Biostar

If you are using version 7.x or version 8.x motherboard, it will not support 5V standby power for USB ports. So system will not be able to charge the mobile phone.

Yes, PCI-E 16x slot will be able to use 1x card.

Due to Windows 7 does not have proper USB driver for N3150 (Braswell) chipset, it will unable to use USB memory drive (USB storage) to install Windows 7 OS.

Please check product specification page > OS support.

Godavari A10 R7, A8 R7 CPU will support Dual Graphics with R7 240, 250, 340, 350 graphic cards.

When system has 3 error beep sound, then this could be memory related problem.

For best support of J1800 and J1900 motherboard, please download the latest Linux version.

Linux driver for Realtek's audio can be download from Realtek's website.