MSI 890FXA-GD70 issues
Yes I have the same mobo and I am getting graphic drop and a system hard lock. At first I thought it was a motherboard issue till I sent it back on a RMA and got the same board, and low and behold same issue. Any insight will be greatful. SPECS MSI 890FXA-GD70 AM3 AMD 890FX SATA 6Gb/s USB 3.0 ATX AMD Motherboard. AMD Phenom II X2 555 Black Edition Callisto 3.2GHz 2 x 512KB L2 Cache 6MB L3 Cache Socket AM3 80W Dual-Core Desktop Processor - C3 Revision HDZ555WFGMBOX G.SKILL Ripjaws X Series 16GB (4 x 4GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Desktop Memory Model F3-10666CL9Q-16GBXL Western Digital VelociRaptor WD740HLFS 74GB 10000 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive EVGA 8600 GT graphics card Rosewill RV2-700 700W ATX12V v2.3 / EPS12V Windows 7 64 OEM
Start by testing your memory http://www.memtest86.com/download.html
Second thing I would check is the 8600GT GPU if possible try in another system.