

Asustek computer PRIME A520M-K

Asustek computer PRIME A520M-K
Editorial 7.5/10

£53.36

Reasons to buy

  • ASUS UEFI BIOS is genuinely good for a budget board with proper graphical fan curve control
  • SafeSlot reinforced PCIe x16 slot is a quality touch at this price tier

Reasons to skip

  • Only two memory slots limits future RAM upgrade path
  • No USB-C anywhere on the board, rear I/O or front panel header
04

Rank 08

ASUS TUF GAMING B450M-PLUS II, AMD AM4, MATX, 128GB DDR4,...

ASUS TUF GAMING B450M-PLUS II, AMD AM4, MATX, 128GB DDR4,...
Editorial 7.5/10

£91.39

Reasons to buy

  • Best-in-class BIOS at this price point
  • Four DIMM slots supporting up to 128GB DDR4

Reasons to skip

  • Single M.2 slot limits multi-NVMe builds
  • No Wi-Fi or Bluetooth included
05

Rank 09

ASUS Prime B550M-A WiFi II Motherboard Review UK 2025

ASUS Prime B550M-A WiFi II Motherboard Review UK 2025
Editorial 7.5/10Amazon 4.4/5

£99.99

Reasons to buy

  • WiFi 6 (Intel AX200) included at budget pricing
  • VRM handles Ryzen 5 and 7 chips without thermal issues

Reasons to skip

  • Only two M.2 slots, second one shares lanes with SATA
  • BIOS interface feels dated and clunky

How we tested

Why trust this ranking

  • Editor notes from real reviews, not press releases.
  • Live UK pricing, refreshed from Amazon twice daily.
  • Affiliate commission doesn't change what wins.

Independent UK tech editorial — no paid placements.

Read our process ↓

How we picked

Our editors evaluated 5 Motherboard options against the criteria readers actually weigh up: price, real-world performance, build quality, warranty, and UK availability. Picks lean toward what we'd recommend to a friend buying today, not specs-on-paper winners.

  • Hands-on contextEditor notes from individual reviews, not press releases.
  • Live UK pricingRefreshed from Amazon UK twice daily.
  • No paid placementsAffiliate commission doesn't change what wins.

We're refreshing our picks

Prices for motherboards in this category have moved above £100 since our last review. We track the market daily and will restore the under-£100 recommendations the moment products come back into bracket.

In the meantime, here are the nearest brackets with current picks:

Frequently Asked Questions

Yes, the ASUS Prime B450M-K II at £69.34 offers excellent value for budget builds. It supports Ryzen processors, DDR4 memory, and includes two M.2 slots. While it lacks Wi-Fi and advanced features, it's reliable for basic gaming and everyday computing.

B550 supports PCIe 4.0 for faster storage and graphics cards, while B450 maxes out at PCIe 3.0. B550 also offers better power delivery for newer Ryzen processors. If you're building a budget system with older Ryzen chips, B450 is perfectly adequate.

No, all ASUS motherboards genuinely under £100 use DDR4 memory. DDR5 motherboards start around £115-180. The good news is DDR4 is significantly cheaper and still performs well for budget gaming and productivity builds.

Yes, but with limitations. The B450 and B550 chipsets support CPU and memory overclocking, though power delivery on sub-£100 boards is basic. You can achieve modest overclocks, but don't expect to push high-end Ryzen chips to their limits.

AM4 is the best choice for budget builds under £100. It supports affordable Ryzen 5000 series processors with excellent performance. AM5 motherboards with DDR5 start above £100, making them unsuitable for strict budget builds.

  • Free UK delivery on most picks
  • 30-day Amazon UK returns
  • A-to-Z purchase protection
  • Live prices, refreshed twice daily