Graphics card suitable for Dell 27 inch

[JerryLove]

memory usage only at 29%.

Thats not a good thing, unused memory is wasted memory - best to use it as cache/buffers for disks, or commonly used binaries, and evict these items as required, when there is a burst. This overall gives better peformance, with no real loss of agility. Windows is a bit dim with regards to this, on boxes with higher amounts of memory available, though. 29% used of user memory, fine, but you should only need like 5% reserved free.

It's a good theory: memory should always be almost full, but I would think practical problems of what to cache, and also of actually reading that several-GB from drives that make want to do something else, could throw a kink in it.

Would the putting to use of unused RAM make a noticeable difference? I think in most cases the answer is "no". So using the extra CPU cycles (and HDD bandwidth) to keep deciding on and updating a RAM cache of data you don't access is a waste.