I know this is an old thread but it was useful to me. I also installed this PNY module in my Duo mark 1 and it passed two tests that took just over an hour with each cycle taking about 9 mins. The module had 16 chips - 8 each side.
I have to say though that I have not noticed any difference in performance. I was hoping for an improvement in speed when managing the Logitech media server via the web interface while listening to music on my Touch. There is no noticeable improvement even after setting the media server to use more memory. This is with radiator 4.1.8 and media server 7.7.2