Last month, I posted journals about CPU comparisons and power utilisation in ultra mobile PC and Origami devices. VIAArena have now published a nice article by Van Smith from Vans Hardware with even more details about the C7-M ULV processor including the all-important battery life tests that I couldn’t find for my article.The tests were done using laptops but from these results we can calculate likey ultra mobile PC battery life figures.
Importantly, It gives us the first test result that confirms, as we expected, that the VIA C7-ULM processor would be the best choice of processor for ultra mobile PC devices under normal work conditions. The Celeron, didn’t do at all well in this test.
VIA’s midget processor extracts an amazing 7.31 hours of runtime out of a budget notebook using a 48.8 Watt-hour battery! The Pentium-M does pretty well, but still falls nearly an hour short of the VIA C7-M ULV processor.
UMPCs – 4 hours at minimum load.
By using a VIA C7, the results show 7.31 hours of min power draw. The maths are quite easy there because the CPU clockrate has a minimal effect on battery power at idle or low-load operations. As Origami devices have about 24 watt-hour batteries, the expected life is a little over half of that with the 48 watt-hour battery.
UMPCs – under 2 hours at full-load.
The full-load VIA example is just as interesting. The laptop tested gives 3.2 hours using a 48W battery. If you take into account the smaller disk drive, small screen and lower clock processor of an Origami CPU, I think you’ll see about 55-60% of that figure for your VIA-based UMPC. That equates to about 1.8 hours under full-load. Using a Celeron, that figure will be about 1.3 hours.
UMPC’s – 2.5 hour films.
In the real world, watching a film for example, you’ll be making sure that your films are under 2.5 hours long with a VIA-based UMPC. If you’re a Celeron user, I hope you’re a cartoon fan!
Remember that the VIA processors have lower processing performance than Pentiums but for the average user, the C7-M ULV looks like the best choice for UMPC’s
Here’s looking forward to the real first side-by-side ultra mobile PC battery life tests.
Take a look at the report. Its a really good read. Well done and thanks to Vans Hardware.