Passive systems, however, cannot remove as much heat as a fan, and that's why Durabook chose the hyper-efficient Y-Series with its much lower TDP (Thermal Design Power) of just 4.5 watts. TDP is a measure of the maximum processor-generated heat that must be removed, and generally also a measure of performance.

So does that mean the 4.5 watt Y-Series processors available for the U11 make the new tablet slower than the 15-watt U-Series-equipped R11? Not necessarily. What happens is that the Y-Series chips run at much lower clock-speeds when seed and performance is not needed, which is the majority of all work. However, the Y-Series chips can reach high clock speeds when full performance is needed, for a brief period of time. This means that Y-Series chip performance is not as predictable as that of U-Series chips that run much hotter. But no fan needed, running cooler, better battery life, and more than enough performance for most field tasks.

Durabook Americas offers the new U11 with three different chip options. These are:

DURABOOK U11: Available Processor Options

Available DURABOOK U11 CPUs	Intel Core i7	Intel Core i5	Intel Core M3
Model	7Y75	7Y54	7Y30
Cores/Threads	2/4	2/4	2/4
Base Clock Speed	1.30 GHz	1.20 GHz	1.00 GHz
Turbo Speed	3.60 GHz	3.20 GHz	2.60 GHz
Thermal Design Power (TDP)	4.5 watts	4.5 watts	4.5 watts
Smart Cache	4MB	4MB	4MB
Integrated graphics	HD Graphics 615	HD Graphics 615	HD Graphics 615
Graphics base speed	300 MHz	300 MHz	300 MHz
Graphics max speed	1.05 GHz	0.95 GHz	0.90 GHz
Intel Stable Image Platform Program	Yes	No	No
Intel TSX-NI	Yes	No	No
Intel Trusted Execution	Yes	No	No
Intel vPro	Yes	No	No

Customers can also specify an 8mp rear-facing auto-focus camera in addition to the standard 2.0mp front-facing webcam.

Ruggedness for the field