I had my gpu overclocked for about 8ish months recently my gpu has only been getting 549.7 MHz, even when playing games. these are my computer's specs
cpu: amd fx 4130 @4.4GHz
gpu: msi nvidia gtx 660
gpu driver: 347.09
mobo: asrock 980de3/u3s3
ram: crucial ballistix sport 16gb
psu: ocz zt series 750W
case: diablotek evo
sound card: sound blaster audigy fx
os: windows 8.1
cpu: amd fx 4130 @4.4GHz
gpu: msi nvidia gtx 660
gpu driver: 347.09
mobo: asrock 980de3/u3s3
ram: crucial ballistix sport 16gb
psu: ocz zt series 750W
case: diablotek evo
sound card: sound blaster audigy fx
os: windows 8.1