I have been asked that question numerous times in recent weeks and to be honest it's a great question. Rumors are going around that OCZ Technologies has a special firmware revision that uncaps random 4K write performance on their Vertex 2 series. Other companies like Corsair offer Sandforce SF-1200 series controllers in their Force series and we didn't see the performance cap, but we did with Mushkin's Callisto series. To be honest the firmware situation with Sandforce drives is confusing so we went straight to Sandforce to try to get some answers. If you like SSDs then you should find this to be an interesting read!