So I am digging for the next couple units to build up, and pondering what is worth it to mess with... My freshly sorted MK6 almost sold right off my toolbox today. It may be gone by the weekend. I almost wish somebody would buy my MK1, but then not sure I would actually sell it if they tried... There always seems to be confusion as to max supported memory in each generation. I am surprised as none of my searches for specification lists pointed me back here. I found this though: https://www.toughdepot.com/panasonic-toughbook-cf-19-mk1-mk8/ I am not sure I believe that list... But I see a few points to ask questions about. I am guessing the processor speed jump from MK3 to MK4 is pretty significant? And can they both truly support 8gb memory? The low price for some of these might make it worth considering for a dedicated tuning/diagnostics laptop. I am most interested in the MK5, MK6, and MK7. MK5 to MK6 is a slight jump, but MK6 to MK7 doesn't seem to really be worth the extra price hike. Doesn't look like a real processor increase? Memory, I thought MK5 was limited to 8gb? Can the MK5, MK6, and MK7 actually utilize 16gb??? I can see some specs I know to be pretty accurate on that list. For my usage, the daylight screens are a game changer. Anything below a MK4 is unusable in sunlight. And for me personally no reason not to stick with an MK6. Especially if I can get 16gb of memory working in it. But is there any other specs not listed, like video, that would make a jump from a MK6 to a MK7, or perhaps even an MK8, worth the price difference? Right now the MK6's seem to be the best bang for the buck on eBay.