Hi, I have following rig with:
•4 x Sapphire Radeon R9 290 graphics cards
•AMD Sempron(tm) 145 Processor 2.80 GHz
•Gigabyte 990FXA-UD3 motherboard
•RipjawsX DDR3 16GB installed Memory
•WD 320GB Hard disk
•ThermalTake ToughpowerXT GOLD 80plus 1475W power supply
•Windows 7 Home Edition 64bit operating system.

I used to mine ETC using claymores miner but stopped due to costs and also no foreseeable potential of ETC price rocketing!!!
I was wondering if there is anything I can usefully still mine? I can take a loss so long as I see potential for the coin price growth.
I would like to mine GRIN  but not sure if the graphics card supports the level of power needed for this.

Any help would be appreciated.

Thanks.