The processor decision is usually made backwards. People compare core counts between chips that will never go in the same motherboard, when the first question is which platform you are buying into, because that decides your motherboard, your memory, and what you can upgrade to in three years.
In short
- Pick the platform first. The socket determines your motherboard and memory generation.
- More cores help work that can be split up. Games mostly cannot split beyond a handful.
- Six cores is a sensible floor for a new build; eight is comfortable.
- A matching socket does not guarantee the board will start the chip. Check the CPU support list.
Platform before product
A processor fits one socket. That socket determines which motherboards you can buy, which memory generation you need, and how long you can upgrade before replacing everything.
AM5 from AMD uses DDR5 and has a stated commitment to support future processor generations, which makes it the better bet if you expect to upgrade the processor alone later. LGA1700 from Intel offers boards using either DDR4 or DDR5, which is useful if you already own DDR4 memory, but it is a mature platform with limited upgrade path ahead of it.
AM4 is the previous AMD platform and still worth considering for a tight budget, because the boards, processors and DDR4 memory are all inexpensive. You are buying into a finished platform, but a finished platform at a low price is a legitimate choice.
Cores, and when they stop helping
A core is an independent execution unit. Two cores can genuinely do two things at once. This helps enormously for work that divides into independent pieces: video encoding, compiling, rendering, running virtual machines.
Games divide much less well. A game has to keep everything consistent frame by frame, so much of its work happens in sequence. Most games use a few cores heavily and spread light work across the rest. This is why an eight-core processor rarely beats a six-core one with faster cores in gaming, and why a sixteen-core chip is not twice as good for games as an eight-core one.
Practically: six cores is the sensible floor for a new build, eight is comfortable for gaming with things running alongside, and beyond that you are buying for specific productivity workloads rather than general use.
Clock speed is not comparable across designs
Clock speed counts cycles per second. It tells you how fast one particular design runs, and it is meaningless across different designs, because how much work a core does per cycle varies between architectures and between generations.
A newer chip at 4.5 GHz routinely outperforms an older one at 5.0 GHz. Compare within a generation, and use measured benchmarks from publications that actually run them when comparing across generations.
Cache, and why it matters for games
Cache is a small amount of extremely fast memory on the processor itself. When the data a core needs is in cache, it gets it almost immediately; when it is not, the core waits for system memory, which is far slower.
Games move through large amounts of data unpredictably, which makes them unusually sensitive to this. It is why AMD processors with stacked cache perform notably better in many games than their core counts and clock speeds suggest. For gaming specifically, a large cache is often worth more than extra cores.
Integrated graphics
Some processors include a graphics processor, some do not. AMD chips ending in F, and Intel chips ending in F, generally do not.
Without integrated graphics and without a card, a machine starts and displays nothing. This is worth checking deliberately: it is a common and confusing first-build failure, and the PC Builder flags it.
Integrated graphics are also useful as a fallback for diagnosing a suspected card fault, and they are genuinely sufficient for desktop work and video.
A matching socket means the chip physically fits. It does not guarantee the board will start it. Boards sold before a processor launched often need a firmware update first, and applying that update may require a processor the board already supports. Check the CPU support list for your exact board model, and check whether it offers BIOS flashback, which allows updating without a working processor installed.
Related: How to choose a motherboard and What CPU bottlenecking actually means.