Intel Core Ultra 245KF Desktop Review UK (2026). Benchmarked & Rated

There's a question that comes up constantly when people are piecing together a mid-range gaming PC: do you actually need all those cores, or is the chip with fewer, faster cores going to serve you better? The Intel Core Ultra 5 Desktop Processor 245KF sits right in the middle of that debate. Fourteen cores, a 5.2 GHz boost clock, no integrated graphics, and a 125W base power rating. On paper, it looks like a proper budget-to-mid-range gaming chip that doesn't mess about.

The verdict? This is a genuinely solid processor for gamers and everyday productivity users who are happy to pair it with a dedicated GPU. It's not the fastest chip Intel makes, and it's not trying to be. But at its price point in the budget CPU bracket, it offers a combination of modern architecture, PCIe 5.0 support, and a respectable boost clock that makes it hard to dismiss. The 4.4-star average from 147 owners backs that up. Most people who bought it are happy. So let's get into why, and who this chip is actually right for.

The 'K' in the name means it's unlocked for overclocking, which is a nice bonus at this price tier. The chip supports DDR5 memory and PCIe Gen 5 and Gen 4, so you're getting a genuinely modern platform underneath you. That matters a lot for longevity, especially if you're planning to upgrade your GPU down the line to something that benefits from PCIe 5.0 bandwidth.

Here's a quick spec rundown:

In practice, this means the 245KF has 14 physical cores and 14 threads total. Compare that to Raptor Lake chips that had 20 threads from 14 cores, and you can see why some workloads, particularly older, heavily-threaded applications that were tuned for SMT, might see different results. For gaming, though, the story is more nuanced. Most games don't saturate threads that aggressively, and the Arrow Lake architecture brings genuine IPC improvements over the previous generation that help close any gap.

The hybrid core design itself is well-established at this point. The P-cores handle your latency-sensitive, single-threaded work: gaming frame pacing, browser rendering, real-time audio. The E-cores quietly chew through background tasks, compression, and lightly-threaded productivity work. Windows 11's scheduler is much better at routing tasks to the right core type than it used to be, so in day-to-day use the hybrid layout is largely invisible. You just get a fast, responsive system.

One thing worth understanding about Arrow Lake boost behaviour is that the Turbo Boost system is more conservative than some previous Intel generations. Intel tuned Arrow Lake to prioritise sustained performance over short-burst spikes. What that means in practice is that the chip tends to hold its boost clocks for longer under sustained load rather than hitting a high peak briefly and then throttling back. For gaming, that's actually a good thing. Frame times are more consistent when the CPU isn't bouncing between boost states.

The base power figure of 125W is relevant here too. Unlike some Intel chips that can spike well above their rated TDP under Turbo Boost, the 245KF's power behaviour is tied to that 125W envelope more predictably. Motherboard power delivery settings and any manual overclocking will change this, but out of the box you're looking at a chip that a decent mid-range cooler can handle without drama. More on that in the cooling section.

One thing that catches people out: LGA1851 is not backwards compatible with LGA1700 motherboards from the Raptor Lake era. So if you're upgrading from a 12th or 13th Gen Intel system, you're looking at a full platform swap. That's a motherboard and potentially a cooler bracket change too, depending on what you're running. The upside is that LGA1851 is Intel's current socket, and there's a reasonable expectation it'll support future CPU generations, though Intel hasn't made any firm multi-generation socket promises.

The platform's PCIe 5.0 support is a genuine selling point for future-proofing. PCIe 5.0 SSDs are becoming more mainstream, and next-generation GPUs are beginning to take advantage of PCIe 5.0 bandwidth. Getting that support at this price point is not something you should take for granted. The platform also retains PCIe 4.0 lanes for secondary devices, so you're not forced to buy PCIe 5.0 peripherals to make use of the platform.

The practical consequence is that you cannot boot this system without a discrete GPU installed. There's no fallback display output from the motherboard if your graphics card fails or is temporarily removed. For most gamers, this is a non-issue. But if you're building a system that might occasionally run headless, or if you want the option to troubleshoot display issues without a GPU, the standard 245K (with integrated graphics) might be worth the small premium.

