Run AS SSD (just open it, do not need to run the benchmarks) look at upper left and report what the driver is.
It will also show if the partition is aligned, Firmware version (which should be the latest).
Also verify that your laptop has the latest Bios firmware ver.
If Intel based chipset, best driver is iaSTor, followed by msahci. If it shows pcide = BAD - that will tell all. - Links do not work, an I did NOT look up your specific Laptop.
Added, Looking at the link rolli59 posted, Too good to be a "pcide" problem.
I personnally prefer the AS SSD benchmarks, even though they will be lower than "advertised" Sequencial performance.