I switched my Z3740 from MCM to UGM (when it started) and its RAC has risen from 750 to 1050. It also measures 5 watts at the wall as opposed to 4 when running MCM or FAAH. I don't know if UGM runs well on all Bay Trail devices but it was a nice surprise for me.

http://ark.intel.com/products/codename/55844/Bay-Trail#@All

I have an Nvidia Tegra Note 7 with 4 ARM A15 cpu cores (Tegra 4) running WCG grid too. I couldn't use all 4 cores this summer as the battery overheated and WCG stopped but I am able to run it on 3 cores at 100%. My device statistics are:

11/09/2014 08:03:01 0:096:07:10:58 194,645 675

I think this may be greater than the Intel Z3740 but it is definitely using more power since I have an 11W solar panel that I run it from when sunny and it can't run the 3 cores at 100% but 2 cores at 80%. I'd say it is closer to 8W.

From memory, it benchmarked WCG at approx 1/2 performance of my Intel G1610 desktop CPU so these small tablets/laptops (even smartphones) are becoming pretty powerful.

Two points to note about using tablets and smartphones is:

1. I've only ever seen my tablet process FightAIDS@Home - VINA tasks so they may not participate in the full range of tasks.

2. The screen has become discoloured where the CPU is so I think that the heat from it may have done this. It is not extremely noticeable but the close proximity of the CPU to the screen could affect devices.

My Z3740 always runs at 1866mhz while running WCG.