What makes a processor great? Some say it's how expensive it is, while others suggest it's the number of cores or its overclockability that determines the quality of a CPU. In reality, it's a matter of personal preference backed by some hard numbers.
You would likely be disappointed if you shelled out a small fortune just to build a machine that only ends up being used for typing up documents. Likewise, thinking you could save some money by skimping out on the CPU in your gaming rig would be an equally misguided decision.
The goal is to achieve the best performance possible on a set budget. If money were no object, we would all be funding labs-on-a-chip like IBM. There are plenty of options from the only two remaining x86 chipmakers, AMD and Intel, focused on everything from word processing to gaming.
Realistically, though, until AMD releases chips that will use the new Zen-based architecture and a 14nm manufacturing process, Intel has the upper hand both in performance and value for money.
Moreover, you'll need to take into consideration the rest of your PC's components. Pairing a top-end GTX 1080 graphics card with a cheap processor simply wouldn't make sense. Whether you're building a budget PC or a premium-priced server machine, you'll want to keep your parts consistent.
Overclocking, too, is worth your consideration. It's completely understandable if you're apathetic towards the idea of pushing your chip beyond its manufacturer-enforced clock speeds. However, if that's something you think you might be interested in down the line, it's never too early to start looking into overclock-friendly components.
With this list, we're focused purely on readily available desktop and server processors; laptop CPUs, obsolete sockets and non-x86 parts are not covered. Without further ado, here are our picks for the top 10 best processors you can find right now for your desktop PC.
1. AMD A8-7670K
Processor Cores: 4 | Thermal Design Power: 95W | Graphics Controller: Radeon R7 Series | Clock Speed: 3.6GHz | Processor Socket: FM2+ | L2 Cache: 4MB
If you are an AMD enthusiast (or like rooting for the underdog), these are interesting times. AMD is about to launch a series of processors based on a new architecture (Zen) which will obliterate the current generation of CPUs. So prices are falling accordingly. The A8-7670K remains one of the rare bright spots in AMD's lineup despite being more than two years old.
It is built on a newer 28nm manufacturing process which kind-of explains why it has a 95W TDP – thermal design power, or a part's share of your power supply's available Watts – despite a relatively high base and turbo clock speed (3.6GHz and 3.9GHz). Its graphics performance is where it shines thanks to an onboard GPU that is slightly more powerful than the Radeon R7 240 GPU (six compute units, 384 shader cores, 757MHz GPU clock speed).
Read the full review: AMD A8-7670K
2. Intel Xeon E5-2670
Best for experienced power seekers
Processor cores: 8 | Thermal Design Power: 115W | Graphics Controller: None | Clockspeed: 2.6GHz | Processor socket: FCLGA1011 | Cache: 20MB
Intel Xeon E5-2670
One of the best kept secrets in the world of computer hardware is that, every now and then, data centers around the world, operated by some of the biggest tech companies in the world, dump hundreds, if not thousands of processors as they migrate to newer, faster and more power efficient models.
When that happens, they usually end up on eBay or on Amazon, where you can buy them for a fraction of their price (usually one tenth). The Sandy-Bridge E5-2670 v1 is one of them; it's second-hand price is one-tenth of its retail price. Grab a pair of them to construct a workstation rig that would put Intel's current finest CPU to shame with a total of 16 cores, 32 threads and 40MB cache.
3. Intel Core i3-6100
Heavy lifting on the cheap
Processor Cores: 2 | Thermal Design Power: 65W | Graphics Controller: Intel HD Graphics 530 | Clock Speed: 3.7GHz | Processor Socket: LGA 1151 | L2 Cache: 2 x 256KB
Intel Core i3-6100
If you want to do some heavy lifting but don't want to blow your savings on a piece of silicon, then check out this chip. The Intel Core i3-6100 is the cheapest Core processor based on the new Skylake architecture, and you don't have to fork out a fortune for it.
True, you'll want to pair it with a motherboard with a decent chipset (Z710) in order to run faster memory (2.66GHz), but that isn't necessary. It is not a K-model, and there are two SKUs, the 6100 (higher TDP and higher clock speed) and the 6100T (lower TDP, lower clock speeds) so make sure you choose the right one.
Using a 14nm node, it reaches 3.7GHz with a 65W TDP; its dual-core/4-thread configuration should make for a decent gaming rig, and the 4K-capable Intel HD 530 GPU is clocked at 350MHz. Oh and it should make a fairly good overclocker as well.
4. AMD Sempron 3850
Its most affordable quad-core chip
Processor Cores: 4 | Thermal Design Power: 25W | Graphics Controller: AMD Radeon HD 8280 | Clock Speed: 1.3GHz | Processor Socket: AM1 | L2 Cache: 2MB
AMD Sempron 3850
At the other end of the spectrum is the Sempron 3850, one of AMD's cheapest quad-core processors. It sports a Kabini core and is built on a 28nm process, which explains why its TDP only reaches 25W, almost one seventh of the FX-9590.
Obviously, the fact that it runs at only 1.3GHz also helps a lot. Add in the fact that it comes with an integrated AMD Radeon HD 8280 GPU (basic, but decent) and you get something that's better than most Baytrail-based systems at least. The best part though has to be the price; it is cheap especially, as it includes the heat sink and the fan; that means that you can envisage getting a motherboard bundle for less than Intel's cheapest CPU. A shame that it has only one memory channel though.
Note that the Athlon X2 340, a different beast altogether (a different socket and no GPU), is AMD's next cheapest processor, costing about 10 percent more.
