AMD Ryzen 9 9900X vs Intel Core Ultra 5 245KF Comparison

Head-to-Head Benchmarks

The head-to-head data presents a fascinating split personality. The AMD Ryzen 9 9900X takes the overall win count, securing 9 victories out of 15 shared tests, while the Intel Core Ultra 5 245KF claims 6. However, the magnitude of those wins tells a more nuanced story than the raw tally suggests.

Starting with the AMD side, the most striking result is in PassMark integer math, where the Ryzen 9 9900X posts a score of 181,056 against Intel's 98,854, a commanding 83.2% advantage. This is the largest delta in the entire comparison and indicates a fundamental throughput advantage in pure integer workloads. Data compression follows a similar pattern, with AMD scoring 683,579 versus 460,123, a 48.6% lead. Extended instructions also favor AMD heavily, 55,243 to 37,912, a 45.7% gap. These three tests alone paint a picture of a processor that excels in compute-heavy, data-processing scenarios.

The multi-threaded PassMark test reinforces this narrative, with AMD at 54,643 versus Intel's 43,110, a 26.8% win. Random string sorting goes to AMD as well, 72,013 to 55,206, a 30.4% advantage. Even the more niche tests favor AMD: find prime numbers shows a 4.8% lead (436 to 416), and physics simulation shows a 12.8% edge (3,381 to 2,998). The data encryption test is essentially a tie, with AMD winning by a razor-thin 0.1% (33,421 to 33,381).

Now for the Intel side, and this is where the data gets interesting. The Cinebench R23 multi-core test goes to Intel, 36,647 to 32,172, a 12.2% win. This is notable because it contradicts the PassMark multi-thread result, suggesting that different workload characteristics produce different winners. Intel also dominates the single-core Cinebench tests with staggering margins. In Cinebench R23 single-core, Intel scores 5,173 versus AMD's 2,253, an enormous 56.4% lead. The R15 single-core test shows a similar story: 521 versus 353, a 32.2% gap. These are not small differences; they represent a fundamental architectural advantage in lightly-threaded, latency-sensitive work.

Floating point math also goes to Intel, 131,546 to 120,083, an 8.7% win. The PassMark single-thread tests are nearly identical, with Intel scoring 4,715 versus AMD's 4,672, a marginal 0.9% lead. Interestingly, the Cinebench R15 multi-core test is a decisive AMD win, 5,008 to 3,693, a 35.6% advantage, which contrasts sharply with the R23 multi-core result where Intel wins. This discrepancy between benchmark generations suggests that the two processors have very different scaling behaviors as thread counts and instruction mixes change.

Architecture Differences

The architectural gulf between these two chips is substantial. The AMD Ryzen 9 9900X is built on TSMC's 4 nm process and uses the Zen 5 architecture, codenamed Granite Ridge. It packs 12 cores and 24 threads, leveraging simultaneous multithreading to double its thread count. The Intel Core Ultra 5 245KF, by contrast, uses a 3 nm process from the same foundry, employs the Arrow Lake architecture, and offers 14 cores but only 14 threads, with no multithreading enabled.

Cache hierarchies diverge significantly. AMD configures 80 KB of L1 per core, 1 MB of L2 per core, and a substantial 64 MB of L3 cache. Intel's design uses 192 KB of L1 per core, 3 MB of L2 per core, but only 24 MB of shared L3. The L2 per-core difference is striking: Intel's 3 MB versus AMD's 1 MB shows a different caching philosophy, with Intel favoring larger per-core private caches while AMD relies on a much larger shared L3 pool.

Clock speeds favor AMD on paper, with a 4.40 GHz base and 5.60 GHz boost versus Intel's 4.20 GHz base and 5.20 GHz boost. However, the benchmark data reveals that Intel still manages to win the single-threaded Cinebench tests by wide margins, indicating that raw clock speed is not the sole determinant of single-core performance. Power envelopes are close, with AMD rated at 120 W TDP and Intel at 125 W TDP.

The transistor counts are similar in magnitude, with AMD at 16,630 million and Intel at 17,800 million, but the die sizes tell a different story. AMD uses a chiplet design with two 70.6 mm² dies, while Intel uses a monolithic 243 mm² die. Memory support is DDR5 for both, with dual-channel buses. AMD's memory bandwidth is rated at 89.6 GB/s, while Intel claims 102.4 GB/s. AMD supports ECC memory while Intel does not. PCIe connectivity also differs, with AMD offering Gen 5 across 24 CPU lanes versus Intel's Gen 5 across 20 lanes. Notably, AMD includes integrated Radeon Graphics while the Intel 245KF has no integrated graphics at all.

The Verdict

The recorded data supports a clear division of labor. The AMD Ryzen 9 9900X is the choice for integer-heavy, multi-threaded, and data-processing workloads. Its 83.2% lead in integer math and 48.6% lead in data compression are decisive, and its 26.8% multi-thread PassMark advantage reinforces this profile. The 35.6% win in Cinebench R15 multi-core adds further weight. For users whose workloads involve compression, encryption-adjacent processing, extended instruction sets, prime number calculations, physics simulation, or random string sorting, the AMD part is the data-backed winner.

