AMD Ryzen 7 8840HX vs AMD Ryzen 7 PRO 9755 Comparison
AMD Ryzen 7 8840HX
Ryzen 7 PRO 9755
PERFORMANCE BENCHMARKS
Analysis: AMD Ryzen 7 8840HX vs AMD Ryzen 7 PRO 9755
The Verdict
The benchmark data presents a clear split between these two AMD processors. The AMD Ryzen 7 PRO 9755 wins the single-thread and extended instruction tests, while the AMD Ryzen 7 8840HX dominates the multi-threaded and throughput-oriented workloads. With 4 wins for the PRO 9755 and 7 wins for the 8840HX, the mobile chip takes the majority of head-to-head comparisons. However, the nature of those wins matters. The PRO 9755's 16.4% lead in single-thread performance is substantial, while the 8840HX's largest victory comes in data encryption at 24.5%. The desktop-oriented PRO 9755 is the choice for tasks that rely on raw per-core speed and advanced instruction efficiency. The 8840HX, with its 12 cores and 24 threads, is better suited for parallel workloads like data compression, integer math, and random string sorting. The PRO 9755 sits at the 95th percentile of all CPUs, while the 8840HX sits at the 94th, meaning both are elite performers, but the data suggests the 8840HX offers broader multi-threaded capability despite its lower boost clock and higher process node size.
Architecture Differences
The two processors come from different architectural generations. The PRO 9755 is built on the Zen 5 (Granite Ridge) architecture with a 4 nm process node from TSMC, while the 8840HX uses the older Zen 4 (Dragon Range) design on a 5 nm node. The core counts diverge significantly: the PRO 9755 has 8 cores and 16 threads, while the 8840HX has 12 cores and 24 threads. This 50% increase in core count explains much of the multi-threaded performance gap.
Cache configurations differ notably. The PRO 9755 offers 80 KB of L1 cache per core, 1 MB of L2 per core, and 32 MB of shared L3 cache. The 8840HX provides 64 KB of L1 per core, the same 1 MB of L2 per core, but doubles the L3 to 64 MB shared. The transistor counts are also distinct: the PRO 9755 packs 8,315 million transistors on a 70.6 mm² die, while the 8840HX uses 13,140 million transistors across two 71 mm² dies. The 8840HX is a dual-die design, which likely contributes to its higher power efficiency at 55 W TDP, compared to the PRO 9755's 120 W TDP. Memory support is DDR5 for both, but the PRO 9755 has a higher theoretical bandwidth at 89.6 GB/s versus 83.2 GB/s for the 8840HX. ECC memory support is present only on the PRO 9755, reflecting its server/workstation market segment. The 8840HX targets mobile platforms with its FL1 socket, while the PRO 9755 uses the AM5 socket.
Head-to-Head Benchmarks
The single-thread test shows the PRO 9755's clear advantage. It scores 4606 against 3958 for the 8840HX, a 16.4% lead. This aligns with the PRO 9755's higher boost clock of 5.40 GHz versus 5.10 GHz. The extended instructions test also favors the PRO 9755 with a score of 38976 versus 36527, a 6.7% margin. Physics simulation goes slightly to the PRO 9755 as well, with 2257 versus 2185, a 3.3% edge.
The 8840HX counters with decisive wins in nearly every throughput metric. Data compression shows 496427 versus 467988, a 5.7% difference. Data encryption results are more lopsided: 29919 versus 22577, giving the 8840HX a 24.5% advantage. Prime number finding favors the 8840HX heavily at 304 versus 197, a 35.2% gap. Floating point math shows 86747 versus 81456, a 6.1% lead for the 8840HX. Integer math produces 146506 versus 122411, a 16.4% margin. The multithread score goes to the 8840HX at 41732 versus 38721, a 7.2% difference. Random string sorting also favors the 8840HX: 57971 versus 49326, a 14.9% gap.
The pattern is consistent. The PRO 9755 wins where per-core efficiency and clock speed matter most. The 8840HX wins where additional cores can be utilized. The data suggests the 8840HX's extra 4 cores and 8 threads overcome the PRO 9755's architectural improvements in most parallel workloads.
FAQ
Q: Which processor has a higher single-thread benchmark score?
A: The AMD Ryzen 7 PRO 9755 achieves a score of 4606 in the passmark single-thread test, which is 16.4% higher than the AMD Ryzen 7 8840HX's score of 3958.
