PPD too low from second system - Help please?

Looking at that log and the TPF of the two WU's and using the FAH bonus calculator here we get:

CPU is doing a 9000 WU @ 2m3s/f aprox for around 11K PPD

GPU is doing a 8900 WU @ 9m30s/f aprox for around 29K PPD

If you ran the GPU alone or with SMP6 you would probably get 33K max out of that GPU thats all they can do.
 
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The GPU is not overclocked, and when it was getting more points it was on Windows 7 rather than Windows 8. It was also crunching on its own rather than alongside a CPU.

I'm running SMP6 now.
 
I have two 560Ti-448s (so similar to the 570). They do 33K if completely left to fold and they're both oc'ed to 840. These units are totally dependent on running without any other load. If you play games or watch videos etc. it will make a huge difference to the returns you get.
 
Is it normal for a 670 to spontaneously shoot up to dizzy PPD estimates? Mine usually sits at around 80K but I have seen it sit between 100K and 120K for reasonably long bursts before. To me that just seems plain wrong. :p

It is clocked to 1230MHz on the core.
 
I've given up watching the PPD predictions from the f@h client. MSI GTX670 on an i7 2600K at stock can give anything between 75k to 130k, yet the only thing reliable is the results uploaded which seem to average around 82-4k if I don't use the PC for gaming stuff. Although I might be eeking a bit more out of that now having tweaked the CPU folding settings limiting that to 6 cores (of the 8 available) as apparently the GPU needs a core to itself.

What bemuses me is, despite everything set to full use, the GPU can suddenly decide to briefly idle (I know it does because I hear the fans slow down), and even when running it's unpredicable from anything between 85 to 99% GPU use.
 
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