Hardware

Is this corsair ssd (CSSD-F120GBGT-BK) compatible with MSI motheboard (890FXA-GD70)?

Yes, it's compatible. Here's the reason why: the SSD is a SATA III configuration and the MSI motherboard has 6 SATA III ports. Just be sure that you plug in the SSD to the first port. Some motherboard companies label that as port 0 or port 1.

Read your motherboard manual and verify what I've said. Also, be sure to set the SSD as the PRIMARY drive and as the First Boot Device on the BIOS and SAVE those settings. Then you should have no issues installing Windows 7.