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Intel estimates that Lunar Lake’s Skymont E-core IPC is on par with Raptor Cove IPC for LLC/Ring workloads—but only under specific, fixed-frequency test conditions. Intel’s larger percentage gains use a different baseline: earlier low-power Crestmont E-cores.
What is Skymont IPC equivalent to?
The short answer is Raptor Cove, according to Intel’s estimate for LLC/Ring workloads. Intel limits that comparison to general, non-vector-heavy workloads at fixed frequency, with similar memory and fabric. It is not a claim that Skymont and Raptor Cove perform identically in every workload or system.
Intel published the comparison in its Computex 2024 Performance Index. The figures are Intel internal projections or estimates dated May 13, 2024, with a stated margin of error of ±10%; they are not independent benchmark results.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsWhat Intel’s comparison does—and does not—measure
IPC means instructions per cycle: a measure of how much work a core completes per clock cycle. It is not the same as clock speed, total processor performance, or application runtime. The Skymont-to-Raptor Cove statement is specifically an IPC estimate, not a guarantee that a Skymont-equipped processor will match a Raptor Cove-equipped processor in every task.
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Intel says the estimate uses estimated SPEC CPU 2017 rate base components and GCC 12.1-O2 on Linux. Its stated conditions include fixed frequency, similar memory and fabric, and general workloads that are not vector-heavy. The LLC/Ring qualifier is part of the claim; it should not be dropped when describing the result.
Why Intel’s 1.38x and 1.68x figures use a different comparison
Intel also estimates Skymont’s IPC against the previous generation of low-power E-cores, codenamed Crestmont. That comparison reports:
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- 1.38x integer IPC versus Crestmont.
- 1.68x floating-point IPC versus Crestmont.
These are May 2024 Intel estimates with a stated ±10% margin of error, based on estimated SPEC CPU 2017 rate base metrics and GCC 12.1-O2 Linux at fixed frequency. They are generational comparisons against Crestmont—not percentages by which Skymont exceeds Raptor Cove.
How to read the equivalence claim
- Skymont vs. Raptor Cove: Intel says IPC is on par for LLC/Ring workloads under the stated, fixed-frequency conditions.
- Skymont vs. Crestmont: Intel estimates 1.38x integer and 1.68x floating-point IPC for Lunar Lake Skymont.
- Application performance: Neither comparison establishes universal equivalence in real applications or across processor configurations.
Intel’s Skymont instruction-throughput and latency documentation and its Crestmont and Redwood Cove documentation provide microarchitecture reference data. They do not provide a universal IPC conversion or establish application-level equivalence.
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