Everex Cloudbook and Zyrex Ubud use VIA VX700 which supports 400/533MHz FSB. This is an older chipset.
HP 2133 Mini-Note PC supports 800MHz FSB with video/graphics Via Chrome 9 UMA which is in fact VIA VX800. Both Pioneer DreamBook Light IL1 and Norhtec Gecko use VIA VX800U (ultra low voltage). What are the differences between the two new chipsets?
The answers can be found in this article. Let me highlight the differences. VX800 supports gigabit Ethernet 10/100/1000, Front Side Bus speed of 400/800MHz, 250MHz clock speed for integrated 2D/3D video processor, SATA 2.0 and 1 x 4-lane and 2 x 1-lane PCI Express ports. On the other hand, VX800U supports 10/100 Ethernet, Front Side Bus speed of 400MHz and 166MHz clock speed for integrated 2D/3D video processor.
Thus, VX800 is faster but uses more power than VX800U. However, both chipsets are fully Windows Vista compliant.