To my understanding, there are no bug fixes in 7.306. It will give some sort of notification about their new memory upgrade program if your system has consistently high memory usage. It looks to be mostly for those with 110 or 200 series boxes or equivalent. This is in preparation for the release of 7.400, which apparently won't run well with less than 1GB memory.
That depends on how many features you actually turn on and how much you stress the unit. v7.400 may run very well even with 512MB memory if you don't activate all those memory-consuming features (IPS is a good example).
To reinforce this, it is completely possible that if your device is already not stressed overly, that 7.400 will also just just fine. The upgrades are optional and *not* required for continue support/warranty/operation. We just took this opportunity to allow for more life out of the existing appliances that could benefit from more memory instead of just end-of-lifing them and forcing new model upgrades on our customers or leaving them behind feature wise. It also allows for owners of some older 1xx/220 appliances a cheaper path to obtain the latest revisions.
So while you are free to upgrade, and 7.400 would run best in many environments with 1024mb of ram, it is not mandatory.
Yeah, I've been testing the 7.400 betas on 512MB equipped machines on purpose, to determine how well it will work for customers of mine that are on older 220 or 1x0 units. I think if you don't turn on extra features, like the https content scanning, it'll be fine... turn them on, and you'll need 1GB... I'll probably have several customers that will take advantage of the upgrade opportunity.
Yeah, I've been testing the 7.400 betas on 512MB equipped machines on purpose, to determine how well it will work for customers of mine that are on older 220 or 1x0 units. I think if you don't turn on extra features, like the https content scanning, it'll be fine... turn them on, and you'll need 1GB... I'll probably have several customers that will take advantage of the upgrade opportunity.