Intel Core i5-1335UE vs Intel Core i5-8600K Comparison

The Intel Core i5-1335UE and the Intel Core i5-8600K make for an unusual comparison: a modern low-power mobile processor against an older unlocked desktop chip. The recorded data shows a clean sweep for the newer part, with the i5-1335UE winning every single shared benchmark by roughly 17 percent. Despite that, the two chips sit in the same overall percentile in the database, at 51 percent each, and their average benchmark scores are close, 2907 for the i5-1335UE versus 2807 for the i5-8600K. What follows breaks down where that gap comes from and what it means in practical terms.

FAQ

Q: Which CPU is faster overall?

A: The Intel Core i5-1335UE wins every head-to-head benchmark in the database. It leads by 16.8 percent in Cinebench R15 multi-core (1013 versus 867), 16.4 percent in R15 single-core (142 versus 122), 16.7 percent in R20 multi-core (4221 versus 3616), 16.7 percent in R20 single-core (595 versus 510), 16.7 percent in R23 multi-core (10052 versus 8611), and 16.8 percent in R23 single-core (1419 versus 1215). That is a consistent advantage across the board, in both lightly and heavily threaded workloads.

Q: How do they compare to other CPUs in the database?

A: Both land in the 51st percentile against all recorded CPUs, which places each firmly in the middle of the pack. The i5-1335UE's nearest rivals by average score are the AMD Ryzen 5 PRO 1600 (2909), the Intel Xeon E-2414 (2905), the Intel Xeon E-2186M (2912), and the AMD Ryzen Embedded V3C14 (2921). The i5-8600K's closest neighbours include the Intel Atom x7211RE (2811), the Intel Core i5-11300H (2792), the Intel Xeon E-2324G (2823), and the Intel Xeon E5-4627 v3 (2789).

Q: Which chip uses less power?

A: The i5-1335UE, by a wide margin. Its rated TDP is 15 watts, compared with 95 watts for the i5-8600K. The mobile part delivers more performance while drawing a fraction of the power on paper.

Q: Can either CPU be overclocked?

A: Only the i5-8600K. Its multiplier is unlocked, whereas the i5-1335UE has a locked multiplier. Note that the benchmark scores in the database reflect stock operation.

Q: Are these CPUs still in production?

A: The i5-1335UE is listed as Active, while the i5-8600K is End-of-life. The desktop chip launched on October 4, 2017, with a launch MSRP of $257. The i5-1335UE launched on January 3, 2023.

Q: What memory do they support?

A: The i5-1335UE supports both DDR4 and DDR5 on a dual-channel bus. The i5-8600K supports DDR4 only, also dual-channel, with a recorded memory bandwidth of 42.7 GB/s.

Architecture Differences

These are two very different Intel designs separated by several generations. The i5-1335UE is built on the Raptor Lake architecture (codename Raptor Lake-U) on a 10 nm process at Intel's own foundry. The i5-8600K is Coffee Lake on a 14 nm process. The node shrink alone explains a large part of the efficiency story: the newer chip fits ten cores and twelve threads into a 15 watt envelope, while the older one runs six cores and six threads at 95 watts.

The core topology favors the newer part. Ten cores with twelve threads gives the i5-1335UE both more physical cores and the ability to run two threads on selected cores, which is why the multi-core lead holds steady near 17 percent in every Cinebench generation recorded. The i5-8600K, with six cores and no hyperthreading, has to rely on raw clock speed.

Cache also tilts heavily toward the Raptor Lake chip. It carries 80 KB of L1 per core and 1.25 MB of L2 per core, with 12 MB of shared L3. The i5-8600K offers 64 KB of L1 per core, 256 KB of L2 per core, and 9 MB of shared L3. The per-core L2 difference is especially stark and contributes to the single-core advantage the newer chip shows even though both parts boost into the same general territory, 4.50 GHz for the i5-1335UE versus 4.30 GHz for the i5-8600K.

Platform features differ too. The i5-1335UE provides PCIe Gen 4 with 8 CPU lanes; the i5-8600K provides PCIe Gen 3 with 16 CPU lanes. One favors newer peripheral speeds, the other a wider link. The integrated graphics also differ: Iris Xe Graphics 80EU on the mobile part against UHD Graphics 630 on the desktop part. Neither supports ECC memory.

Head-to-Head Benchmarks

The head-to-head data is unambiguous: the i5-1335UE won all six shared tests, and the margins barely move between single-core and multi-core results.

