I thought with friends but ok...test GPU with OCCT or some other GPU stress tool and see if you get that error again. If the error persists time for RAM card.
And one more thing ... if I'm wrong your RAM timings is set to AUTO in bios. Use CPU-Z to read RAM SPD timings and voltage and manually set that values in bios or if that RAM have XMP profile go in
BIOS->M.I.T.
Advanced Frequency Settings
Extreme Memory Profile (X.M.P.) -> Profile1
Save & Exit = Yes  Â
And one more thing ... if I'm wrong your RAM timings is set to AUTO in bios. Use CPU-Z to read RAM SPD timings and voltage and manually set that values in bios or if that RAM have XMP profile go in
BIOS->M.I.T.
Advanced Frequency Settings
Extreme Memory Profile (X.M.P.) -> Profile1
Save & Exit = Yes  Â