I bought the 512GB version in flash range to 159.90. At first I tried you on a Asus board with Intel Z77 chipset and extremely poor values s get so around 30 MB / for read and write. The solution was a change of power supply for the SSD. Instead of directly to the SATA port I have used a Molex to SATA adapter and so she immediately the full power of 520 MB / s read and when brought 420 MB / s when writing. The difference in power is actually just that via Molex bear no 3.3V. The SSD has obviously a problem when 5V and 3.3V are simultaneously applied. I then installed in a Samsung laptop with Intel HM76 chipset and since it works without problems. Basically a super SSD for the price, but one star deduction for the bitchiness to the power supply.