Intel Core Ultra 5 225T vs Intel Core Ultra 9 285HX Comparison

Head-to-Head Benchmarks

The benchmark comparison between the Intel Core Ultra 5 225T and the Intel Core Ultra 9 285HX is overwhelmingly one-sided. Of the 17 recorded head-to-head tests, the Core Ultra 9 285HX claims 16 wins, while the Core Ultra 5 225T secures a single victory. The average benchmark scores reinforce this gap: the Ultra 9 285HX posts an average of 76155, versus 30468 for the Ultra 5 225T, placing the former in the 95th percentile of all CPUs and the latter in the 82nd percentile.

The largest advantage for the Core Ultra 9 285HX appears in PassMark data compression, where it scores 631885 against 233998, a delta of 63%. Integer math shows a similar pattern, with the Ultra 9 delivering 155076 versus 59543, a 61.6% advantage. The multithreaded PassMark score of 56902 compared to 25358 represents a 55.4% lead, while floating point math shows the Ultra 9 at 194998 against 82751, a 57.6% edge. Random string sorting favors the Ultra 9 by 62.7% (77196 versus 28774), and data encryption shows a 62.3% gap (48567 versus 18289).

Cinebench multicore results tell the same story. In Cinebench R15 multicore, the Ultra 9 scores 5656.5 against 2214, a 60.9% difference. Cinebench R20 multicore shows 20236 versus 9227, a 54.4% gap, and Cinebench R23 multicore records 36429.5 against 21971, a 39.7% margin. The Ultra 9 also wins PassMark physics (3476 versus 2053, 40.9%), extended instructions (49148 versus 20083, 59.1%), and prime number finding (460 versus 284, 38.3%).

The single exception is Cinebench R23 single-core, where the Ultra 5 225T wins with a score of 3101 against 2187.5, a 41.8% advantage. This is a substantial outlier. The Ultra 9 still edges ahead in Cinebench R15 single-core (323.5 versus 312, a 3.6% margin) and Cinebench R20 single-core (2856 versus 1302, a 54.4% margin), and in PassMark single-thread tests (4618 versus 4348, a 5.8% margin). The R23 single-core result suggests the Ultra 5 225T can sustain higher single-thread performance under certain conditions, but it does not carry over to other single-threaded workloads in the dataset.

Architecture Differences

Both processors belong to the Core Ultra Series 2 and share the same Arrow Lake architecture, manufactured by TSMC on a 3 nm process node. Both integrate 17,800 million transistors on a 243 mm² die. The fundamental difference lies in core configuration and packaging. The Ultra 5 225T is a desktop part on Intel Socket 1851, while the Ultra 9 285HX is a mobile processor on Intel BGA 2114. The Ultra 5 225T uses Arrow Lake-S, and the Ultra 9 285HX uses Arrow Lake-HX.

Core counts diverge sharply. The Ultra 5 225T has 10 cores and 10 threads, while the Ultra 9 285HX has 24 cores and 24 threads. Neither processor uses simultaneous multithreading. The Ultra 9's additional 14 cores directly explain its dominance in multicore and heavily threaded workloads. Clock speeds also differ: the Ultra 5 225T has a base clock of 2.50 GHz and a boost clock of 4.90 GHz, whereas the Ultra 9 285HX runs at 2.80 GHz base and 5.50 GHz boost. The Ultra 9's higher base and boost clocks contribute to its advantage in most single-threaded tests, though the R23 single-core result runs contrary to that trend.

Cache hierarchies are identical in L1 and L2 sizing: both provide 192 KB of L1 per core and 3 MB of L2 per core. The shared L3 cache differs substantially, with the Ultra 5 225T carrying 20 MB and the Ultra 9 285HX carrying 36 MB. This 16 MB difference in shared cache gives the Ultra 9 more room for frequently accessed data across its larger core count. Both processors support DDR5 memory over a dual-channel bus with a memory bandwidth of 102.4 GB/s. ECC memory support splits the pair: the Ultra 5 225T does not support ECC, while the Ultra 9 285HX does.

Integrated graphics differ as well. The Ultra 5 225T uses Arc Xe-LPG Graphics with 16 execution units, while the Ultra 9 285HX uses Arc Xe-LPG Graphics with 64 execution units, a fourfold increase in EU count. PCIe connectivity is identical on paper: Gen 5 with 20 lanes from the CPU. The Ultra 9 285HX has an unlocked multiplier, whereas the Ultra 5 225T does not, which allows manual overclocking on the mobile part. The Ultra 9 285HX also has a known part number (SRVFJ), while the Ultra 5 225T's part number is listed as unknown. Release dates place the Ultra 5 225T at the end of 2024 and the Ultra 9 285HX in January 2025.

