am i bottlenecked?
 

I have an ASUS P5K-SE with a:
Kentsfield Q6600 2.66 GHz OC'd to 3.01 GHz.
Very stable but I think my video card might be limiting my frame rates and
overall performance when gaming.
I'd like to get a little more fluidity with my graphics.
Will upgrading to a 9800 GT smoothen things out or am I already maxed out
for what my video can deliver with the 8600GT?
Thanks for any suggestions

VIDEO CARD:
nVIDIA GeForce 8600 GT
GPU Clock (Geometric Domain) 540 MHz (original: 540 MHz)
GPU Clock (Shader Domain) 1188 MHz (original: 1188 MHz)
Memory Clock 301 MHz (original: 300 MHz)

CPU:
CPU Clock 2002.3 MHz (original: 2400 MHz)
CPU Multiplier 6x
CPU FSB 333.7 MHz (original: 266 MHz, overclock: 25%)
Memory Bus 400.5 MHz
DRAM:FSB Ratio 12:10

CPU Cache
L1 Code Cache 32 KB per core
L1 Data Cache 32 KB per core
L2 Cache 2x 4 MB (On-Die, ECC, ASC, Full-Speed)

Motherboard Properties
Motherboard ID 64-1402-000001-00101111-062509-Bearlake$A0807000_BIOS
DATE: 06/25/09 18:27:51 VER: 08.00.12
Motherboard Name Asus P5K SE (2 PCI, 3 PCI-E x1, 1 PCI-E x16, 4 DDR2
DIMM, Audio, Gigabit LAN)

Chipset Properties
Motherboard Chipset Intel Bearlake P35
Memory Timings 6-6-6-18 (CL-RCD-RP-RAS)
Command Rate (CR) 2T
DIMM1: Samsung M3 78T2863QZS-CF7 1 GB DDR2-800 DDR2 SDRAM (6-6-6-18 @
400 MHz) (5-5-5-15 @ 333 MHz) (4-4-4-12 @ 266 MHz)
DIMM2: Samsung M3 78T2863QZS-CF7 1 GB DDR2-800 DDR2 SDRAM (6-6-6-18 @
400 MHz) (5-5-5-15 @ 333 MHz) (4-4-4-12 @ 266 MHz)
DIMM3: Samsung M3 78T2863QZS-CF7 1 GB DDR2-800 DDR2 SDRAM (6-6-6-18 @
400 MHz) (5-5-5-15 @ 333 MHz) (4-4-4-12 @ 266 MHz)
DIMM4: Samsung M3 78T2863QZS-CF7 1 GB DDR2-800 DDR2 SDRAM (6-6-6-18 @
400 MHz) (5-5-5-15 @ 333 MHz) (4-4-4-12 @ 266 MHz)