Sounds like a problem with the LSI L-FW3227-100 chipset used on this board with graphics card... Texas Instruments should be the chipset of your choice for firewire... There are a lot of problems with others... Make sure, that graphics card and firewire are not sharing the same irq on the mainboard... Try moving your graphics card to other PCIe slots...
Try as well to set the firewire latency with the tool in utility folder of the MR Driver from small to medium or even large... If this all doesn't fix the problem, change your firewire chipset by deactivating the onboard one in bios and adding a pcie card with texas instruments chipset. If nothing helps, maybe change your mainboard to one with graphics onboard...
DAW 1: Commodore C64, 64 k, Windows Basic, Cinch out, Datasette and 1541 Floppy
DAW 2: Dell E5520 mit i5 2,3 GHz, 8 GB, Win 7 Pro x64, Cubase 7 x64, Nuendo 6 x64, Dante Virtual Soundcard
DAW 3: Intel i7-2600K, 16GB Ram, Win 8.1 Pro x64, Cubase 7 x64, Focusrite RedNet PCIe
DAW 4: Dell Precission 390, 4 GB Ram, Win 7 Pro x86, Cubase 7 x86, Dante Virtual Sound Card und RME HDSP 9652
DAW 5: Dell Poweredge 860, 8 GB Ram, Win 7 Pro x64, Nuendo 6 x64, Dante Virtual Soundcard
DAW 6: Lenovo ThinkPad T430u, i5, 8 GB Ram, Win 8.1 Pro x64, Cubase 7 x64, Nuendo 6 x64, Dante Virtual Soundcard
Anderes Zeug: Focusrite RedNet 3, 3x Steinberg MR816x, Cubase iC pro, 2x Behringer ADA8000, Frontier Tranzport, Native Instruments Kore 2, Yamaha LS9-32 mit 2x MY16-AUD Dante Cards, Yamaha 03d, 2x CME UF70, JBL L90, Tannoy 600 als 5.1 System, Sony D7, Sony R7, 2x Sony DVP55M, Lexicon LXP15, Yamaha MU100R, Korg i30, Korg x3, Korg i3, Korg Kronos, u.v.m. - http://www.mediacoustics.eu