upgrading my graphics card

hii I'm new to this forum and a not very savy on this stuff i hope you can help. I have a 960 workstation i just got refurbished and want to upgrade the graphic card for some gaming..

System Manufacturer    Dell Inc.
System Model    Precision WorkStation 490
System Type    x64-based PC
Processor    Intel(R) Xeon(R) CPU            5160  @ 3.00GHz, 2992 Mhz, 2 Core(s), 2 Logical Processor(s)
BIOS Version/Date    Dell Inc. A07, 12/13/2007
SMBIOS Version    2.3
Windows Directory    C:\Windows
System Directory    C:\Windows\system32
Boot Device    \Device\HarddiskVolume1
Locale    United States
Hardware Abstraction Layer    Version = "6.1.7601.17514"
User Name    char-PC\char
Time Zone    Pacific Standard Time
Installed Physical Memory (RAM)    4.00 GB
Total Physical Memory    4.00 GB
Available Physical Memory    2.66 GB
Total Virtual Memory    7.99 GB
Available Virtual Memory    6.63 GB
Page File Space    4.00 GB
Page File    C:\pagefile.sys

Name    NVIDIA Quadro FX 1700 (Microsoft Corporation - WDDM v1.1)
PNP Device ID    PCI\VEN_10DE&DEV_040F&SUBSYS_049A10DE&REV_A1\4&100C6EED&0&0020
Adapter Type    Quadro FX 1700, NVIDIA compatible
Adapter Description    NVIDIA Quadro FX 1700 (Microsoft Corporation - WDDM v1.1)
Adapter RAM    512.00 MB (536,870,912 bytes)
Installed Drivers    nvd3dumx.dll,nvd3dum,nvwgf2umx.dll, nvwgf2um
Driver Version    8.15.11.8593
INF File    nv_lh.inf (nv_G8x section)
Color Planes    Not Available
Color Table Entries    4294967296
Resolution    1360 x 768 x 60 hertz
Bits/Pixel    32

hope i can do this. i got this last week and was appointed on the card it came with. thanks luna