The Intel Core Ultra 5 245KF, on the other hand, is the choice for single-threaded performance and floating-point math. The 56.4% lead in Cinebench R23 single-core and 32.2% lead in R15 single-core are massive, and the 8.7% win in floating-point math rounds out its profile. The 12.2% win in Cinebench R23 multi-core also cannot be ignored, suggesting that in certain modern multi-threaded rendering workloads, Intel's architecture holds an advantage despite its lack of multithreading.

Neither processor is a universal winner. The data indicates that workload character matters more than core count or thread count alone. The Intel chip's 14 cores without multithreading outperform AMD's 12 cores with 24 threads in some multi-threaded tests, but fall far behind in others. Users should match the processor to their dominant workload type rather than relying on specifications alone.

FAQ

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

A: The AMD Ryzen 9 9900X wins 9 of the 15 shared head-to-head tests, while the Intel Core Ultra 5 245KF wins 6.

Q: How large is the single-thread performance gap?

A: In Cinebench R23 single-core, the Intel Core Ultra 5 245KF scores 5,173 versus AMD's 2,253, a 56.4% advantage. The R15 single-core test shows a 32.2% gap in Intel's favor.

Q: Which processor has better multi-threaded performance?

A: It depends on the benchmark. AMD wins PassMark multi-thread by 26.8% and Cinebench R15 multi-core by 35.6%, but Intel wins Cinebench R23 multi-core by 12.2%.

Q: What are the core and thread counts?

A: The AMD Ryzen 9 9900X has 12 cores and 24 threads. The Intel Core Ultra 5 245KF has 14 cores and 14 threads, with no multithreading.

Q: Do both processors support the same memory type?

A: Both support DDR5 memory with dual-channel buses. AMD has a memory bandwidth of 89.6 GB/s, while Intel has 102.4 GB/s. AMD supports ECC memory; Intel does not.

Q: Which processor has integrated graphics?

A: The AMD Ryzen 9 9900X includes Radeon Graphics. The Intel Core Ultra 5 245KF has no integrated graphics.

Where Each One Wins

For data compression and integer-heavy workloads, the AMD Ryzen 9 9900X is the clear choice. Its 48.6% lead in data compression and 83.2% lead in integer math make it the superior option for tasks like file archiving, database operations, and general-purpose compute. The 45.7% advantage in extended instructions further solidifies this position for workloads that leverage SIMD and specialized instruction sets.

For physics simulation and multi-threaded general workloads, AMD again takes the lead, with a 12.8% win in PassMark physics and a 26.8% win in PassMark multi-thread. The 35.6% Cinebench R15 multi-core win suggests AMD excels in older multi-threaded rendering workloads, while the 30.4% win in random string sorting indicates strength in text processing and data organization tasks.

For single-threaded applications and legacy software that cannot utilize many cores, the Intel Core Ultra 5 245KF is the data-backed choice. The 56.4% Cinebench R23 single-core lead and 32.2% R15 single-core lead are the largest margins in the entire comparison. This translates to snappier response in lightly-threaded applications, older games, and productivity tools that rely on single-core performance.

For floating-point math, Intel wins by 8.7%, making it the better choice for scientific computing and numerical analysis that relies heavily on FPU throughput. The near-tie in PassMark single-thread (0.9% Intel lead) suggests that for general single-threaded tasks, the two are almost indistinguishable, despite the massive Cinebench single-core differences.

For modern multi-threaded rendering workloads, the Cinebench R23 multi-core result gives Intel a 12.2% win, indicating that current-generation rendering engines may favor Intel's architecture. However, users running older rendering engines should note AMD's 35.6% R15 multi-core advantage.

Specification Differences

The two processors differ across nearly every major specification category. The AMD Ryzen 9 9900X uses the Zen 5 architecture and Granite Ridge codename, while the Intel Core Ultra 5 245KF uses the Arrow Lake architecture and Arrow Lake-S codename. AMD is built on a 4 nm process, while Intel uses a 3 nm process, both from TSMC.

Core configuration differs significantly: AMD has 12 cores and 24 threads, while Intel has 14 cores and 14 threads. Base clocks are 4.40 GHz for AMD and 4.20 GHz for Intel; boost clocks are 5.60 GHz for AMD and 5.20 GHz for Intel. TDP ratings are close, with AMD at 120 W and Intel at 125 W.

Cache structures diverge completely. AMD uses 80 KB of L1 per core, 1 MB of L2 per core, and 64 MB of L3. Intel uses 192 KB of L1 per core, 3 MB of L2 per core, and 24 MB of shared L3. Memory bandwidth favors Intel at 102.4 GB/s versus AMD's 89.6 GB/s, despite both using dual-channel DDR5. ECC support is present on AMD but absent on Intel.

PCIe connectivity favors AMD, with Gen 5 across 24 CPU lanes versus Intel's Gen 5 across 20 lanes. Integrated graphics are present on AMD (Radeon Graphics) but absent on Intel. The die size differs substantially, with AMD using two 70.6 mm² dies versus Intel's single 243 mm² die. Transistor counts are 16,630 million for AMD and 17,800 million for Intel. AMD's launch MSRP is $499, while Intel's launch MSRP is $294. Both processors have unlocked multipliers and are currently in active production.