I said the G boards are aimed more at the office market & the P boards aimed more at the consumer entertainment market. The G boards contain a TPM while the P boards do not.
From a Intel Resellers page.........
For today’s digital office, the Intel Desktop Boards D915GEV and D915GUX deliver next-generation security technology with the Trusted Platform Module (featured on desktop boards with Gigabit LAN). This component on the desktop motherboard enhances platform securityabove-and-beyond the capabilities of today’s software. Defined by the Trusted Computing Group’s public specification, the TPM provides hardware-based protection for the encryption and digital signature keys that secure your data’s confidentiality.