Ok, I'm going to go with the assumption that 465's are just 470's with certain parts damaged beyond a certain threshold so they underclocked etc them to 465 stats and sell them for cheaper instead of taking a total loss, this being said not all will be able to be upgraded to 470's so it's pretty much a pick and see what you get kind of card.
If I'm wrong someone please correct me, But If I'm not, I'm going to say that theres a chance that the MSi card shown may by able to be unlocked, and a chance that it won't be, stably.
If the card has the same # of modules then I think it can be unlocked with a bios flash but you must match the old clocks and edit the new bios to match the timings that of the old bios when it comes to the vram which means manually typing but beyond that you are unlikely to have a successful flash.
As for the sli hack hi five I am using it now on my older 790x sb600 board with two 9800gt 1gb editions. Its a shame that my older 8250e tri core can't really keep up.
The MSI Twin Frozr II "Golden Edition" has 10 RAM chips and the same PCB as a GTX 470. Almost all of them will unlock (it has a very high success rate). There is a huge thread devoted to this card at Overclock.net with resources in the first post on how to go about doing it:
You don't need to lose the warranty. Flash it back to a GTX 465 if its just artifacting and needs to be return. Takes about five minutes. Even if its black screen dead you can flash it back using a cheap PCI video card. Unlock rates are very, very high (check the graph on the Overclock.net link I provided). No, its not 100%.
A card like that is more of a "hobby" thing and thats part of the fun of owning it. If you have no interest in tinkering, by all means get a GTX 470.