Hi to everbody,

i have encounterd a strange performance behavior after testing several storage drivers. My mainboard is a asrock z77 pro3 and i am using a samsung 840 pro 256 gb as main system storage which is connected to the first sata3 port and a second hdd 2 tb which is connected to the second sata3 port. The bios is up to date, i have flashed it a few weeks ago to get the micro-code update.

I have set the ssd and the hdd in bios as hot-plug, selected ahci and disabled the aggresive link powermanagement.

"Write Caching" options of the SSD from within the Device Manager are checked, also for the hdd.
System is running with high performance (Win7 Energy Options)

A few days ago i decided to install different storage drivers to figure out which one has the best performance for my system. I started with the rapid storage driver 11.7.0.1013 (just the pure driver via devicemanager), than 12.9.0.1001 with software, changed than to the rapid storage driver 11.7.4.1001 (just the pure driver again) and after this tests i choosed the driver 12.8.0.1016 (with software).

Usually i got a benchmark result of min. 1100 points overall (using the as-ssd-benchmark) but now i get a max. result of 950 points. I tested in safe-mode in windows.
Than i went back to the version 11.7.0.1013 with just the pure driver, but the benchmark result was again just 950.
Actually i am using the version 13.1.0.1058 without software, the systems performance feels very good, fast, no stuttering or anything else. But after running as-ssd-benchmark i got again just a result of under 1.000.
Has anybody an idea what could caused the performance drop? Thanks for any suggestions.