Yes, the Georgian Oil War and all single/multi missions load up nicely.
DirectX 9.0C, brought up-to-date through Windows I believe.
Missions that load properly only take about a minute. I tried loading the campaign and left it there for a full hour and nothing happened, it still gets stuck on the first loading screen (it does not drop to the desktop at all).
The cache size doesn't seem like that big of a bottleneck to me. Even in very CPU demanding games like FSX I get around 40FPS with settings nearly maxed out.
Some things I've tried so far: de-fragging the hard drive, cleaning my registry, and reinstalling DCS. No luck. :(