What are disadvantages of g-31 motherboard

Compared to most other Socket 775 chipsets?
Intel G31 chipset based motherboards do not offer Hardware Virtualisation support, the maximum memory speed officially supported is DDR2 667MHz/800MHz, the maximum memory supported on the motherboard itself is only 4GB DDR2 RAM, and offers only one PCI-e 16x slot, so only one graphic card is supported, and CrossFireX/SLI is not supported.

The southbridge that comes with the G31 chipset is the ICH7, which does not support RAID, and only offers four SATA II/3.0GBps ports.

Also - old, obsolete chipset with very limited overclocking abilities.

yes very true...........