Asus, MSI, Gigabyte, Biostar and Jetway companies are showing their upcoming P55 motherboards in CeBIT. Asus is showing off two, the P7U and P7U Pro, both features a single, open ended PCIe x4 slot, two PCIe x1 slots (three for the P7U), a PCI slot, four DDR3 memory slots supports dual channel mode, an IDE, five SATA, four USB 2.0 headers…