The tests were performed in a controlled air conditioned room with temperatures maintained at a constant 24c – a comfortable environment for the majority of people reading this.
Idle temperatures were measured after sitting at the desktop for 30 minutes. Load measurements were acquired by running Furmark and Cinebench together. Room ambient temperatures were 23c.
We measured results with CPUID Hardware Monitor software. The CPU was loaded with Cinebench in a loop and Furmark stress test.
The processor peaks at around 80c, although our particular review system incorporates a Core i5 3427U. With the Core i7 option available from their online store, this is likely to peak close to 90c however, or introduce considerably more fan noise.
We attached five diodes to the back of the chassis and measured the temperature after one hour of intensive work and gaming.
The only part of the ThinkPad X1 that gets hot is the back section close to the exhaust vent. Most of the hot air is expelled here and it can get toasty when placed on a lap.