What is running in the background?
Can you monitor CPU usage?
How are your temps (CPU, GPU)?
Watch MSI afterburner--
Look at the GPU usage: Is it constant?
Are the clocks fluctuating?
What does the frametime graph show?
I'll retest this again, but from off the top of my head..
running fraps(sometimes), msi afterburner(sometimes), and battloelog open in chrome because thats trhe only way to get into a game..
I'm pretty sure my CPU usage isn't that high(i will get a number soon), but my GPU usage stays constant at full load, 99%, only when i alt tab out it'll fluctuate, but thats it. depending on if i have an OC on my gpu of 1050/1500, it can reach 77C, it no OC then less then that.
as far as the clock flucuating i'll have to check again for you. But lemme know if this helps?