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MSI PRO B840M-B Motherboard, mATX - Supports AMD Ryzen 9000/8000 / 7000 Processors, AM5 - DDR5 Memory Boost (8000+ MT/s OC), PCIe 4.0 x16, M.2 Gen4, 2.5G LAN

MSI PRO B840M-B Motherboard

No price

Amazon.co.uk had no new offer for this board when we last checked (5 Nov 2026, 12:20 GMT). It may be out of stock or sold only by other sellers.

  • £99.07lowest we have recorded, 20 Aug 2026
  • £99.0790-day low
  • £100.71typical price, last 90 days
  • 410 dayswe have checked this price for

See it on Amazon

Amazon Warehouse offer

£65.56 Used - Like New

Sold by Amazon Resale · as of 5 Nov 2026, 12:20 GMT. On Amazon, look under “Other buying options” or “Save with Used”. About Warehouse boards

As an Amazon Associate we earn from qualifying purchases. The price on Amazon.co.uk when you buy is the one that applies.

Specification

ModelPRO B840M-B
BrandMSI
SocketAM5
ChipsetB840
Form factorMicro-ATX
MemoryDDR5
WiFiNo
First available on AmazonAug 2025 (1 yr 2 mo old)
Amazon ASINB0FLSLQQ7K
Amazon sales rank#280,326 (lower sells more)

Read from the Amazon listing title. Confirm the details and the CPU support list on the maker’s website before you buy.

Guides: AMD B840 chipset guide · AMD AM5 socket guide

Stated in the Amazon listing

RAM slots2
Fastest RAM speed stated8,000 MT/s
M.2 slots2
Newest PCIe generation statedPCIe 4.0
Wired LAN2.5GbE

Read automatically from the listing’s title and feature bullets. A feature that is missing here is simply not mentioned in the listing; the board may still have it.

From the Amazon listing

The seller’s own description, as shown on Amazon.co.uk. We have not checked these claims.

Price history

£80£100£120£140£118.19 from 7 Nov 2025£124.60 from 12 Dec 2025£133.13 from 23 Dec 2025£130.77 from 27 Dec 2025£101.14 from 2 Aug 2026£100.95 from 6 Aug 2026£100.93 from 8 Aug 2026£101.14 from 9 Aug 2026£100.71 from 16 Aug 2026£99.25 from 19 Aug 2026£99.07 from 20 Aug 2026£101.14 from 27 Aug 2026£99.09 from 28 Aug 2026£100.36 from 28 Aug 2026£101.14 from 29 Aug 2026£100.30 from 30 Aug 2026£101.14 from 31 Aug 2026£100.30 from 1 Sep 2026£101.14 from 1 Sep 20267 Nov 2025May 20265 Nov 2026
  • £99.07lowest we have seen
  • £133.13highest
  • £100.71usual price, last 90 days
  • 7 Nov 2025tracked since
Price changes as a table
FromNew price
2 Sep 2026, 15:20no offer
1 Sep 2026, 23:52£101.14
1 Sep 2026, 07:09£100.30
31 Aug 2026, 21:57£101.14
30 Aug 2026, 16:19£100.30
29 Aug 2026, 21:57£101.14
28 Aug 2026, 18:25£100.36
28 Aug 2026, 00:02£99.09
27 Aug 2026, 05:39£101.14
20 Aug 2026, 17:05£99.07
19 Aug 2026, 14:57£99.25
18 Aug 2026, 17:25no offer
16 Aug 2026, 17:07£100.71
9 Aug 2026, 17:17£101.14
8 Aug 2026, 13:36£100.93
6 Aug 2026, 06:22£100.95
2 Aug 2026, 08:20£101.14
2 Jan 2026, 13:08no offer
27 Dec 2025, 17:20£130.77
23 Dec 2025, 09:24£133.13
12 Dec 2025, 09:26£124.60
13 Nov 2025, 11:52no offer
7 Nov 2025, 08:10£118.19

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