Start with multi-core. In Cinebench R15 the i5-1335UE scores 1013 against 867, a 16.8 percent win. In R20 it posts 4221 versus 3616, up 16.7 percent. In R23 the gap is nearly identical: 10052 versus 8611, again 16.7 percent. The consistency across three Cinebench generations indicates the advantage is architectural rather than a quirk of one test. Ten cores and twelve threads simply outproduce six cores and six threads here, even though the mobile part operates at a far lower base clock, 1.3 GHz versus 3.6 GHz.

Single-core tells the same story. R15 goes to the i5-1335UE at 142 versus 122, a 16.4 percent lead. R20 single-core lands at 595 versus 510, a 16.7 percent advantage. R23 single-core reads 1419 versus 1215, up 16.8 percent. For a desktop chip with a higher base clock and an unlocked multiplier, this is the surprising result: the newer architecture, larger L2 cache, and higher 4.50 GHz boost overcome the older design at stock settings.

The database also holds Geekbench results for the i5-8600K alone, 5997 multi-core and 1514 single-core, with no matching i5-1335UE entries, so no direct comparison can be drawn from that test. The overall picture from the shared data is a uniform sweep with a margin hovering around the 17 percent mark in every discipline.

Specification Differences

The two processors differ in nearly every specification that matters:

• Cores/threads: 10 cores, 12 threads on the i5-1335UE versus 6 cores, 6 threads on the i5-8600K.
• Base clock: 1.3 GHz versus 3.6 GHz, in the i5-8600K's favor on paper.
• Boost clock: 4.50 GHz versus 4.30 GHz, slightly in the newer chip's favor.
• TDP: 15 watts versus 95 watts.
• Socket: Intel BGA 1744 (soldered mobile packaging) versus Intel Socket 1151.
• Process node: 10 nm versus 14 nm.
• Cache: 80 KB L1 per core, 1.25 MB L2 per core, 12 MB L3 versus 64 KB L1 per core, 256 KB L2 per core, 9 MB L3.
• Memory: DDR4 and DDR5 support versus DDR4 only.
• PCIe: Gen 4, 8 CPU lanes versus Gen 3, 16 CPU lanes.
• Graphics: Iris Xe Graphics 80EU versus UHD Graphics 630.
• Multiplier: locked versus unlocked.
• Market and status: Active mobile part versus End-of-life desktop part.

The Verdict

On pure performance data, the i5-1335UE is the better processor, full stop. It wins all six shared benchmarks by 16 to 17 percent while carrying a TDP roughly one-sixth that of the i5-8600K. If the decision is purely about measured throughput per watt of rated power, the mobile part is not close to contested.

But the data also highlights what the i5-8600K still offers: a standard Socket 1151 desktop platform, twice the CPU PCIe lanes, an unlocked multiplier for tuning, and Geekbench results (5997 multi-core, 1514 single-core) recorded in the database. Buyers choosing between these two are really choosing between platform types. The BGA 1744 packaging of the i5-1335UE means it lives soldered inside laptops and compact systems; it is not a chip you drop into a desktop board. The i5-8600K fits standard Socket 1151 motherboards, though it is now End-of-life.

Both parts sit in the 51st percentile of all recorded CPUs, so neither is a performance outlier today. The i5-1335UE's average score of 2907 places it alongside the Ryzen 5 PRO 1600 and Xeon E-2186M, while the i5-8600K's 2807 puts it near the Core i5-11300H and Xeon E-2324G. Functionally, they occupy the same performance neighborhood, with the newer chip holding the edge.

Where Each One Wins

Intel Core i5-1335UE wins on:

• Every recorded Cinebench test, single-core and multi-core, by roughly 17 percent.
• Efficiency-sensitive designs: 15 watt TDP against 95 watts makes it the only realistic choice for thin or fanless systems.
• Modern platform features: DDR5 memory support, PCIe Gen 4, and the stronger Iris Xe 80EU integrated graphics.
• Longevity: it is an Active product from a 2023 launch, versus an End-of-life 2017 desktop part.

Intel Core i5-8600K wins on:

• Desktop build flexibility: Socket 1151 support and standard socketed installation, against soldered BGA 1744 packaging.
• Expandable peripheral connectivity: 16 CPU PCIe lanes versus 8, useful for multi-card configurations, though at Gen 3 rather than Gen 4.
• Tuning headroom: the unlocked multiplier allows overclocking, an option the locked i5-1335UE does not provide.
• Sustained high base clock: 3.6 GHz base versus 1.3 GHz, which can matter in scenarios where the mobile part's low-power design limits its floor.

In short, the recorded data gives the performance crown cleanly to the i5-1335UE, and the i5-8600K's case rests entirely on the desktop platform and tuning freedom it provides.