Intel Core 5 221E vs Intel Core Ultra 5 135UL Comparison

Head-to-Head Benchmarks

The Intel Core 5 221E demonstrates a commanding performance advantage over the Intel Core Ultra 5 135UL across the recorded benchmark suite. The database contains seventeen benchmark entries for the Core 5 221E, while the Core Ultra 5 135UL has no recorded benchmark scores, resulting in a complete sweep for the Core 5 221E across all measured tests.

Cinebench results show the Core 5 221E delivering 2613 points in the R15 multicore test, 368 points in R15 single-core, 10891 points in R20 multicore, 1537 points in R20 single-core, 25933 points in R23 multicore, and 3661 points in R23 single-core. These scores place the processor at the 87th percentile among all CPUs in the database, with an average benchmark score of 40144 across all tests.

The Passmark suite further illustrates the Core 5 221E's capabilities. Data compression scores reach 324285, data encryption hits 19205, extended instructions measure 18216, and prime number finding scores 173. Floating point math delivers 79028, integer math reaches 117813, and multithread performance scores 30510. Physics testing produces 2230, random string sorting achieves 37686, and single-thread performance measures 4147.

The nearest rivals for the Core 5 221E provide context for these numbers. The AMD Ryzen 7 7700 posts an average score of 40081, which is 0.2% lower than the Core 5 221E. The AMD Ryzen AI 9 365 also scores 40048, another 0.2% deficit. The AMD Ryzen 9 270 achieves 40246, which is 0.3% higher than the Intel part. The Intel Core i9-13905H scores 40313, 0.4% ahead. These margins are tight, indicating the Core 5 221E competes directly with mid-range and upper-mid-range processors from both AMD and Intel.

Since the Core Ultra 5 135UL has no benchmark data in the database, direct head-to-head comparisons rely on architectural specifications rather than measured performance. The Core 5 221E offers 14 cores and 20 threads, while the Core Ultra 5 135UL provides 12 cores and 14 threads. The core and thread count differences alone suggest a substantial performance gap in heavily threaded workloads.

Architecture Differences

The two processors come from different architectural lineages within Intel's product stack. The Core 5 221E uses the Bartlett Lake codename and belongs to the Core 5 generation, built on Intel's 10 nm process node. The Core Ultra 5 135UL uses the Meteor Lake architecture, specifically the Meteor Lake-PS codename, and belongs to the Core Ultra Series 1 generation, built on Intel's 7 nm process node. Both are manufactured by Intel.

Socket compatibility differs significantly. The Core 5 221E uses Intel Socket 1700, while the Core Ultra 5 135UL uses Intel Socket 1851. This means the two processors are not interchangeable in existing motherboards, and platform choice will dictate which processor can be used.

Cache hierarchies show notable structural differences. The Core 5 221E provides 80 KB of L1 cache per core, 2 MB of L2 cache per core, and 24 MB of shared L3 cache. The Core Ultra 5 135UL provides 112 KB of L1 cache per core, 2 MB of L2 cache per core, and only 12 MB of shared L3 cache. The Core 5 221E therefore has double the L3 cache of the Core Ultra 5 135UL, which can benefit workloads with large working sets that rely on cache residency.

Clock speeds differ substantially. The Core 5 221E has a base clock of 2.70 GHz and a boost clock of 5.20 GHz. The Core Ultra 5 135UL has a base clock of 1.60 GHz and a boost clock of 4.40 GHz. The Core 5 221E runs at higher frequencies across both base and boost states, contributing to its single-thread performance advantages.

Thermal design power also diverges sharply. The Core 5 221E has a TDP of 65 watts, while the Core Ultra 5 135UL has a TDP of 15 watts. This reflects different design priorities: the Core 5 221E targets higher sustained performance with more power available, while the Core Ultra 5 135UL emphasizes efficiency and lower power consumption.

Memory support differs in one key aspect. Both processors support DDR5 memory and use dual-channel memory buses with identical memory bandwidth of 89.6 GB/s. However, the Core 5 221E also supports DDR4 memory and includes ECC memory support, while the Core Ultra 5 135UL supports only DDR5 with memory configuration dependent on the motherboard and does not support ECC memory.

PCIe connectivity shows generational differences. The Core 5 221E provides PCIe Gen 5 with 16 lanes available for CPU-attached devices. The Core Ultra 5 135UL provides PCIe Gen 4 with 8 lanes for CPU-attached devices. This gives the Core 5 221E both a newer PCIe generation and more available lanes for expansion cards, NVMe storage, and other peripherals.

Integrated graphics also differ between the two. The Core 5 221E includes UHD Graphics 730, while the Core Ultra 5 135UL includes Arc Xe-LPG 64EU. The Arc graphics solution represents a newer graphics architecture from Intel, though the database does not contain benchmark comparisons between the two iGPU solutions.

Release timing places the Core Ultra 5 135UL in April 2024 and the Core 5 221E in January 2025. Both processors remain in active production status, and neither has an unlocked multiplier for overclocking.

Where Each One Wins

The Core 5 221E wins across every measured benchmark category in the database. Its higher core count, thread count, clock speeds, and larger L3 cache give it clear advantages in both single-threaded and multi-threaded workloads. The 87th percentile ranking among all CPUs confirms that this processor sits in the upper tier of overall performance.

Workloads that benefit from high multithreaded throughput will favor the Core 5 221E. The 14 cores and 20 threads, combined with a 5.20 GHz boost clock and 24 MB of L3 cache, make it suitable for rendering, video encoding, compilation, scientific computing, and other parallel workloads. The Cinebench R23 multicore score of 25933 indicates strong scaling across the available cores.

