Details:
I get choppy gameplay running around town. When I say choppy gameplay, I mean the FPS just drop off a cliff. Despite many other LS members have less 'computer' than I have, they can run flawlessly anywhere, without drops to FPS.

Steps:
1. Flawless gameplay in the fields outside of town, no loss of FPS.
2. In town, FPS drop randomly to under 10 FPS but then rebound. Happens frequently.
3. Running ATI Catalyst 11.8 or whatever latest official release is. Have tried others in the past to no avail.
4. Settings set to less than standard in FFXIV Config.

Date & Time:
Always had the problem.

Frequency:
Always happens.

Platform:
PC

PC Manufacturer & Model Number:
Home built
CPU: Q9550 Intel Quad Core (Overclocked to 3.4 Ghz)
RAM: 8 GB of DDR2-1066 (OC'ed to 1100)
SSD: Intel 120GB; OS files only
HDD: Western Digital 500 GB, 32 MB cache; program files on this disk

OS:
Win7 x64 Professional

Graphics Card:
Asus ATI 5850 DirectCU

ISP:
Time Warner

Type of Internet Connection:
Cable Internet: 10 MB


Question:
Is there an optimal ATI Catalyst driver that might help, like SE has listed on their FFXI official website?