AMD FX-Series FX-4100 4-core Socket AM3+

The FX-4100 is a budget quad-core that punches above its weight in DX11 gaming and overclocking. Just don't pay more than lunch money for it.

The single-thread score of 2531 puts this chip in the 71st percentile, which honestly surprised us. That's not terrible for a 32nm part from over a decade ago. Multi-thread lands at 62nd percentile, so it's about average for its class. The 3.8GHz boost clock helps in bursty workloads, and the unlocked multiplier means you can push it further if you've got decent cooling. But don't expect miracles in synthetic benchmarks, this chip gets smoked by modern budget CPUs. Real-world DX11 gaming is where it shines, especially paired with older Radeon cards.

Against the Intel Core 2 Duo E8500, the FX-4100 wins on core count and multi-threaded workloads, but the E8500 actually has better single-thread performance in some tests. The AMD A10-5800K is the more interesting comparison, it's got integrated graphics and similar architecture, but the FX-4100's dedicated CPU focus gives it an edge in raw compute. The Dell Xeon E5-2637 V2 is in a different league entirely, but it's also a server chip that won't fit in your AM3+ board. For pure budget desktop use, the FX-4100 holds its own against these older competitors.

Here's the thing: prices are all over the place. We're seeing listings from USD 23 to USD 390, which is frankly absurd for this chip. The sweet spot is clearly the low end. At USD 23 from the US listings, this is a steal for a budget build or a cheap upgrade to keep an old AM3+ system alive. At USD 390, you're getting robbed. Buy the cheapest one you can find and don't look back.

The AMD FX-4100 is a budget quad-core from 2011 that still has a pulse if you know what you're getting into. It's not going to win any benchmark shootouts, but for the right price and the right use case, it's a surprisingly capable little chip. The one thing to know: this is a value play for budget builds and retro gaming rigs, not a modern productivity workhorse.

If you're building a modern system for productivity, content creation, or current-gen gaming, this isn't it. Go grab a used Ryzen 3 or even a newer Intel i3 instead. The FX-4100 is for budget tinkerers and retro enthusiasts only.

If you need a cheap quad-core to breathe life into an old AM3+ system or build a budget retro gaming rig, the FX-4100 is a solid pick at the right price. Just don't pay more than USD 30-40 for it, and be careful with those pins. It's not a modern performer, but it's honest about what it is.