Intel Core Ultra 9 285 vs Intel Core Ultra 9 285K Comparison

FAQ

Q: Which processor has the higher average benchmark score?

A: The Intel Core Ultra 9 285K records an average benchmark score of 83807, while the Intel Core Ultra 9 285 scores 75488. The 285K sits in the 96th percentile of all CPUs, one point above the 285's 95th percentile.

Q: How do the two chips compare on core and thread counts?

A: Both processors feature 24 cores and 24 threads. They share identical cache layouts: 192 KB of L1 per core, 3 MB of L2 per core, and 36 MB of shared L3 cache.

Q: What is the difference in power targets?

A: The Intel Core Ultra 9 285 has a TDP of 65, while the Intel Core Ultra 9 285K has a TDP of 125. The 285K also has a higher base clock of 3.70 GHz versus 2.50 GHz on the 285, and a slightly higher boost clock of 5.70 GHz versus 5.60 GHz.

Q: Which processor wins more head-to-head benchmark comparisons?

A: The Intel Core Ultra 9 285K wins 14 of the 17 recorded head-to-head tests. The Intel Core Ultra 9 285 wins 3 tests, including two Cinebench single-core tests and the Cinebench R23 multi-core test.

Q: Are these processors unlocked for overclocking?

A: The Intel Core Ultra 9 285K has an unlocked multiplier, while the Intel Core Ultra 9 285 does not. The part numbers differ as SRQD5 for the 285K and SRQD4 for the 285.

Q: What memory and expansion features do both share?

A: Both support DDR5 memory in a dual-channel configuration with 102.4 GB/s bandwidth. Both include ECC memory support, PCIe Gen 5 with 20 CPU lanes, and the integrated Arc Xe-LPG Graphics 64EU.

Architecture Differences

The Intel Core Ultra 9 285 and Intel Core Ultra 9 285K share the same fundamental architecture. Both are built on the Arrow Lake-S design using the Arrow Lake architecture, fabricated on a 3 nm process at TSMC. The transistor count is identical at 17,800 million, and the die size matches at 243 mm². Both use the Intel Socket 1851 and belong to the Core Ultra Series 2 generation.

The core configuration does not differ: 24 cores and 24 threads on both parts, with matching cache hierarchies. L1 cache sits at 192 KB per core, L2 at 3 MB per core, and L3 at 36 MB shared across the chip. The integrated graphics solution is also identical, with Arc Xe-LPG Graphics 64EU on both processors.

The meaningful architectural difference lies in clock behavior and power delivery. The 285K starts from a base clock of 3.70 GHz and boosts to 5.70 GHz, while the 285 starts lower at 2.50 GHz and boosts to 5.60 GHz. This 0.1 GHz boost difference is small, but the base clock gap of 1.2 GHz is substantial. The 285K carries a TDP of 125, nearly double the 285's 65 TDP, which suggests the 285K is designed to sustain higher sustained clock rates under load.

The unlocking status also separates these two parts. The 285K features an unlocked multiplier, allowing manual frequency adjustment. The 285 is locked, meaning its clock behavior is fixed by firmware. Both chips are active production parts from Intel, with the 285K released earlier on 2024-10-23 and the 285 following on 2024-12-31.

Head-to-Head Benchmarks

The recorded head-to-head data shows a clear overall winner, but the individual tests reveal a more nuanced picture. The Intel Core Ultra 9 285K dominates the majority of workloads, yet the 285 claims the most dramatic single-test victory.

The largest win for the 285 appears in Cinebench R23 single-core, where it scores 6909 against the 285K's 2377. That represents a 190.7% lead, the widest margin in the entire comparison. The 285 also wins Cinebench R15 single-core with 696 versus 359, a 93.9% advantage. In Cinebench R23 multi-core, the 285 posts 48945 against 42522, a 15.1% lead.

The 285K responds with consistent wins across nearly every other test. In Cinebench R15 multi-core, it scores 6494 against 4933, a 24% lead. Cinebench R20 shows the 285K ahead in both multi-core (24003 versus 20556, a 14.4% lead) and single-core (3388 versus 2901, also 14.4%). The pattern continues in Passmark tests: data compression favors the 285K by 23.8% (790052 versus 602121), extended instructions by 27.2% (62277 versus 45357), and random string sorting by 22.4% (94927 versus 73651).

