bdary
If you're seeing your CPU usage at 100% and at the same time you have stuttering in games/benchmarks, then you have a pretty good bottleneck effect going on.  Your CPU isn't keeping up with your GPU.
 
You can try overclocking your CPU if you're comfortable with that, or upgrade it.
 
Also what resolution monitor are you running?  Higher res monitor (1440 on up) could reduce the bottleneck to some degree.

Jackl3
@bdary thanks for the reply.

My cpu is clocked at 4.8ghz on 1.108v.
I have a 1440p 60hz monitor and a 144hz 1080.
Tried both and the same occurs.

@cool gtx - thanks for the reply

Nvidia inspector gace me the tool to monitor.
Ive left all the nvidia options to default.

I will have to return home and edit this reply but I'm on windows 10 with having just updated to anniversary edition

My nvidia drivers were completely removed by ddu and installed. Tried both certified and the beta for dpc issue.

Only applications I know that run in background is steam, battle.net, AVG, malwarebytes.

Can list the full processes in a few hours?

Jackl3
Specs:
 
i5 3570k
8gb ram, ssds etc

Having observed latency mon whilst idle it seems to only go up to 100us. When opening an After looking at latency mon whilst idle it seems to only go up to 100us. When opening an application it will spike over 1000us. I have downloaded the beta driver and it seemed to reduce idle dpc issues.

My issue is of course the stuttering still in benchmarks/ some games like GTAV but if I leave latency mon on there's no big spikes even against running games.

I used nvidias tool to monitor gpu percentage and cpu percentage whilst running Heaven benchmark.

I found that the cpu is always at 100% whilst the stuttering comes from the gpu going down from 100%.

See this (From running Heaven 4.0 benchmark)
 
http     ://imgur.com/9iJBsSg.jpg

The dips are when the stutters occur and some are worse than others. 

Is this still dpc or am I facing another issue here e.g. my i5 3570k is causing me issues ?
 
My timespy benchmark:  
http     ://www.3dmark.com/spy/118908
 
my cpu score is terrible as well - if I upgraded cpu would the stutter go? 

Jackl3
 
@Cool GTX -
 
From Processes tab: Assorted by memory:
 
Chrome x5
SQL Server Windows NT - 64bit - x3
Steam Client Bootstrapper
Cortana
Logitech Gaming Framework
 
Assorted by CPU:
SQL Server Windows NT vs Google Chrome 
System interrupts
System
Task Manager.
 
 
Done as you said but still no difference when I tried this method.
 
Win10 is an upgrade - I could try on the weekend to start the process of a clean install.
 
 
 
@ CoercionShaman
Yes I have ran DDU since the AE update :(.
 
Also thank you I have now updated my sig.
 
 
 
@ 
 
Thank you for the link I will try this.
 
I have a 1440p monitor as well at 60hz. I have tried this and it is still the same.  I keep getting stuttering in Heaven benchmark.
 
 
@Everyone
 
I have noticed that my overclock left Turbo Mode to auto - I have disabled this to see if it would make any difference - however still getting the issue -  A recent bios update did remove my OC profile and I also loaded it back up as I had it saved.  Still, no difference but the CPU on all 4 cores are around 50-40% readings this time.
 
Is this driver or am I still looking at another issue e.g. CPU?