Intel Core i7-9700K vs Intel Core Ultra 7 258V Comparison

The Intel Core Ultra 7 258V and Intel Core i7-9700K are both 8-core, 8-thread processors, but they represent entirely different eras of Intel design. The Ultra 7 258V is a modern, efficient mobile chip built on a 3 nm process, while the i7-9700K is a legacy desktop part on a 14 nm node. Benchmark data shows the Ultra 7 258V wins 15 of the 19 head-to-head tests, yet the i7-9700K retains specific strengths that keep it relevant in certain workloads.

Where Each One Wins

The Intel Core Ultra 7 258V dominates in single-threaded and lightly-threaded performance. Its wins in Cinebench R15 single-core (285 vs 174, a 63.8% lead) and PassMark single-thread (4018 vs 2865, a 40.2% lead) are decisive. This translates to faster everyday responsiveness and better performance in applications that rely on one or two cores. The Ultra 7 258V also excels in encryption and prime number finding, with a 194.9% advantage in PassMark data encryption and a 255.8% advantage in PassMark find prime numbers, indicating superior instruction-level efficiency and cryptographic throughput.

The Intel Core i7-9700K, conversely, wins in sustained all-core workloads that stress memory bandwidth and cache hierarchy. Its victories in Cinebench R23 multicore (12238 vs 10301, a 15.8% lead) and PassMark data compression (208062 vs 176686, a 15.1% lead) show that its older architecture still holds ground in certain streaming and compression tasks. The i7-9700K also wins in PassMark extended instructions (18088 vs 14717, an 18.6% lead) and random string sorting (25756 vs 21580, a 16.2% lead), suggesting that its larger per-core L2 cache and higher base clock benefit specific data manipulation workloads.

The split is clear: the Ultra 7 258V is faster for general productivity, math-heavy tasks, and anything sensitive to single-core speed, while the i7-9700K retains advantages in niche areas like compression and extended instruction sets. The average benchmark scores are nearly identical (20454 for the Ultra 7 258V vs 20271 for the i7-9700K), yet the distribution of wins favors the newer chip heavily.

Architecture Differences

The architectural gap is vast. The Intel Core Ultra 7 258V uses the Lunar Lake architecture on a 3 nm process from TSMC, while the Intel Core i7-9700K uses Coffee Lake on Intel's 14 nm process. The Ultra 7 258V has a base clock of 2.20 GHz and boosts to 4.80 GHz, whereas the i7-9700K has a higher base clock of 3.60 GHz and boosts to 4.90 GHz. Despite the lower clock speeds, the Ultra 7 258V achieves higher single-core scores due to its newer microarchitecture.

Cache configurations differ significantly. The Ultra 7 258V has 192 KB of L1 cache per core and 2.5 MB of L2 cache per core, while the i7-9700K has 64 KB of L1 and 256 KB of L2 per core. Both share 12 MB of L3 cache. The larger per-core L2 on the Ultra 7 258V likely contributes to its single-threaded advantages, while the i7-9700K's smaller L2 may explain its wins in random string sorting where higher base clocks matter.

Memory support is another differentiator. The Ultra 7 258V uses LPDDR5X with a memory bandwidth of 136.5 GB/s, while the i7-9700K uses DDR4 with 42.7 GB/s. This 3.2x bandwidth advantage for the Ultra 7 258V is reflected in its massive lead in PassMark data encryption and floating-point math. The i7-9700K supports PCIe Gen 3 with 16 lanes, while the Ultra 7 258V supports PCIe Gen 5 with only 4 lanes, reflecting its mobile focus versus the desktop-oriented i7-9700K.

The i7-9700K has an unlocked multiplier for overclocking, while the Ultra 7 258V is locked. The i7-9700K also has a larger die size of 180.3 mm² versus no die size listed for the Ultra 7 258V. Production status differs: the Ultra 7 258V is active, while the i7-9700K is end-of-life.

The Verdict

The data points to a clear generational shift. The Intel Core Ultra 7 258V is the better processor for most tasks, winning 15 of 19 head-to-head benchmarks. Its single-core dominance is overwhelming, with leads of 63.8% in Cinebench R15 single-core and 40.2% in PassMark single-thread. For users running modern productivity software, web browsing, or encryption-heavy workloads, the Ultra 7 258V offers substantially better performance per clock and per watt.

The Intel Core i7-9700K is not obsolete, however. Its win in Cinebench R23 multicore by 15.8% shows that in sustained all-core rendering, the older chip can still outperform the newer one. Its 15.1% lead in data compression and 18.6% lead in extended instructions indicate that certain legacy or specialized workloads still favor the higher-clocked desktop part. Users who rely on those specific tasks might prefer the i7-9700K, especially given its unlocked multiplier for overclocking.

However, the i7-9700K's 95W TDP versus the Ultra 7 258V's 17W TDP is a stark difference, though power figures are not part of the benchmark scoring. The Ultra 7 258V's mobile segment and active production status suggest it is the forward-looking choice, while the i7-9700K is end-of-life. The verdict: pick the Ultra 7 258V for general-purpose speed and efficiency, pick the i7-9700K only if specific workloads like compression or extended instruction sets dominate your usage.

FAQ

Q: Which processor is faster in single-core performance?

