I’ll repeat the advice that always comes up with GPU hardware issues… Tim pointed it out already in this thread.
Check your PSU.
Rated wattage is not enough… you also need quality. You cannot skimp on the PSU. It’s OK to get cheap motherboards, CPUs, RAM, and hard drives, but the PSU is intimately connected to the GPU.
Using a $75 PSU like the CoolerMaster GX is just a bad idea in general.
What symptoms do you get with a low quality PSU? Hard to diagnose failures. Sometimes the GPU isn’t detected, sometimes it works fine but only for some benchmarks, sometimes it works fine for weeks and corrupts data only one time in a thousand.
These are all hard to diagnose, especially the 1 in 1000 failures.
Wattage rating is not enough to consider… you also really need to check quality. Price usually tells.
The Thermaltake Toughpower PSUs are my current pick, but PC Power and Cooling is also reliable.
I’ve also used Corsair and Antec in the past… those are also good brands but I STILL had a PSU instability with an Antec once.
With a $2000 C2050, please spend $250 on your PSU.
Wattage rating should always be generous for even more safety. You can measure your peak power use with a Kill-o-Watt and multiply that by 1.5 to get a good baseline of what your PSU should supply.