Q: What is the largest performance gap between these two CPUs?
A: The biggest difference appears in the find prime numbers test, where the AMD Ryzen 7 8840HX scores 304 versus the PRO 9755's 197, a 35.2% advantage for the mobile processor.
Q: Do both processors support ECC memory?
A: No. The AMD Ryzen 7 PRO 9755 supports ECC memory, while the AMD Ryzen 7 8840HX does not include ECC support.
Q: Which CPU has more cores and threads?
A: The AMD Ryzen 7 8840HX has 12 cores and 24 threads, while the AMD Ryzen 7 PRO 9755 has 8 cores and 16 threads.
Q: How do the TDP ratings compare?
A: The AMD Ryzen 7 PRO 9755 has a TDP of 120 W, while the AMD Ryzen 7 8840HX has a TDP of 55 W, meaning the mobile chip is designed for significantly lower power consumption.
Q: What is the cache difference between the two?
A: The PRO 9755 has 32 MB of shared L3 cache, while the 8840HX has 64 MB of shared L3 cache. L1 cache is 80 KB per core on the PRO 9755 versus 64 KB per core on the 8840HX, with both having 1 MB of L2 per core.
Where Each One Wins
The AMD Ryzen 7 PRO 9755 is the clear choice for single-threaded performance. Its 16.4% lead in the passmark single-thread test makes it stronger for applications that depend on clock speed and per-core efficiency, such as legacy software, certain simulation workloads, and tasks where the main thread dominates. The extended instructions win of 6.7% suggests better handling of advanced instruction sets, which can matter for specific scientific or encryption-related code paths. The physics test win of 3.3% hints at better performance in physics calculations, possibly due to the newer Zen 5 architecture. The PRO 9755 also holds the edge in memory bandwidth at 89.6 GB/s versus 83.2 GB/s, which can benefit memory-intensive single-threaded tasks.
The AMD Ryzen 7 8840HX wins in most parallel workloads. The 24.5% lead in data encryption is notable for anyone handling encrypted data streams. The 35.2% advantage in prime number finding indicates strong integer arithmetic capabilities when multiple cores are engaged. Integer math at 16.4% ahead and floating point math at 6.1% ahead show broad multi-threaded superiority. Data compression at 5.7% ahead and random string sorting at 14.9% ahead make the 8840HX better suited for database operations, file compression, and sorting algorithms. The multithread score at 7.2% ahead reinforces this trend. The 8840HX also offers an unlocked multiplier, allowing overclocking, which the PRO 9755 does not provide. Its 28 PCIe Gen 5 lanes surpass the PRO 9755's 24 lanes, which could matter for expandability in mobile workstations. The 8840HX also includes the Radeon 610M integrated graphics, while the PRO 9755 has a Radeon Graphics solution without a specific model name.
Specification Differences
The two processors differ across several key specification fields. The PRO 9755 uses the Granite Ridge codename with Zen 5 architecture, while the 8840HX uses Dragon Range with Zen 4 architecture. The process node is 4 nm for the PRO 9755 versus 5 nm for the 8840HX. Core counts differ at 8 versus 12, and threads at 16 versus 24. Base clocks are 3.80 GHz for the PRO 9755 and 2.90 GHz for the 8840HX, while boost clocks are 5.40 GHz and 5.10 GHz respectively. TDP is 120 W versus 55 W. The PRO 9755 uses the AMD Socket AM5, while the 8840HX uses the AMD Socket FL1. Transistor counts are 8,315 million versus 13,140 million. Die size is 70.6 mm² for the PRO 9755 versus 2x 71 mm² for the 8840HX. L1 cache is 80 KB per core versus 64 KB per core, while L3 cache is 32 MB shared versus 64 MB shared. Memory bandwidth is 89.6 GB/s versus 83.2 GB/s. ECC memory support is present only on the PRO 9755. PCIe lanes are 24 for the PRO 9755 versus 28 for the 8840HX. The integrated graphics are listed as Radeon Graphics for the PRO 9755 and Radeon 610M for the 8840HX. Market segments differ: server/workstation for the PRO 9755 versus mobile for the 8840HX. The multiplier is locked on the PRO 9755 and unlocked on the 8840HX. Release dates are 2026-06-29 for the PRO 9755 and 2025-04-22 for the 8840HX. The PRO 9755 has a part number of 100-000001969, while the 8840HX uses 100-000001850.