[MENTION=127004]amjath[/MENTION]
Download This.
Display Driver Uninstaller Download version 15.1.0.2
Remove every trace of display driver from your PC with this.
Unplug and Replug the card in pcie slot
Restart PC.
Download GPU Z (if not already have) , download 3D Mark, Download Unigine Heaven/Valley.
Download NVIDIA DRIVERS GeForce Game Ready Driver for Grand Theft Auto V WHQL
install driver.
Open GPU Z in background. Check Clock speeds and idle temps.
In GPU Z
First check "Log into file" box and start logging a session.
Now run 3D Mark , benchmark in all three sections including Firestrike
run Unigine Valley/heaven in 1080P max preset.
Benchmark both and save.
now open GPU Z logfile. check in Core and Memory, what is the MAX Reading, Check MAX Temp Readings, Check MAX GPU usage reading, Check MAX VRAM usage Reading Check Perfcap reson if any.
Also open GPU Z and check perfcap reason if it highlights any other than
gray ("Util" No strong 3D task load) , check what it is, it can be
green("pwr" hitting power limit),
blue ( "Vrel" Max Reliability Volage, your card cant not boost higher because its hitting max reliable voltage limit, i.e. voltage locked but can boost higher if overridden with third party OC software),
orange ( Vop, maximum Operating Voltage, card is not boosting because it has reached max operating voltage allowed by nvidia for that card, and operating above this would result damage.)
Also check in GPU Z if your Max Core/Memory clock reached at full load in "sensors" tab while doing benchmark is matching or is close to what the GPUz "graphics card" tab shows that it is supposed to reach after boost.
Now Google and compare with results for 3D Mark and Heaven/Valley.
If you're results are significantly poor than standard scores, or there is any abnormality in the clock/temp/perfcap There is definitely some problem with your card or setup. But first let us know results. Post SS in next post.