A: The Intel Core Ultra 7 258V is significantly faster, with a 63.8% lead in Cinebench R15 single-core (285 vs 174) and a 40.2% lead in PassMark single-thread (4018 vs 2865).

Q: Does the Intel Core i7-9700K win any benchmarks?

A: Yes, the i7-9700K wins 4 of 19 head-to-head tests, including Cinebench R23 multicore (12238 vs 10301, a 15.8% lead) and PassMark data compression (208062 vs 176686, a 15.1% lead).

Q: How do the cache sizes compare?

A: The Ultra 7 258V has 192 KB of L1 and 2.5 MB of L2 per core, while the i7-9700K has 64 KB of L1 and 256 KB of L2 per core. Both have 12 MB of shared L3 cache.

Q: What is the memory bandwidth difference?

A: The Ultra 7 258V supports LPDDR5X with 136.5 GB/s bandwidth, while the i7-9700K supports DDR4 with 42.7 GB/s. This is a 3.2x advantage for the Ultra 7 258V.

Q: Which processor has a higher boost clock?

A: The i7-9700K has a slightly higher boost clock at 4.90 GHz, compared to the Ultra 7 258V's 4.80 GHz. The i7-9700K also has a higher base clock at 3.60 GHz versus 2.20 GHz.

Q: Are both processors unlocked for overclocking?

A: No, only the Intel Core i7-9700K has an unlocked multiplier. The Intel Core Ultra 7 258V is locked.

Head-to-Head Benchmarks

The largest win for the Intel Core Ultra 7 258V is in PassMark find prime numbers, where it scores 185 versus the i7-9700K's 52, a 255.8% advantage. This test highlights the Ultra 7 258V's superior integer arithmetic and branch prediction. The second biggest win is in PassMark data encryption (13534 vs 4590, a 194.9% lead), which reflects the Ultra 7 258V's modern cryptographic instructions and higher memory bandwidth.

In Cinebench R15 single-core, the Ultra 7 258V scores 285 versus 174, a 63.8% lead. This is consistent with its PassMark single-thread win (4018 vs 2865, 40.2%). The Ultra 7 258V also wins PassMark physics by 77.8% (1565 vs 880) and PassMark floating-point math by 61.6% (57372 vs 35498), showing dominance in scientific and simulation workloads.

The Intel Core i7-9700K's biggest win is in Cinebench R23 multicore, where it scores 12238 versus 10301, a 15.8% lead. This is notable because the Ultra 7 258V wins other multicore tests like Cinebench R20 multicore (6739 vs 5139, a 31.1% lead) and Geekbench multicore (9325 vs 7799, a 19.6% lead). The i7-9700K's R23 result suggests that in this specific long-duration render, its higher sustained clocks matter more.

Another i7-9700K win is PassMark extended instructions (18088 vs 14717, an 18.6% lead) and PassMark random string sorting (25756 vs 21580, a 16.2% lead). These wins, combined with data compression (208062 vs 176686, a 15.1% lead), point to the i7-9700K's strength in data manipulation tasks that benefit from its higher base clock and different cache latency characteristics.

In Cinebench R15 multicore, the Ultra 7 258V wins by 29.5% (1596.5 vs 1233), and in Cinebench R20 multicore by 31.1% (6739 vs 5139). The Ultra 7 258V also wins Cinebench R23 single-core by 8.4% (1872 vs 1727) and Geekbench single-core by 28.1% (2100 vs 1639). These results show that the Ultra 7 258V is consistently faster in single-threaded and most multi-threaded tests, except the specific R23 multicore case.

Specification Differences

The two processors differ in nearly every major specification. The Intel Core Ultra 7 258V uses a 3 nm process from TSMC, while the Intel Core i7-9700K uses a 14 nm process from Intel. The Ultra 7 258V has a base clock of 2.20 GHz and boost clock of 4.80 GHz; the i7-9700K has a base clock of 3.60 GHz and boost clock of 4.90 GHz. TDP is drastically different: 17W for the Ultra 7 258V versus 95W for the i7-9700K.

Sockets differ completely: the Ultra 7 258V uses Intel BGA 2833 (mobile), while the i7-9700K uses Intel Socket 1151 (desktop). The Ultra 7 258V has 192 KB L1 and 2.5 MB L2 per core, versus 64 KB L1 and 256 KB L2 per core for the i7-9700K. Both have 12 MB shared L3 cache. Memory support is LPDDR5X for the Ultra 7 258V and DDR4 for the i7-9700K, with bandwidth of 136.5 GB/s versus 42.7 GB/s.

PCIe support differs: the Ultra 7 258V has Gen 5 with 4 lanes, while the i7-9700K has Gen 3 with 16 lanes. Integrated graphics are Arc 140V for the Ultra 7 258V and UHD Graphics 630 for the i7-9700K. The Ultra 7 258V is a mobile part, while the i7-9700K is desktop. Production status is active for the Ultra 7 258V and end-of-life for the i7-9700K. The i7-9700K has an unlocked multiplier and a launch MSRP of $385, while the Ultra 7 258V has no listed launch MSRP and is locked. The die size is 180.3 mm² for the i7-9700K; no die size is listed for the Ultra 7 258V.