5. Intel Pentium G4400
Skylake on a budget
Processor Cores: 2 | Thermal Design Power: 65W | Graphics Controller: Intel HD Graphics 510 | Clock Speed: 3.3GHz | Processor Socket: FCLGA1151 | L2 Cache: 3MB
Intel Pentium G4400
Its predecessor, the Pentium G3258, was one of the best options at the lower end of the market, and the G4400 is a shoe-in replacement offering Skylake architecture on a budget. The laws of supply and demand means that it is actually retailing for cheaper than the G3258 or the slower Celeron parts.
This chip sports 3MB of L2 cache, hits 3.3GHz on its dual-core, two-thread setup with a TDP of 54W. It doesn't have an unlocked multiplier like the G3258 though but its improved processor graphics (HD510) can support DirectX 12, 4K resolutions at 60Hz over DisplayPort which makes it great for a home theatre PC.
Note that there is a slower version (G4400TE, with a much lower TDP), which is great if you want an even quieter model to build your rig on.
6. Intel Core i7-6700K
This quad-core one's a bit different
Processor Cores: 4 | Thermal Design Power: 91W | Graphics Controller: Intel HD Graphics 530 | Clock Speed: 4.0GHz | Processor Socket: LGA 1151 | L2 Cache: 4 x 256KB
This is Skylake, Intel's sixth Core generation. The i7-6700K, which cost just under $345 (£290, about AU$463), is the company's most powerful Skylake model set to replace the Broadwell-based desktop processors in the short term.
Here we've got a pretty powerful processor boasting four cores, eight threads, 8MB cache, a base clock speed of 4GHz, a turbo-boost of 4.2GHz and an Intel HD Graphics 530 subsystem inside. Overclocking is what may get some of us excited, however, as it's the distinguishing feature of the "K" models such as itself.
Pair that with a decent 100-series chipset, an oversized HSF and a couple of overclocker-friendly DDR4 memory modules, and watch it fly. And, although you'll want to pay close attention to that 91W TDP, 5.0GHz isn't a lofty goal with the 6700K.
Read the full review: Intel Core i7-6700K
7. Intel Core i5-4690K
One of Intel's best-selling parts
Processor Cores: 4 | Thermal Design Power: 88W | Graphics Controller: Intel HD Graphics 4600 | Clock Speed: 3.5GHz | Processor Socket: LGA 1150 | L2 Cache: 4 x 256KB
Intel Core i5-4690K
There is a good reason why the Intel Core i5-4690K is among the best-selling processors on Amazon.
This Devil's Canyon part is one of the most, if not the most affordable K-series processor from Intel's Core range at $239 (£182, about AU$321) and as such can overclock fairly easily with modest efforts. It has a base frequency of 3.5GHz with many users reporting being able to hit 25% increase in speed using a decent aftermarket HSF.
The 4690K doesn't come with hyper-threading, but for the price it wasn't expected. The processor, bilt on the 22nm fabrication process, packs 6MB of L2 cache, an 88W TDP and even an Intel HD Graphics 4600 onboard GPU.
8. AMD FX-8320E
One of the cheapest octa-core chips around
Processor Cores: 8 | Thermal Design Power: 95W | Graphics Controller: None | Clock Speed: 3.2GHz | Processor Socket: AM3+ | L2 Cache: 4 x 2MB
Meet the AMD FX-8320E; this is one of the cheapest eight-core processors on the market and costs a smidgen under $110 (£108, about AU$148) on Amazon.
Built on a mature 32nm node, it's clear why the FX-8320E has such a high TDP (95W). Then again, maybe it's not an unusual spec given the 3.2GHz clock speed. Plus, when needed, it can even boost all the way to 4GHz.
But don't get your hopes too high, though. On most tasks, the FX-8320E will be outperformed even by a modest Haswell Core i3. Where it truly shines is when you throw multi-threaded jobs (encryption, encoding etc) at it, where it can beat even the more expensive Core i5 parts. What's more, many users have been able to overclock the chip easily using a non-stock heatsink fan, some all the way up to 4.8GHz.
9. Intel Core i7-5820K
Six cores pack with power
Processor Cores: 6 | Thermal Design Power: 140W | Graphics Controller: None | Clock Speed: 3.3GHz | Processor Socket: LGA 2011-v3 | L2 Cache: 6 x 256KB
Intel Core i7-5820K
With AMD ceding a bit of the limelight the past few years, Intel has gone back to releasing products that require a new socket on a quasi-yearly basis – great for sales, not great for customers. The Core i7-5820K, a Broadwell component, is no exception. It uses yet another socket aimed at the high-performance and server market.
What makes this little processor worth listing here is that even though it has all six cores intact, it isn't priced outrageously. At $389 (around £313, AU$507), it's really not a bad deal. Add in 15MB of cache, 12 threads and 28 PCI Express lanes, and you get a compelling compute solution. Shame about the TDP, a whopping 140W for a part that's clocked at 3.3GHz.
10. AMD Athlon x4-860K
Ideal for upgrading an existing AMD rig
Processor Cores: 4 | Thermal Design Power: 95W | Graphics Controller: None | Clock Speed: 3.7GHz | Processor Socket: FM2+ | L2 Cache: 4MB
AMD Athlon x4-860K
Like most other AMD CPUs in this list, this is an old CPU which managed to remain relevant by combining decent performance with a superbly low price. Since this is an Athlon model, it doesn't come with a GPU. It does however offer an unlocked clock multiplier which means that it is ideal if you want to overclock it.
It has all the necessary ingredients to be at the core of a great entry level computer. It is cheap, has four cores clocked at 3.6GHz (4GHz turbo) and, thanks to its 28nm manufacturing process, has a rather reasonable 95W TDP. Expect it to roughly match a Skylake-based Core i3-6100T CPUs albeit with a far higher TDP (three times) but almost half the price.
Gabe Carey has also contributed to this article