Thermaltake CAPO X Review Finds 5°C Rise in Upper System During Dual-PC Tests

Thermaltake’s CAPO X is a full-tower case designed to house two independent computers. A review tested an AMD Ryzen 7 9800X3D with Radeon RX 9070 XT and an Intel Core Ultra 7 265K with GeForce RTX 5070 Ti. The source review was originally published in Japanese.

Both systems maintained stable temperatures during simultaneous workloads, though the upper AMD system ran about 5°C warmer than when tested on its own. The review attributed the increase to heat from the lower Intel system, which appeared to affect airflow in the upper compartment. The test did not establish that all configurations would see the same change.

Under sustained workloads, the upper system’s CPU and GPU generally operated around 60°C. In the lower system, the GeForce RTX 5070 Ti reached about 60°C, while the Core Ultra 7 265K stayed near 50°C. Temperatures rose at the start of testing, then settled without substantial fluctuations.

The review used Cinebench 2026 for processor performance and 3DMark Steel Nomad Stress Test for graphics. It found each configuration sufficient for gaming on its own, while simultaneous operation showed how heat could affect the other system’s cooling. Warmer air from the upper rear fan supported the review’s airflow explanation.

The case has divided chambers and ample cable-routing space, but building with two computers requires separate motherboards, power supplies, and storage devices. The review also noted that the case lacks a fan hub, which may complicate cable management. It said a faster rear exhaust fan could help remove accumulated heat, and that fan placement, speed, and airflow need attention during sustained dual-system use.