AMD Athlon X4 940 socket: AM4

What the Athlon X4 940 is

The Athlon X4 940 pairs four Excavator cores in two modules without multithreading for basic AM4 desktops. It launched in July 2017 as a retail only SKU with a 3.2 GHz base and up to 3.6 GHz boost at 65 W. AMD positioned the X4 line as the cheapest AM4 path for towers that already include graphics.

Two megabytes of L2 cache with no L3 cover office documents and video playback. The 28 nm process and fixed platform keep behavior steady for managed images. Four threads handle background updates beside foreground work.

There is no integrated graphics on Athlon X4 parts, so a graphics card is required even for setup displays. The multiplier is unlocked per AMD marketing, while the database lists locked and reads as stale. DDR4-2400 in two channels suits cheap builds.

Socket and motherboard compatibility

The X4 940 fits AM4 on 300, 400 and 500 series boards with display outputs unused. Boards need a BIOS with Bristol Ridge IDs, which early AM4 releases carry. The Socket vs chipset: what decides whether a CPU works guide lists board support by series.

A cheap discrete card covers setup and office triples where the tower has no graphics. Single slot low profile cards suit small office towers. The AMD Athlon 200GE is a later AM4 Athlon with Vega graphics for card free builds.

Installation follows the usual AM4 routine. Lift the retention lever, line up the marked corner, let the chip settle by its own weight and close the lever.

Memory, PCIe and cooling

The memory controller supports DDR4-2400 in two channels. Two matched sticks give dual channel speed for office multitasking. ECC is listed as not supported, so standard desktop DIMMs are the fit.

PCI Express arrives as version 3.0 with 8 lanes from the APU for graphics and storage. A basic card and a SATA SSD fit the lane budget of a cheap tower. Cooling follows the 65 W envelope with stock or tower air on the AM4 pattern.

Upgrade paths

On the same socket the natural moves are Raven Ridge Athlons such as the AMD Athlon 200GE with Vega graphics, keeping board and DDR4. Those swaps add modern cores and drop the discrete card. Gamers on this chip upgrade the graphics card first.

Moving past AM4 to AM5 needs a new board and DDR5 memory. The X4 940 exists to keep old AM4 boards useful for basic towers.

Buying the X4 940 used

The X4 940 sells almost entirely on the used market, since retail Bristol stock cleared years ago. Used prices sit near the bottom of AM4 listings, which makes it a test chip for reviving old boards as much as a daily driver. Sellers often bundle it with A320 boards from office decommissioning.

Pair it with a GT 710 class card and a small SATA SSD for a browsing tower that costs little. The 65 W envelope and DDR4-2400 support keep the rest of the build cheap. Buyers should confirm the board BIOS posts Bristol before paying, since some late boards dropped early IDs.