They look fine. Hard drives have more issues with random read/write operations and the 840's MLC(with 3 bits per cell) is not the fastest at righting data, but as you can see, quite good at reading back data.
Just ensure that you have the latest SATA drivers and are in AHCI mode you should have no issues.
This is seagates new drives(cheap with a lower warranty, but still fast for a hard drive.).
I ram was tested with a ramdrive(just a very small 1.5gigabyte one to hold some programs).
The seagate model number was ST2000DM001(they have managed to push the data density on the platters resulting in this extra speed). I still like my WDC Blacks as they work well and have shown to be quite reliable.