Is the Ryzen 5 8400F good for gaming?
It is adequate rather than strong. It ranks 94 of 201, which is fine with a mid-range card at 1080p, but it will hold back anything substantially faster. Check the pairing before a large graphics upgrade.
What GPU should I pair with a Ryzen 5 8400F?
The closest match at 1080p is the GeForce RTX 3090, wasting only 0.1% of the combined potential at around 127 fps. Anything materially faster will sit partly idle at this resolution, though it can still be the right buy if you plan to move to 1440p or 4K.
What a Ryzen 5 8400F is good for
This chip is capable at 1080p with a mid-range card, but it will become the limit if you pair it with something substantially faster. If you are considering a large graphics upgrade, check the pairing first — you may find most of the new card sitting idle.
Moving to a higher resolution is the cheapest way to get more out of it, because it shifts work onto the card and away from the chip.
A small cache holds this chip back
16 MB of L3 is modest by current standards, and it costs this chip more in games than its clock speed suggests. Game engines walk large, scattered data structures, so a small cache means more trips to main memory and more stalls on the render thread. Memory speed and timings matter unusually much on a part like this.
Where it sits
Ranked 94 of 201 desktop processors for gaming. Nearest faster: Core i5-14400F , Ryzen 7 5700X3D . Just below: Ryzen 7 5700X , Ryzen 7 5800 . Full method on the methodology page.