Where Each One Wins

The Core Ultra 9 285HX is the clear choice for multithreaded throughput. Its 24 cores and 24 threads, combined with 36 MB of L3 cache, produce decisive wins across Cinebench multicore tests and every PassMark multithreaded workload. Data compression, encryption, integer math, floating point math, extended instructions, and random string sorting all favor the Ultra 9 by margins between 38.3% and 63%. The higher boost clock of 5.50 GHz also gives it an edge in most single-threaded tests, although the margin there is much smaller (3.6% to 5.8% in most cases, with a notable exception in R20 single-core at 54.4%).

The Core Ultra 5 225T wins only one recorded test: Cinebench R23 single-core. Its score of 3101 versus 2187.5 represents a 41.8% lead over the Ultra 9. This single result suggests that in specific single-threaded rendering scenarios, the Ultra 5 225T can outperform the Ultra 9 despite its lower boost clock. However, this does not generalize across other single-threaded benchmarks, where the Ultra 9 leads. The Ultra 5 225T also carries a lower thermal design power of 65 W versus 55 W for the Ultra 9, which is notable given the Ultra 9's far larger core count; the mobile part delivers roughly 2.5 times the average benchmark score while drawing 10 W less. The Ultra 5 225T remains a desktop part with a socketed form factor, while the Ultra 9 285HX is a mobile BGA part, so the two target different physical platforms despite their shared architecture fundamentals.

The Ultra 5 225T sits in the 82nd percentile of all CPUs, with nearest rivals including the Intel Core i9-11980HK (0.2% ahead), AMD Ryzen 5 7640HS (0.3% ahead), AMD Ryzen 7 7736U (0.3% ahead), and Intel Core i5-13600H (0.3% behind). The Ultra 9 285HX occupies the 95th percentile, with nearest rivals including the AMD Ryzen 9 8945HX (0.1% ahead), AMD EPYC Embedded 8224P (0.4% ahead), AMD Ryzen Threadripper PRO 9945WX (0.5% ahead), and AMD Ryzen 9 9950X3D (0.5% behind). The competitive positioning confirms that the Ultra 9 operates in a higher performance tier entirely.

FAQ

Q: Which processor has more cores?

A: The Intel Core Ultra 9 285HX has 24 cores and 24 threads, while the Intel Core Ultra 5 225T has 10 cores and 10 threads.

Q: How large is the performance gap in multithreaded workloads?

A: The Ultra 9 285HX leads by 60.9% in Cinebench R15 multicore, 54.4% in Cinebench R20 multicore, 39.7% in Cinebench R23 multicore, and 55.4% in PassMark multithread tests.

Q: Does the Ultra 5 225T win any benchmarks?

A: Yes, it wins Cinebench R23 single-core with a score of 3101, a 41.8% advantage over the Ultra 9 285HX's 2187.5.

Q: Do the two processors use the same manufacturing process?

A: Both are built on a 3 nm process by TSMC, with 17,800 million transistors on a 243 mm² die.

Q: What is the difference in L3 cache?

A: The Ultra 5 225T has 20 MB of shared L3 cache, while the Ultra 9 285HX has 36 MB.

Q: Which processor supports ECC memory?

A: The Ultra 9 285HX supports ECC memory, while the Ultra 5 225T does not.

Specification Differences

| Specification | Intel Core Ultra 5 225T | Intel Core Ultra 9 285HX |

|----------------------|-------------------------|--------------------------|

| Cores | 10 | 24 |

| Threads | 10 | 24 |

| Base Clock | 2.50 GHz | 2.80 GHz |

| Boost Clock | 4.90 GHz | 5.50 GHz |

| TDP | 65 W | 55 W |

| Socket | Intel Socket 1851 | Intel BGA 2114 |

| Codename | Arrow Lake-S | Arrow Lake-HX |

| Generation | Ultra 5 (Arrow Lake) | Ultra 9 (Arrow Lake-HX) |

| L3 Cache | 20 MB (shared) | 36 MB (shared) |

| ECC Memory | No | Yes |

| Integrated Graphics | Arc Xe-LPG Graphics 16EU | Arc Xe-LPG Graphics 64EU |

| Market Segment | Desktop | Mobile |

| Release Date | 2024-12-31 | 2025-01-12 |

| Multiplier Unlocked | No | Yes |

| Part Number | unknown | SRVFJ |

| Average Benchmark Score | 30468 | 76155 |

| Percentile vs All CPUs | 82 | 95 |

| Cinebench R23 Single-core | 3101 | 2187.5 |

| Cinebench R23 Multicore | 21971 | 36429.5 |

| PassMark Single-thread | 4348 | 4618 |

| PassMark Multithread | 25358 | 56902 |

The two processors share several attributes: both are Core Ultra Series 2 parts, both use Arrow Lake architecture, both are built on TSMC's 3 nm process, both have 17,800 million transistors, both use a 243 mm² die, both have 192 KB L1 cache per core, both have 3 MB L2 cache per core, both support DDR5 memory, both use a dual-channel memory bus, both have 102.4 GB/s memory bandwidth, both use PCIe Gen 5 with 20 CPU lanes, and both are active in production. The differences above represent every field where the two diverge in the recorded data.