Tom’s Guide reviewer Jason England reported that a Microsoft Surface Laptop Ultra with NVIDIA RTX Spark and 128 GB of unified memory rendered a ComfyUI image in under 20 seconds. The same system lasted about 10 hours in England’s browser rundown. Those observations describe one laptop and the reviewer’s workflows—not every RTX Spark model. England’s hands-on account also covers AI agents, creative tools and a game that initially failed to launch.
For workload-by-workload benchmark results, see NeoTeo’s earlier coverage of NVIDIA RTX Spark benchmarks. England’s account adds a different perspective: what local tools and everyday browsing looked like on his 128 GB system.
Local creative work and AI agents
In ComfyUI, England turned a sketch into a stylized image in under 20 seconds and also produced an image-to-video result. He reported using NVIDIA Broadcast to upscale a 1080p, 30-fps camera feed to 4K at 60 fps with a studio-light effect. These are observations from his workflows, rather than a standardized benchmark set.
AI agents made for a less polished demo. In The Sims 4, England used Hermes Agent with Qwen 3.8 Flash Next. The agent struggled with the building menu and shifting screen coordinates; after roughly three hours it had built a home, then started a kitchen fire. England reported better progress when he gave it calmer feedback and structured guidance.
He also connected a custom Hermes Agent, Jeeves, to his personal Google Workspace API and used a browser script to read mail, remove unwanted messages, draft replies and assemble a prioritized task list using email and Slack. That example involved his own setup; the results belong to that workflow.
NVIDIA lists two N1X laptop configurations
NVIDIA’s RTX Spark specifications list two N1X laptop configurations. The 20-core option has a 6,144-core Blackwell RTX GPU and up to 128 GB of LPDDR5X unified memory. The 18-core option has a 5,120-core GPU and up to 64 GB. NVIDIA lists a 45–80 W TDP range for both.
| N1X configuration | Grace CPU | Blackwell RTX GPU | Maximum LPDDR5X unified memory | TDP |
| 20-core | 20 cores | 6,144 cores | 128 GB | 45–80 W |
| 18-core | 18 cores | 5,120 cores | 64 GB | 45–80 W |
The review identifies its Surface Laptop Ultra as a 128 GB system. That memory capacity sits at the ceiling of NVIDIA’s 20-core configuration, but the practical observations above remain specific to England’s tested laptop. NVIDIA also lists Windows 11 and CUDA support; those platform features don’t describe the behavior of every individual application.
Red Dead Redemption 2 needed a workaround
England’s Red Dead Redemption 2 attempt first returned an incompatibility error. NVIDIA’s suggested DirectX 12 steps did not work in his setup. He then used Hermes Agent to change configuration code, after which the game booted.
England also reported that the system’s CPU speeds trailed Apple’s M5 Pro and M5 Max, particularly in single-core performance. His browser rundown reached about 10 hours on the same Surface Laptop Ultra, while the local AI and creative workflows offered a different use for its RTX hardware.
