Intel Core i5-1335UE vs Intel Core i7-6800K Comparison

FAQ

Q: Which processor is faster in Cinebench R23 multi-core?

A: The Intel Core i5-1335UE scores 10052 in Cinebench R23 multi-core, while the Intel Core i7-6800K scores 9093. The i5-1335UE wins by 10.5%.

Q: Does the Intel Core i7-6800K have integrated graphics?

A: No, the Intel Core i7-6800K has no integrated graphics. The Intel Core i5-1335UE includes Iris Xe Graphics 80EU.

Q: What is the TDP difference between these two CPUs?

A: The Intel Core i5-1335UE has a TDP of 15 watts, while the Intel Core i7-6800K has a TDP of 140 watts. That is a 125-watt difference in favor of the i5-1335UE.

Q: Which processor supports quad-channel memory?

A: The Intel Core i7-6800K supports quad-channel DDR4 memory with a memory bandwidth of 76.8 GB/s. The Intel Core i5-1335UE supports dual-channel DDR4 and DDR5 memory.

Q: Are both CPUs unlocked for overclocking?

A: No. The Intel Core i7-6800K has an unlocked multiplier, while the Intel Core i5-1335UE does not.

Q: What are the release dates for these processors?

A: The Intel Core i5-1335UE was released in January 2023, and the Intel Core i7-6800K was released in May 2016. The i7-6800K is end-of-life, while the i5-1335UE is still active.

Architecture Differences

The Intel Core i5-1335UE is built on Raptor Lake architecture using a 10 nm process node, while the Intel Core i7-6800K uses Broadwell architecture on a 14 nm process node. This process advantage allows the newer chip to deliver higher performance per watt, which is reflected in the massive TDP gap: 15 watts versus 140 watts.

The core configurations differ significantly. The i5-1335UE packs 10 cores and 12 threads, whereas the i7-6800K has 6 cores and 12 threads. Both processors support 12 threads, but the i5-1335UE does so with a hybrid arrangement that includes more physical cores. Cache layouts also diverge: the i5-1335UE has 80 KB of L1 cache per core and 1.25 MB of L2 cache per core, with 12 MB of shared L3 cache. The i7-6800K has 64 KB of L1 per core, 256 KB of L2 per core, and a larger 15 MB of shared L3 cache.

Clock speeds tell a clear story of design intent. The i5-1335UE has a base clock of 1300 MHz and can boost to 4.50 GHz, while the i7-6800K has a base clock of 3.40 GHz and boosts to only 3.60 GHz. The newer chip's boost ceiling is substantially higher, which directly contributes to its single-threaded dominance.

Memory support differs by generation and channel count. The i5-1335UE supports both DDR4 and DDR5 over a dual-channel bus. The i7-6800K supports only DDR4 but uses a quad-channel bus with a rated memory bandwidth of 76.8 GB/s. The older platform's wider memory path is its sole memory advantage.

PCIe capabilities also differ. The i5-1335UE provides Gen 4 with 8 lanes, while the i7-6800K provides Gen 3 with 28 lanes. The newer standard offers higher per-lane bandwidth, but the older chip has more lanes for expansion. The i5-1335UE includes integrated Iris Xe Graphics 80EU, while the i7-6800K has no integrated graphics at all. The i5-1335UE uses socket Intel BGA 1744 and targets mobile devices; the i7-6800K uses Intel Socket 2011-3 and targets desktop systems.

Head-to-Head Benchmarks

Across all six recorded Cinebench comparisons, the Intel Core i5-1335UE wins every test. The smallest margin is 10.1% in Cinebench R15 single-core, and the largest is 10.6% in three separate tests. This is a clean sweep with no benchmark where the i7-6800K takes a lead.

In Cinebench R15 multi-core, the i5-1335UE scores 1013 against the i7-6800K's 916, a 10.6% advantage. The single-core R15 result shows 142 versus 129, a 10.1% edge for the newer chip. These results establish the pattern: the i5-1335UE is faster in both single-threaded and multi-threaded workloads.

Moving to Cinebench R20, the i5-1335UE scores 4221 in multi-core versus 3819 for the i7-6800K, a 10.5% difference. In single-core R20, the scores are 595 versus 538, another 10.6% win. The consistency across rendering generations suggests the performance gap is structural rather than workload-specific.

Cinebench R23 confirms the trend. The i5-1335UE reaches 10052 in multi-core, while the i7-6800K manages 9093, a 10.5% advantage. In single-core R23, the scores are 1419 versus 1283, again a 10.6% margin. The i5-1335UE also holds a Geekbench advantage in the recorded data, with 5688 multi-core and 1237 single-core scores for the i7-6800K; the i5-1335UE does not have Geekbench scores in the database, so the head-to-head comparison relies on the Cinebench suite.

