It's not like your chipset suddenly remembered it had SATA 2, so the IOPS has nothing to do with that. It does, however, point towards the drive being busy. Resource monitor is rather complicated, and if you're running W10 (and maybe W7, I can't remember), you can get a decent overview of disk usage from Task Manager. If not, in Resource Manager, go to the Disk tab, make sure it's sorted by "Total (B/sec)" and look at what's at the top of your list. Also, look at the disk graph at the right and look at the scale of the graph - idling at the desktop the graph should be 1MB/sec or smaller. If it's higher, something is using your drive. If so, it should show up in the "processes with disk activity" overview, at the top of your list.1). Yes It’s the huge drop in IOPS that I am referring to and I realise sata 2 will have an effect. My specs are :-
Asus P5W DH/Pentium D 940 3.20GHz/ATI Radeon HD 4770/2 x 2 Corsair PC2-600 (400MHz) old I know but it does the job for now.
With regard to the bottleneck I have not changed/added anything since the higher IOPS readings that I posted.
Windows Updates? Game updates? Constant, heavy drive benchmarking? Other than that, there's not much that can write 50GB of data without increasing used disk space ...2) Yes what on earth has wrote 50 GB , I honestly have not moved any large data since installing the SSD.


From looking at those pictures, I can't see anything immediately fishy. I do notice a significant (~10 second) spike in disk activity in the graph on the right, though. Wonder what that is, since it's clearly gone away before the screenshot was taken.*snip*
Try some updated ICH7R drivers.. Worth a shot.
Also hit it with JRT and MBAM. I would also remove the page file (disable temporarily), run SFC /scannow in cmd as admin, then dism /online /cleanup-image /restorehealth (and then enable page file).
Finally, remove AVG and see how it runs.
From looking at those pictures, I can't see anything immediately fishy. I do notice a significant (~10 second) spike in disk activity in the graph on the right, though. Wonder what that is, since it's clearly gone away before the screenshot was taken.