Single-threaded performance also favors the Core 5 221E. The 5.20 GHz boost clock and the R23 single-core score of 3661 place it well ahead of the Core Ultra 5 135UL's 4.40 GHz boost clock. Applications that depend on high per-core performance, such as gaming, legacy software, and lightly threaded productivity tools, will see better responsiveness on the Core 5 221E.

The Core Ultra 5 135UL wins in efficiency and platform flexibility. Its 15 watt TDP makes it suitable for compact desktop systems, fanless designs, or environments with thermal constraints. The Arc Xe-LPG 64EU integrated graphics provide a modern graphics solution for media playback and light gaming without a discrete GPU. The Core Ultra 5 135UL also uses the newer Intel Socket 1851 platform, which may offer longer platform longevity for future upgrades.

For systems where low power consumption is critical, the Core Ultra 5 135UL's 15 watt TDP stands in contrast to the Core 5 221E's 65 watt TDP. This makes the Core Ultra 5 135UL potentially preferable for always-on systems, thin clients, or embedded deployments where power budgets are tight.

The Core 5 221E's support for both DDR4 and DDR5 memory gives it broader memory compatibility than the Core Ultra 5 135UL, which supports only DDR5. Systems with existing DDR4 memory could reuse those modules with the Core 5 221E, potentially reducing upgrade costs, though the database does not quantify this benefit.

ECC memory support on the Core 5 221E makes it suitable for error-sensitive workloads such as financial modeling, database servers, or any application where data integrity is paramount. The Core Ultra 5 135UL lacks ECC support, which may disqualify it from certain enterprise or reliability-focused deployments.

FAQ

Q: Which processor has more cores and threads?

A: The Intel Core 5 221E has 14 cores and 20 threads, while the Intel Core Ultra 5 135UL has 12 cores and 14 threads. The Core 5 221E offers two additional cores and six additional threads.

Q: What are the boost clock speeds of each processor?

A: The Intel Core 5 221E boosts to 5.20 GHz, while the Intel Core Ultra 5 135UL boosts to 4.40 GHz. The Core 5 221E has a base clock of 2.70 GHz, and the Core Ultra 5 135UL has a base clock of 1.60 GHz.

Q: Do these processors support ECC memory?

A: The Intel Core 5 221E supports ECC memory, while the Intel Core Ultra 5 135UL does not. Both processors support DDR5 memory, and the Core 5 221E additionally supports DDR4.

Q: What PCIe generations do the two processors use?

A: The Intel Core 5 221E provides PCIe Gen 5 with 16 CPU lanes, while the Intel Core Ultra 5 135UL provides PCIe Gen 4 with 8 CPU lanes. This gives the Core 5 221E more bandwidth and lane count for expansion devices.

Q: What is the TDP of each processor?

A: The Intel Core 5 221E has a TDP of 65 watts, and the Intel Core Ultra 5 135UL has a TDP of 15 watts. The Core Ultra 5 135UL is designed for much lower power consumption.

Q: Which processor uses the newer socket?

A: The Intel Core Ultra 5 135UL uses Intel Socket 1851, while the Intel Core 5 221E uses Intel Socket 1700. The Core Ultra 5 135UL's socket is newer, though the Core 5 221E supports both DDR4 and DDR5 memory.

Specification Differences

The two processors differ in nearly every measurable specification. The Intel Core 5 221E offers 14 cores and 20 threads, while the Intel Core Ultra 5 135UL offers 12 cores and 14 threads. Core counts differ by two cores, and thread counts differ by six threads.

Clock speeds are significantly different. The Core 5 221E has a base clock of 2.70 GHz and a boost clock of 5.20 GHz, while the Core Ultra 5 135UL has a base clock of 1.60 GHz and a boost clock of 4.40 GHz. The Core 5 221E runs 1.10 GHz higher at base and 0.80 GHz higher at boost.

Thermal design power differs by 50 watts. The Core 5 221E is rated at 65 watts TDP, while the Core Ultra 5 135UL is rated at 15 watts TDP.

Sockets are incompatible between the two. The Core 5 221E uses Intel Socket 1700, and the Core Ultra 5 135UL uses Intel Socket 1851.

Process nodes differ by generation. The Core 5 221E uses Intel's 10 nm process, while the Core Ultra 5 135UL uses Intel's 7 nm process.

Cache configurations show differences in L1 and L3. The Core 5 221E has 80 KB of L1 per core and 24 MB of shared L3, while the Core Ultra 5 135UL has 112 KB of L1 per core and 12 MB of shared L3. Both use 2 MB of L2 per core.

Memory support differs. The Core 5 221E supports DDR4 and DDR5, while the Core Ultra 5 135UL supports only DDR5 with motherboard-dependent configuration. Both use dual-channel memory buses with 89.6 GB/s bandwidth.

ECC memory support is present on the Core 5 221E and absent on the Core Ultra 5 135UL.

PCIe capabilities differ by generation and lane count. The Core 5 221E provides Gen 5 with 16 CPU lanes, and the Core Ultra 5 135UL provides Gen 4 with 8 CPU lanes.

Integrated graphics differ. The Core 5 221E uses UHD Graphics 730, and the Core Ultra 5 135UL uses Arc Xe-LPG 64EU.

Release dates differ by approximately nine months. The Core Ultra 5 135UL was released in April 2024, and the Core 5 221E was released in January 2025. Both processors remain in active production, and neither has an unlocked multiplier.

The launch MSRP for the Core 5 221E is $232, and the launch MSRP for the Core Ultra 5 135UL is $331. The Core 5 221E is therefore less expensive at launch despite its higher performance in the database benchmarks.