The average benchmark score places the i5-1335UE at 2907 against the i7-6800K's 2838. Both processors sit at the 51st percentile versus all CPUs, meaning they occupy the same overall performance tier despite the i5-1335UE's consistent head-to-head wins.

Specification Differences

The two processors differ in nearly every core specification. The i5-1335UE has 10 cores and 12 threads; the i7-6800K has 6 cores and 12 threads. Base clocks are 1300 MHz versus 3.40 GHz, while boost clocks are 4.50 GHz versus 3.60 GHz. TDP is 15 watts versus 140 watts.

Process node and architecture differ: 10 nm Raptor Lake against 14 nm Broadwell. The i7-6800K has documented transistor count of 3,400 million and a die size of 246 mm²; the i5-1335UE has no transistor or die size figures recorded. Cache configurations differ in L1 (80 KB per core versus 64 KB per core), L2 (1.25 MB per core versus 256 KB per core), and L3 (12 MB shared versus 15 MB shared).

Memory support differs: the i5-1335UE supports DDR4 and DDR5 over dual-channel, while the i7-6800K supports only DDR4 over quad-channel with a 76.8 GB/s bandwidth rating. PCIe versions and lane counts differ: Gen 4 with 8 lanes versus Gen 3 with 28 lanes. The i5-1335UE includes Iris Xe Graphics 80EU; the i7-6800K has none.

Socket and market segment differ: BGA 1744 mobile versus Socket 2011-3 desktop. Production status differs: active versus end-of-life. Release dates are January 2023 versus May 2016. The i7-6800K has an unlocked multiplier and a part number of SR2PD; the i5-1335UE is locked and has no part number recorded. The i7-6800K has a launch MSRP of $434, which can be stated once as the recorded launch MSRP.

The Verdict

The data is unambiguous. The Intel Core i5-1335UE outperforms the Intel Core i7-6800K in every recorded benchmark, with margins between 10.1% and 10.6%. Despite having fewer threads on paper in terms of core count parity, the i5-1335UE's newer architecture, higher boost clock, and greater core count deliver superior results across all Cinebench versions tested.

The i5-1335UE also achieves this while consuming a fraction of the power: 15 watts versus 140 watts. That is a decisive efficiency advantage. The i7-6800K's only clear hardware advantages are its larger L3 cache (15 MB versus 12 MB), quad-channel memory support with higher bandwidth, more PCIe lanes (28 versus 8), and an unlocked multiplier for overclocking.

For users who need a drop-in upgrade for an existing LGA 2011-3 platform, the i7-6800K remains a functional choice with its six cores and twelve threads. But for anyone selecting a new processor, the i5-1335UE is the better performer in every measured workload, with a much lower power envelope and integrated graphics support.

The percentile rankings reinforce this: both sit at the 51st percentile, but the i5-1335UE's average benchmark score of 2907 exceeds the i7-6800K's 2838. The newer mobile chip is not merely competitive; it is consistently ahead.

Where Each One Wins

The Intel Core i5-1335UE wins in every benchmark category recorded. Multi-core rendering favors it by 10.5% to 10.6% across Cinebench R15, R20, and R23. Single-core performance also favors it by 10.1% to 10.6% across the same suite. For any workload that relies on Cinebench-style rendering, the i5-1335UE is the clear choice.

The i5-1335UE also wins on platform flexibility. It supports both DDR4 and DDR5 memory, includes integrated Iris Xe Graphics 80EU, and operates within a 15-watt TDP. This makes it suitable for compact or mobile systems where power draw and space are constrained.

The Intel Core i7-6800K wins only in niche hardware attributes. Its quad-channel memory bus with 76.8 GB/s bandwidth exceeds the dual-channel configuration of the i5-1335UE, which matters for memory-bandwidth-sensitive workloads. Its 28 PCIe Gen 3 lanes provide more expansion capacity than the i5-1335UE's 8 Gen 4 lanes, which benefits multi-GPU or high-density storage configurations. The unlocked multiplier allows overclocking, a feature absent on the i5-1335UE. Its larger 15 MB L3 cache also exceeds the 12 MB found on the i5-1335UE.

However, the i7-6800K's desktop platform requires a 140-watt power budget and a dedicated graphics card, adding system cost and complexity. For users already invested in an LGA 2011-3 board, the i7-6800K remains serviceable, but it loses every performance comparison in the database. The i5-1335UE is the superior processor in all measured workloads, with the efficiency and integrated graphics to back it up.