Leaked benchmark hints at major Zen 6 performance leap over Zen 5

256-core EPYC 9996 posts single-threaded scores up to 24% higher than Ryzen 7 9700X at same clock speed

By LineZotpaper AI staff

Published26 October 2026

Read Time2 min

Illustration: Leaked benchmark hints at major Zen 6 performance leap over Zen 5

A leaked Geekbench 7 result for AMD's EPYC 9996, a 256-core server chip using the Zen 6c architecture, shows significant single-threaded performance improvements over a Zen 5 desktop processor when tested at the same clock speed, suggesting a potential double-digit IPC gain for the upcoming architecture.

A benchmark result for AMD's EPYC 9996, a server processor built on the company's new Zen 6c architecture, has appeared online, offering an early look at the performance of the next-generation core design. The chip, which packs 256 cores across eight CCDs and an enormous 1GB of L3 cache, was tested in Geekbench 7 and compared directly with a Ryzen 7 9700X Zen 5 desktop CPU.

The comparison, highlighted by leaker HXL and Russian enthusiast @326powah, matched the core clock rates of both processors at 4.1GHz to isolate architectural differences. Under Linux, the EPYC 9996 scored 2847 in the single-threaded test, while the Ryzen 7 9700X scored 2483 under the same operating system, a gain of roughly 15% overall.

Individual subtests showed larger gaps. The biggest difference was 24% in the HTML5 Browser test, a benchmark sensitive to memory latency, which may be aided by the server chip's massive cache. However, significant gains were also seen in asset compression (19%), video encoding (21%), and photo editing (17%), pointing to genuine architectural improvements rather than configuration differences alone.

The test results are notable because Geekbench makes relatively light use of SIMD instructions, meaning the gains likely come from better integer performance and memory subsystem design rather than raw floating-point or vector throughput. The EPYC 9996 tested is a Zen 6c part, a dense core variant optimised for area efficiency and low clock speeds. The consumer desktop version of Zen 6, expected to launch next year, will use a different core design that may achieve higher clock rates.

AMD's Zen 5 delivered a modest IPC uplift over Zen 4, and these leaked results suggest Zen 6 could offer a more substantial improvement. The EPYC 9996 is also rumoured to feature a 1024-bit memory bus and extremely high memory bandwidth, though this does not directly influence single-threaded benchmarks.

The results should be treated with caution, as the EPYC 9996's large L3 cache and other server-specific features may inflate performance in some tests. Nonetheless, they offer the first concrete indication of the architectural gains AMD has achieved with Zen 6.

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Analysis

Why This Matters

Early benchmarks suggest AMD's Zen 6 architecture may deliver a significant single-threaded performance uplift over Zen 5, potentially rivaling the largest generational leaps in recent CPU history.
If confirmed, Zen 6 desktop processors could drive a major upgrade cycle for PC enthusiasts and professionals, particularly in media encoding and content creation workloads.
The results highlight AMD's continued investment in cache-heavy designs, which provide measurable benefits in latency-sensitive tasks.

Background

AMD's Zen 5, launched in 2024, offered a relatively modest IPC improvement over Zen 4 and disappointed some desktop users. The company has been developing its successor, Zen 6, on an advanced manufacturing process. While server-grade chips are typically the first to ship, the architecture is confirmed to be coming to the AM5 desktop platform. The leaked EPYC 9996 represents the high-density "c" variant of the core; the standard desktop cores are expected to be clocked higher.

What to Watch

Official independent benchmarks of EPYC 9006-series chips once retail availability increases.
Desktop Zen 6 product announcements and performance comparisons using standard rather than dense cores.
Confirmation of clock speed targets and real-world IPC gains in applications outside synthetic benchmarks like Geekbench.

Sources

Leaked 256-core Zen 6c EPYC CPU destroys Zen 5 in early single-threaded benchmarks hints at 24% IPC gain · Tom's Hardware

Checked

12 claims in this story checked against 1 source: 11 supported.

Show each claim

SupportedThe leaked result hints at a major Zen 6 performance leap over Zen 5.Latest from Tom's Hardware: “Zen 6 seemingly may have a significant IPC advantage”
SupportedThe EPYC 9996’s single-threaded score is up to 24% higher than the Ryzen 7 9700X’s at the same clock speed.Latest from Tom's Hardware: “Matching the CPU core clock rates at 4.1 GHz actually gives us a pretty decent core-to-core comparison of performance”
SupportedThe results suggest a potential double-digit IPC gain for Zen 6.Latest from Tom's Hardware: “the supposed 15% single-threaded IPC increase you might have seen reported this week. However, it isn’t quite that clear yet.”
SupportedThe EPYC 9996 is a 256-core server chip using Zen 6c.Latest from Tom's Hardware: “the AMD EPYC 9996 is an absolutely gargantuan server processor with 256 “Zen 6c” cores”
SupportedThe EPYC 9996 has 1GB of L3 cache.Latest from Tom's Hardware: “to say nothing of the 1GB of L3 cache on the full EPYC 9996. Yes, 1GB of L3 cache.”
SupportedThe comparison matched both processors at 4.1GHz.Latest from Tom's Hardware: “Matching the CPU core clock rates at 4.1 GHz”
SupportedIn Linux, the EPYC 9996 scored 2847 and the Ryzen 7 9700X scored 2483 in the single-threaded test, a gain of about 15%.Latest from Tom's Hardware: “The Dell PowerEdge R9815 server hosting the big EPYC part scored 2847 in the single-threaded test; 326’s Ryzen desktop scores 2483 in Linux”
SupportedThe HTML5 Browser test showed a 24% performance gap.Latest from Tom's Hardware: “the biggest performance gulf is some 24% in the HTML5 Browser test”
SupportedAsset compression showed a 19% gain.Latest from Tom's Hardware: “The 19% gain in asset compression”
SupportedVideo encoding showed a 21% gain.Latest from Tom's Hardware: “the 21% gain in video encoding”
SupportedPhoto editing showed a 17% gain.Latest from Tom's Hardware: “and the 17% gain in photo editing”
Not in the sourcesThe results are the first concrete indication of the architectural gains AMD achieved with Zen 6.Latest from Tom's Hardware: “there aren’t really many third-party benchmarks out there yet, but somebody ran GeekBench 7 on one”