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The A6-6400K is an FM2-socket APU, and because FM2+ boards accept FM2 chips, both pure-FM2 and FM2+ boards are realistic fits. These eight are real, confirmed FM2/FM2+ boards spanning the A55, A75, and A88X chipset tiers — from bare-bones budget micro-ATX boards to fuller-featured options with more USB 3.0 and SATA connectivity.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | Gigabyte GA-F2A88XM-D3H | $45-$75 (used/NOS) | Amazon · eBay |
| 2 | ASUS A88XM-A | $60-$100 (used/NOS) | Amazon · eBay |
| 3 | MSI FM2-A75MA-E35 | $25-$45 (used/NOS) | Amazon · eBay |
| 4 | ASRock FM2A88X Extreme6+ | $70-$110 (used/NOS) | Amazon |
| 5 | ASUS F2A55-M LE | $20-$40 (used/NOS) | Amazon · eBay |
| 6 | MSI FM2-A55M-E33 | $20-$40 (used/NOS) | Amazon · eBay |
| 7 | ASRock FM2A55M-DGS | $20-$40 (used/NOS) | Amazon · eBay |
| 8 | Gigabyte GA-F2A55M-DS2 | $20-$40 (used/NOS) | Amazon · eBay |
The picks, in detail
Gigabyte GA-F2A88XM-D3H
An FM2+ micro-ATX board backward-compatible with the FM2 A6-6400K, built on the higher-end A88X chipset for more connectivity than the budget A55 boards.
- FM2+ socket, backward-compatible with FM2
- A88X chipset
- Two fan headers, more than most boards in its price class
- Best connectivity-per-dollar of the A88X boards here
- Widely available used given how commonly it sold
- Mixed owner reviews on long-term build quality
ASUS A88XM-A
An A88X-chipset FM2+ board from ASUS, priced above the Gigabyte and MSI A88X alternatives but generally regarded as the better-built option of the three.
- FM2+ socket, backward-compatible with FM2
- A88X chipset
- Micro-ATX form factor
- Regarded as better build quality than the cheaper A88X competitors
- Full A88X feature set (more SATA/USB 3.0 than A55 boards)
- Priciest of the A88X boards on this list
MSI FM2-A75MA-E35
A budget FM2-socket board on the A75 chipset, a direct match for the A6-6400K’s own FM2 socket without needing FM2+ backward compatibility.
- FM2 socket (direct match, not backward compatibility)
- A75 chipset
- Micro-ATX form factor
- One of the cheapest options that’s a native FM2 match rather than a compatible FM2+ board
- Simple, no-frills reliable board for a budget build
- Fewer features than the A88X-chipset boards
ASRock FM2A88X Extreme6+
ASRock’s higher-end FM2+ board on the A88X chipset, ATX-sized rather than micro-ATX for more expansion slots than the smaller boards here.
- FM2+ socket, backward-compatible with FM2
- A88X chipset
- Full ATX form factor with Quad CrossFireX support
- Most expansion slots of any board on this list
- Full-size ATX layout for easier cable routing
- Overkill in features/price for a budget A6-6400K build specifically
ASUS F2A55-M LE
A pure-FM2 budget board on the A55 chipset, the most basic and least expensive tier of board that still directly matches the A6-6400K’s socket.
- FM2 socket (direct match)
- A55 chipset
- HDMI output, micro-ATX form factor
- Very low cost even by budget FM2 board standards
- ASUS build quality at an entry-level price
- Fewest features of any board on this list (limited SATA/USB)
MSI FM2-A55M-E33
MSI’s entry-level A55-chipset FM2 board, directly comparable to the ASUS F2A55-M LE as a bare-bones budget pick.
- FM2 socket (direct match)
- A55 chipset
- Micro-ATX form factor
- Among the cheapest boards on this list
- Simple, low-frills board for a basic office or media PC build
- Basic connectivity, no USB 3.0 headers on some variants
ASRock FM2A55M-DGS
An FM2 A55-chipset board with AMD Dual Graphics support, a niche feature for pairing the A6-6400K’s integrated GPU with a compatible discrete card.
- FM2 socket (direct match)
- A55 chipset with Dual Graphics support
- D-Sub and DVI-D outputs
- Dual Graphics support is a genuine bonus for stretching the A6-6400K’s integrated GPU further
- Budget pricing similar to other A55 boards
- Dual Graphics benefit only matters if pairing with a specific compatible discrete GPU
Gigabyte GA-F2A55M-DS2
Gigabyte’s A55-chipset budget board, sold in both FM2 and later FM2+ revisions, rounding out the entry-level tier alongside the ASUS and MSI A55 boards.
- FM2 or FM2+ socket depending on revision
- A55 chipset
- Micro-ATX form factor
- Directly comparable budget pricing to the ASUS F2A55-M LE and MSI A55M-E33
- Widely available used
- Check the revision number — earlier revisions are FM2-only, not FM2+
Buying tips
- The A6-6400K is a socket FM2 chip; FM2+ boards accept it too, so both pure-FM2 (A55/A75 chipset) and FM2+ (A88X chipset) boards on this list are valid fits.
- These are all discontinued from major retail, so expect used or new-old-stock listings rather than current-production stock.
- The A88X-chipset boards (Gigabyte GA-F2A88XM-D3H, ASUS A88XM-A, ASRock FM2A88X Extreme6+) add more SATA/USB 3.0 ports than the A55 budget boards — worth the extra cost only if you actually need the extra ports.
As an Amazon Associate and eBay Partner, toptenpick.com earns from qualifying purchases. Prices and availability are subject to change.