RTX Spark's 20-Core CPU Disappoints In Cinebench 2026's Multi-Core Leak Despite Set To High Performance Mode, Single-Core Results Show Promise But Only Against M3 Max

Wccftech's Omar Sohail reports that leaked Cinebench 2026 benchmarks reveal disappointing multi-core performance from NVIDIA's RTX Spark 20-core CPU, despite the Surface Laptop Ultra running the chipset in its hidden 'High Performance' mode. The benchmarks, shared via the TechPowerUp Forums by user "Fouquin," show single-core and multi-core scores of 540 and 5,771 respectively. While the single-core result puts the RTX Spark on par with Apple's three-year-old M3 Max, the multi-core score falls significantly behind — with the M4 Max outpacing the RTX Spark by 35.6 percent in multi-threaded workloads. The results come as a reality check for NVIDIA's Arm-based PC platform ahead of its Fall 2026 consumer launch, suggesting that the CPU component of the otherwise impressive GB10 Superchip may be its weakest link.

Key details from the leak reveal that the Surface Laptop Ultra does not enable High Performance mode by default — Fouquin had to uncover a hidden configuration to allow the RTX Spark's Cortex-X925 cores to boost to 50W and operate at 2.80GHz. However, these same Cortex-X925 cores are capable of boosting to 4.00GHz under optimal cooling conditions, raising questions about whether Microsoft has deliberately capped performance through software limitations or whether the laptop's cooling solution is insufficient to dissipate 50W of thermal load. The RTX Spark's Blackwell GPU and unified memory architecture remain its strongest assets, but the Cinebench 2026 results suggest that the 20-core CPU configuration — combining Cortex-X925 performance cores with Cortex-A725 efficiency cores — may struggle to match the multi-threaded throughput of premium mobile chips from Apple, Intel, and AMD.

For Canadian readers evaluating RTX Spark ahead of its Fall 2026 launch, the Cinebench 2026 leak provides an important dose of perspective. While the platform's GPU performance and AI capabilities remain industry-leading — with DLSS 4.5 Ray Reconstruction and over 1,000 TOPS of AI acceleration — the CPU results suggest that early RTX Spark adoption may be best suited for users whose workloads are GPU-bound or AI-accelerated rather than CPU-intensive. Canadian buyers considering a $2,900+ N1X Surface Laptop Ultra or comparable RTX Spark device should weigh these benchmark results against their specific workload requirements, recognizing that multi-core CPU performance — critical for video encoding, 3D rendering compilation, and heavy multitasking — may not match equally-priced x86 alternatives or Apple's latest M-series chips. Future RTX Spark generations will likely benefit from further Arm core customization and OS scheduler optimization through Microsoft's rewritten Windows 11 scheduler, but first-generation buyers should calibrate their expectations accordingly.