It's also that the integrated graphics on the non-F Arrow Lake parts aren't particularly powerful anyway. They're fine for desktop use and light video playback, but nobody is gaming on them. So the real-world gap between the 245K and 245KF for a gaming build is essentially zero. Save the money, buy the KF, spend the difference on a slightly better GPU or a faster SSD.

For rendering, compilation, or other productivity workloads that genuinely hammer all 14 cores, you'll be closer to that 125W figure consistently. That's not particularly alarming for a modern desktop CPU. For context, AMD's competing Ryzen 7 9700X has a 65W TDP, so it runs noticeably cooler, but Intel's chip has its own performance characteristics that make the comparison more complex than just wattage. Arrow Lake is more power-efficient than Raptor Lake was at comparable performance levels, which is a genuine improvement.

For PSU sizing, a 550W to 650W unit is plenty comfortable for a system built around the 245KF with a mid-range GPU like an RTX 4070 or RX 7800 XT. If you're pairing it with something like an RTX 4080 or higher, bump that to 750W or 850W to give yourself headroom. There's no need to go overboard here. The chip is not a power hog by modern standards.

For stock operation at 125W, a decent mid-range air cooler will do the job. Something in the class of a 120mm to 160mm tower cooler (think a budget Noctua, a be quiet! Pure Rock 2, or a DeepCool AK400) will keep the chip comfortable without spending a fortune. If you're planning to overclock, or if you want to keep temperatures low for sustained productivity workloads, a 240mm AIO liquid cooler is a sensible step up. The 245KF isn't an unreasonable chip to cool. It's not a 253K pushing 250W.

Owner feedback on Amazon is worth paying attention to here. Several reviewers noted that temperatures are very manageable with a mid-range air cooler, which aligns with what you'd expect from a 125W chip on Arrow Lake's more refined power delivery. A handful of overclockers went for 280mm or 360mm AIOs to give themselves headroom for pushing the chip harder, which makes sense if that's your plan. But for a stock gaming build, don't feel pressured into buying an expensive cooler. A solid air cooler in the £40 to £60 range is genuinely sufficient.

Multi-core performance is where the picture gets more interesting. The 14-core layout with 6 P-cores and 8 E-cores gives the 245KF a reasonable multi-threaded score for its class, but the removal of Hyper-Threading on P-cores means it doesn't punch as far above its weight in heavily-threaded workloads as you might hope. In Blender-style rendering benchmarks, chips with more physical cores or SMT-enabled P-cores can pull ahead. The 245KF is not a rendering powerhouse. It's a well-rounded gaming and productivity chip.

In integer and floating-point workloads like those tested by 7-Zip or similar compression benchmarks, the E-cores contribute meaningfully to multi-threaded throughput. This is actually one of the underrated strengths of Intel's hybrid architecture. The E-cores are efficient and capable, not just idle-management cores. So while the 245KF won't top the charts in any single benchmark category, it tends to be a consistent, well-rounded performer across a variety of workloads. That's exactly what most people actually need.

For more demanding productivity work, things like video editing in Premiere Pro, compiling code, or running virtual machines, the 245KF is capable but not exceptional. It handles these tasks well, and for most home users or small creators it's more than sufficient. Where it starts to feel its limits is in very long rendering queues or large dataset compilation jobs where a chip with more cores (or SMT-enabled P-cores) would finish noticeably faster. If that's your primary use case, the Core Ultra 7 265K with its higher core count deserves a look.

Owner reviews on Amazon paint a consistent picture. People building gaming and home office rigs are very satisfied. The 4.4-star average from 147 is not an accident. Multiple owners specifically mention how well the chip handles multitasking, running games while streaming or recording, and general system responsiveness. A few productivity-focused users note that they wish they'd gone for the Ultra 7 variant for heavier workloads, which is honest and useful context. But for the target audience of this chip, the feedback is overwhelmingly positive.

At 1440p and 4K, the GPU becomes the dominant bottleneck in most games, and the CPU matters less in terms of average frame rates. But 1% low frame times, the metric that determines whether a game feels smooth or stuttery, still benefit from a fast CPU. The 245KF's combination of fast P-cores and capable E-cores for background task management means frame pacing tends to be clean. Owners specifically mention smooth gameplay experiences across a variety of titles, which aligns with what you'd expect from this architecture.