Several Passmark results show smaller but still consistent margins for the 285K. Data encryption lands at 57745 versus 46949, an 18.7% edge. Find prime numbers scores 541 versus 459, a 15.2% lead. Floating point math reaches 224324 against 194988, a 13.1% difference. Multithread performance records 67260 versus 56602, a 15.8% gap. Physics tests show 3938 versus 3598, an 8.6% lead. The closest margin appears in integer math, where the 285K scores 172379 against 164869, just 4.4% ahead. Single-thread Passmark results also go to the 285K at 5087 versus 4881, a 4% edge.

The 285K's average benchmark score of 83807 places it 0.2% behind the Intel Core Ultra 9 290K Plus, its closest rival, and 0.9% ahead of the AMD EPYC 4584PX. The 285's average score of 75488 puts it 0.1% behind the AMD EPYC 8224P and 0.2% ahead of the AMD EPYC 4545P.

The Verdict

The data indicates that the Intel Core Ultra 9 285K is the faster processor in most measurable scenarios. Its 14 wins against 3 in the head-to-head suite, combined with the higher average benchmark score of 83807 versus 75488, make it the stronger choice for users prioritizing raw throughput. The 285K's higher base clock of 3.70 GHz and boost clock of 5.70 GHz, along with its 125 TDP, align with its dominant multi-core results.

The Intel Core Ultra 9 285, however, holds specific advantages that matter in select workloads. Its Cinebench R23 single-core score of 6909 is more than double the 285K's result, and the R15 single-core score of 696 nearly doubles the 285K's 359. The 285 also wins Cinebench R23 multi-core with 48945, suggesting that under certain rendering conditions, it can outperform the 285K despite the latter's higher average.

For users who need maximum sustained multi-threaded performance across diverse applications, the 285K is the data-supported pick. For those whose workloads align with the specific Cinebench tests where the 285 excels, particularly single-core rendering, the 285 offers a compelling alternative. The 285K also carries the unlocked multiplier, enabling manual tuning that the locked 285 cannot match. The 285's lower TDP of 65 may appeal to systems with tighter power constraints, but the benchmark record shows that constraint comes with a measurable performance cost.

Specification Differences

The two processors differ on several recorded specifications:

• Base Clock: The 285 runs at 2.50 GHz, the 285K at 3.70 GHz.
• Boost Clock: The 285 reaches 5.60 GHz, the 285K reaches 5.70 GHz.
• TDP: The 285 has a TDP of 65, the 285K has a TDP of 125.
• Multiplier: The 285 is locked, the 285K is unlocked.
• Part Number: The 285 is SRQD4, the 285K is SRQD5.
• Release Date: The 285 launched on 2024-12-31, the 285K launched on 2024-10-23.
• Launch MSRP: The 285 has a launch MSRP of $579, the 285K has a launch MSRP of $589.

All other recorded specifications are identical: 24 cores, 24 threads, 3 nm process, 17,800 million transistors, 243 mm² die size, 192 KB L1 per core, 3 MB L2 per core, 36 MB L3 shared, DDR5 dual-channel memory, 102.4 GB/s bandwidth, ECC support, PCIe Gen 5 with 20 CPU lanes, Arc Xe-LPG Graphics 64EU, and Intel Socket 1851.

Where Each One Wins

The Intel Core Ultra 9 285K wins in the broad majority of recorded workloads. Its Passmark results cover data compression, data encryption, extended instructions, prime number finding, floating point math, integer math, multithread performance, physics, random string sorting, and single-thread performance. It also takes Cinebench R15 multi-core and both Cinebench R20 tests. This breadth makes it the default choice for general computing, content creation, scientific calculations, and any workload that exercises the full processor.

The Intel Core Ultra 9 285 wins in three specific tests: Cinebench R15 single-core, Cinebench R23 single-core, and Cinebench R23 multi-core. The single-core Cinebench victories are so large that they suggest a fundamentally different performance profile in that specific benchmark. The 190.7% lead in R23 single-core and the 93.9% lead in R15 single-core are not marginal differences. The R23 multi-core win of 15.1% further indicates that the 285 can outperform the 285K in certain Cinebench rendering scenarios, despite losing Cinebench R15 and R20 multi-core tests.

The data supports a practical split: the 285K for users who run varied, multi-threaded applications and want the highest overall average performance, and the 285 for users whose primary workload matches Cinebench's rendering engine, where it demonstrates exceptional single-core results and a multi-core edge in R23. The 285's lower TDP also makes it suitable for power-conscious builds, though the benchmark record shows that trade-off reduces performance in most other tests.