Test: iPhone Duo sustains load better than Galaxy Z Fold 8

Tom's Guide ran a 20-minute 3DMark Wild Life Extreme Stress Test on the iPhone Duo and Galaxy Z Fold 8. The iPhone Duo ran hotter at 103°F versus 96°F but retained 67.9% of its performance against 51.4% for the Z Fold 8 thanks to its vapor chamber.

• Stress test stability: 67.9% for iPhone Duo vs 51.4% for Z Fold 8
• Best loop score: 7,639 on iPhone Duo, 7,047 on Z Fold 8
• Exterior temperature: 103°F on iPhone Duo, about 96°F on Z Fold 8
• Z Fold 8 chip temperature rose from 95°F to 113°F internally