Biostar

This could happen when Clear CMOS, then boot to OS directly.

For AMI core 8 BIOS after Clear CMOS, it will require system to load optimized BIOS setting, then save and exit the BIOS.

Problem will resolve after load BIOS optimized default setting.

Yes, both GTX760 and GTX780 VGA card will be support by Hi-Fi Z87W motherboard.

Please be sure power supply on system have enough wattage for these high-end VGA cards.

We suggest to use 500W or higher power supply for support these two VGA card.

Yes, H61MGV3 will support Intel G620 CPU.

Please refer CPU support list on Biostar website.

http://www.biostar.com.tw/app/en/mb/introduction.php?S_ID=652#cpu

mSATA speed on Hi-Fi B85N 3D is 3Gb/S speed.

Due to Intel chipset limitation, B75 series motherboard will not be able to overclock CPU Clock function (FSB).

By Intel specification, 1920x1200 is the maximum resolution for DVI and HDMI® display for the on-board graphic.

Yes, our TA970 motherboard will be able to support ATI R7 260X VGA card.

When using 3TB hard drive on Hi-Fi A85W motherboard to install OS, press F9 key to select boot device and choose UEFI mode to install. It will help Windows system to recognize it properly.

When system boot to logo screen, press [Tab] key on the keyboard to by pass the logo, then monitor will show system information.

Or go to CMOS> Boot > Full Screen Logo Display set to disable to turn off the logo screen.

If system boot up too fast, please go to CMOS> Boot> Set Prompt Timout and set the delay time to 5.

System infomation will show 5 seconds on POST screen.

You should be able to fit in GeForce GTX 780 card on H55 HD board.
However, two PCI slots on motherboard will be blocked by VGA card's over-size cooling fan.