In our own Sequential tests, the fastest read performance we saw was 3472.82MB/s at a QD of 16, which is a fair way short of the official maximum of 3,900MB/s. However, the peak write performance figure of 3,103.58MB/s (QD4) is faster than the official 2,900MB/s.
128KB Sequential Read Performance v QD
Both the Viper VPN100 and VPR100 use the same controller/NAND combination with the VPR100 having a newer version of the firmware. As you might expect there isn't much to separate the two, until it comes to the QD4 performance where the VPR100 pulls out quite a distance from the VPN100. But by the time of the QD32 test, the drives are back close together but with the VPN100 having a slight advantage.
128KB Sequential Write Performance v QD
Throughout the tested write queue depths, the VPR100 and VPN100 are pretty evenly matched.