The 'KF' designation and the lack of integrated graphics is genuinely irrelevant to gaming performance. You're using a discrete GPU anyway. What matters is that the chip gets out of the GPU's way quickly and feeds it data fast enough to keep frames flowing. The Arrow Lake platform's PCIe 5.0 support means even the most demanding current and near-future GPUs won't be bandwidth-limited by the CPU platform. For a gaming-focused build, this is a properly capable chip that doesn't require you to spend on a Core Ultra 7 or Core Ultra 9 to get excellent results.

Intel's officially supported speeds for Arrow Lake are DDR5-6400 with XMP (Extreme Memory Profile), and the platform generally handles XMP profiles well. Many owners report running DDR5-6000 or DDR5-6400 kits without issue, which is the sweet spot for performance on this platform. Going much higher than DDR5-6400 can require more manual tuning and isn't always stable without dialling in subtimings, so it's not something to chase unless you enjoy memory overclocking as a hobby.

The 245KF supports a dual-channel memory configuration, which is the standard for desktop CPUs at this level. Make sure you install your RAM in the correct slots for dual-channel operation (usually slots 2 and 4, but check your motherboard manual). Running in single-channel with a single stick of RAM will noticeably hurt performance, particularly in gaming. Two sticks of matched DDR5 memory in dual-channel is the right setup here, and it makes a measurable difference to real-world responsiveness.

That said, Arrow Lake's overclocking ceiling isn't dramatically higher than its stock performance. The chip is already running close to its architectural limits at 5.2 GHz boost. You might squeeze out an extra 200 to 300 MHz on the P-cores with a good cooler and a Z890 board, which translates to a modest but real performance gain. Memory overclocking tends to have a bigger impact on this platform than CPU frequency overclocking alone, so if you're going to invest time in tuning, start with your RAM settings.

Owner feedback on overclocking is generally positive. People who went for Z890 boards and a 240mm or larger AIO report stable overclocks without excessive temperatures. Nobody's claiming massive gains, but the chip responds well to tuning and doesn't require exotic cooling to get there. If you're buying the 245KF specifically to overclock, make sure you budget for a Z890 motherboard (B860 locks the multiplier) and a proper cooler. On a B860 board at stock settings, you're still getting a very capable chip, just without the headroom to push further.

The 245K (non-F) is the other comparison. It's the same chip with Intel's integrated graphics enabled. If you're building a system where you want the option to run without a discrete GPU, or if you want a display output for troubleshooting, the 245K is worth the small premium. For a dedicated gaming build where you're always going to have a GPU installed, the 245KF makes more financial sense. The performance difference between the two is zero in gaming.

The Ryzen 5 9600X's lower power draw is a real advantage if you're building in a small form factor case or want a quieter system. The 245KF wins on total core count and multi-threaded throughput, but the 9600X's Zen 5 IPC is strong and its gaming performance is very close. Honestly, either chip is a good choice at this price tier. The platform decision (AM5 vs LGA1851) and whether you want integrated graphics might end up being the deciding factor more than raw performance differences.

The honest caveats are real but manageable. No integrated graphics means you're committed to a discrete GPU. No stock cooler means extra budget required. The 125W TDP is higher than AMD's competing Ryzen 5 9600X, so it runs warmer and needs a better cooler. And if your workload is primarily heavy rendering or compilation rather than gaming, the Core Ultra 7 265K's higher core count would serve you better. But those are targeted limitations, not fundamental flaws.

Who should buy this? Gamers building their first proper desktop who want a modern platform without paying Core Ultra 7 prices. Home office users who also game and want a chip that handles both without compromise. Anyone who's upgrading from an older Intel platform and wants to land on a current socket with room to grow. This is a chip for people who want something sorted and capable without overthinking it.

Who should skip it? If you're primarily a content creator doing long rendering jobs, go for the Core Ultra 7 265K and don't look back. If you need integrated graphics for a secondary display or troubleshooting, grab the 245K instead. And if you're building a very compact, low-power system where thermals and noise are the priority, the Ryzen 5 9600X's 65W TDP is a more appropriate choice. The 245KF is not the right tool for every job, but for its intended job, it does it well.

At £139.99, this sits comfortably in the budget CPU bracket and represents genuine value for a gaming-focused build. The rating from us: 8 out of 10. Solid chip, sensible price, modern platform. Just don't forget to budget for a cooler.