We have only one generation of the 6310, so the 6310 sold today is the same hardware sold 4 years ago. And yes, the NV 6310 has approximately the same PPS performance as the TA 900e - (Approximately 30mbps aggregate with IMIX traffic, FW, QOS, Traffic-Shaping, FFE enabled.) Keep in mind that 50-100% VQM sampling will lower this number, although I'm not sure just how much... If performance is a concern with the 6310/900e, you should look at the NetVanta 6240 Series, (roughly doubles the PPS performance of the TA 900e, NV 6310, and 6330)
I went ahead and marked the correct answer on this post. However, feel free to post any additional questions you may have if you need further assistance.