Was it the same module?
How much newer is the second NV+?
You are right about memory upgrades being a gamble. I tried the 1GB module out of a 2004 HP laptop as it matched the specs. It worked great, but since I only used it as a file server without any add-ons, I noted no significant performance increase, and when I needed the laptop back, I returned the original memory module back to the NV+ and the 1GB back to the laptop. That was over a year ago now.