The Dell XPS 13, Toshiba Z830, Lenovo U300s and Samsung Series 5 were with me towards the end of week so in addition to the live webcast, I took the opportunity to try and do a round-up video.

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We had some quality time with the Dell XPS 13 and the Lenovo U300s in a side-by-side test during the recent Ultrabooknews Webcast. Here are some notes that might help you choose between these two gorgeous Ultrabooks.

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Early in January I put forward an article which highlighted the differences between the ‘ultra low voltage’ CPUs you get in Ultrabooks and the ‘low voltage’ CPUs you get in many laptops. I gave some comparison figures for two devices  in different usage scenarios by measuring ‘system’ power drain and it was only in the high-end tests where we saw the ULV processor being significantly more efficient. In this article I continue the testing and compare the LV and ULV cores directly. The results are blow.

Part 1 – Ultrabook ULV vs Notebook Mobile CPUs

Measuring ‘system’ drain on two different systems isn’t the most scientific of tests so a discussion broke out in the comments about how we could measure a true difference in efficiency between ULV and LV processors and whether it could be possible to run low-voltage processors at slower clockrates and get the same efficiency as a ULV processor.

The theory says ‘No.’ If you run a CPU at the same frequency but with a higher voltage, the power usage goes up.

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The Asus Eee Pad Transformer Prime is shaping up to be a hot seller with its quad-core Tegra 3 CPU/GPU combo and its attachable keyboard. Just a few days ago, our pal Ritchie got his hands on the Transformer Prime and produced a great overview video of the device. Now he’s drilling down the specifics.

Ritchie has fielded a number of questions from folks interested in the Transformer Prime, and prepared a whopping 5 new videos for your viewing pleasure. We’ll drop one here, but if you’d like more, certainly go visit the post over at Ritchie’s Room.

httpv://www.youtube.com/watch?v=34REyjGuIis

Available with Core i3 (1.3Ghz non-Turbo) and Core i5 (1.6Ghz, Turbo-enabled) the Samsung 900X1B (Series 9 range) is a stylish alternative to the ASUS UX21. It’s been around for a few months and in theory, it’s not an Intel Ultrabook but apart from slightly slower quick-boot and a missing TPM module (we are told) it’s an Ultrabook! Later this week we’ll be testing it and comparing it to our ASUS UX21 experiences.

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Though Sony’s Tablet S has been known about for months now, today they finally unveiled official specifications for the device. While weight isn’t the spec that everyone jumps at immediately, it’s certainly an important factor for a large 10” tablet. Sony says that their Tablet S is just 595 grams, which makes it the second lightest of the top 12 tablets, right between the Samsung Galaxy Tab 10.1 and the Apple iPad 2 (with the Tab 10.1 being the lightest) – quite impressive considering that the Tablet S design isn’t as thin as many of the other tablets on the market because of it’s interesting folded shape, though it should count itself lucky to be considered a 10″ tablet when the screen is actually only 9.4″. Have a look at how the top 12 ten inch-category tablets compare:

I would love to be able to say that tablets are getting lighter as time goes on, but as you can see, there are four Honeycomb tablets that were released after the first (the Xoom) that are actually heavier (though the Eee Pad Slider sort of has an excuse!).

The Tablet S is only about 1% lighter than the iPad 2, but Sony designed it with that funky shape specifically to make it feel lighter in one hand by grouping the weight on one side and reducing leverage again your hand. I’d be curious to see how much torque the iPad 2 puts on a hand vs. the Tablet S.

Though Sony’s Tablet S has been known about for months now, today they finally unveiled official specifications for the device. While weight isn’t the spec that everyone jumps at immediately, it’s certainly an important factor for a large 10 inch tablet. Sony says that their Tablet S is just 595 grams, which makes it the second lightest of the top 12 tablets, right between the Samsung Galaxy Tab 10.1 and the Apple iPad 2 (with the Tab 10.1 being the lightest) quite impressive considering that the Tablet S design isn’t as thin as many of the other tablets on the market because of it’s interesting folded shape, though it should count itself lucky to be considered a 10″ tablet when the screen is actually only 9.4″. Have a look at how the top 12 ten inch-category tablets compare:

I would love to be able to say that tablets are getting lighter as time goes on, but as you can see, there are four Honeycomb tablets that were released after the first (the Xoom) that are actually heavier (though the Eee Pad Slider sort of has an excuse!).

The Tablet S is only about 1% lighter than the iPad 2, but Sony designed it with that funky shape specifically to make it feel lighter in one hand by grouping the weight on one side and reducing leverage again your hand. I’d be curious to see how much torque the iPad 2 puts on a hand vs. the Tablet S.

If you’re in the market for a 7 inch slate, Samsung’s 7 inch Galaxy Tab is the undeniable leader in this area… but it’s definitely not the only device you should consider. Take, for instance, Enspet’s Identity Tab e201. This 7 inch device is nearly spec-for-spec identical to Samsung’s Tab, less a lower screen resolution, but it actually performs just as well and even beats the Galaxy Tab on some benchmarks. Have a look at the two in a head-to-head video below: