Yes, TA990FXe will support GSKILL DDR3 1600 2G memeory module.
If the DDR speed is not reaching 1600 MHz, please manualy adjust the memory frequency to 1600 MHz.
1. Go to CMOS> O.N.E> OverClock Navigator> Manual OverClock
2. Go to DRAM TIMING Configuration>MCT Timing Mode>Manual
3. Set Memclock Value to DDR 1600
4. Press F4 key to Save configuration and reset.