Low FPS only in 25 man raids?

[skunk_monkey]

i get about 2 fps in 25 man raids in wow but the rest of the time its 30ish. what can i upgrade to improve my computers performance? my spec is below


Processor MainBoard

Central Processor


CPU Name AMD Phenom(tm) 9500 Quad-Core Processor
Code Name Model 2, Stepping 2
Manufactory AuthenticAMD
Current Clock Speed 2210 Mhz
Max Clock Speed 2210 Mhz
Voltage 1.5V
External Clock 200 Mhz
Serial Number 178BFBFF00100F22
CPU ID AMD64 Family 16 Model 2 Stepping 2
Socket Designation CPUSocket
L1-Cache 512 KB
L2-Cache 2048 KB


Motherboard


Model ALiveNF6G-GLAN
Manufactory ASRock
Serial Number
BIOS Name Default System BIOS
BIOS Vendor American Megatrends Inc.
SMBIOS Version P1.50
BIOS Date 24/11/2008


Video Adapter

Name ATI Radeon HD 5700 Series
Video Processor ATI display adapter (0x68B8)
Manufactory ATI Technologies Inc.
Video Architecture VGA
DAC Type Internal DAC(400MHz)
Memory Size 1.00 GB
Memory Type Unknown
Video Mode 1920 x 1080 x 4294967296 colors
Current Refresh Rate 60 Hz
Driver Version 8.850.0.0
Driver Date 19/04/2011

Memory Device

Memory Resource
Total Memory 4.00 GB
Used Memory 1.11 GB
Free Memory 2.89 GB
Memory Usage 0 Byte
Physical Memory
Memory Bank BANK2
Description Physical Memory 2
Device Locator DIMM2
Capacity 2.00 GB
Speed 533 Mhz
Manufactory Manufacturer2
Data Width 64 bit
Memory Type
Form Factor DIMM
Physical Memory
Memory Bank BANK3
Description Physical Memory 3
Device Locator DIMM3
Capacity 2.00 GB
Speed 533 Mhz
Manufactory Manufacturer3
Data Width 64 bit
Memory Type
Form Factor DIMM