Question: how to check your graphics card for errors?
Answer: OCCT. OCCT is a well known testing tool that is able to stress multiple parts of the system like CPU, video card and power supply. ... 
GpuMemTest. ... 
FurMark. ... 
MSI Kombustor / EVGA OC Scanner X / FurMark Asus ROG Edition. ... 
Video Memory stress Test. ... 
MemtestG80/MemTestCL.