Scenery Hang-up Problem

[Thunderbird1]

Greetings All.

I just upgraded my system to the following.

ASUS 8n-SLI Deluxe MOBO
MSI 6800 GT 256mb pciE Video Card
AMD 64 3200 2.0g CPU
Corsair Twin 512 memory.

The problem I'm having is the scenery hangs ups for about a half to a full second.  It's happening at both maxed out settings and reduced settings. I've downloaded the latest video card drivers, and still have a problem. When I fly straight and level it's typically not a problem. It's when I turn or do aerobatics the scenery bogs down.
Frame rates are not an issue, I've seen  70+ at times

Any Ideas or suggestions as to why this might be happening and possible solutions would be appreciated.

CJ

[Skittles]

Hard Drive! Whatcha got there? Cache, RPM, Read times?