What kind of video card do I have in my computer?

I've tried Everest, PC WIzard, system information, and the device manager but the most specific information I can get is
ATI Radeon HD 4800 Series
512 MB
How can I tell if it's a 4850, 4870, or 4830?

There must be something I'm overlooking.

Thanks.

Full specs below:
________________________________________________________


General Information :       
Manufacturer :      ATI Technologies Inc  (PC Partner Ltd)
Model :      ATI Radeon HD 4800 Series
Bus Type :      PCI-Express
Total Memory :      512 MB
Texture Memory :      1013 MB
Processor :      ATI Radeon Graphics Processor (0x9440)
Converter :      Internal DAC(400MHz)
Refresh Rate (min/max) :      56/75 Hz

 GPU Information :       
Number of GPU :      1
Codename :      RV770
Bus :      256-bit
HD Support :      Yes
Memory Type :      SDRAM
GPU Frequency :      750 MHz - [initial : 750 MHz]
Memory Frequency GPU :      900 MHz - [initial : 900 MHz]
DirectX Support :      10.1
Pixel Shader Version :      3.0

 GPU Configuration :       
Technology CrossFire :      No

 Video Bios Information :       
Date :      09/26/08
ID :      113-BA0701-X07
Catalyst :      8.573.0.0

 General Features :       
Width :      320 mm
Height :      240 mm
Pixel per inch :      96x96 dpi
bits per pixel :      32
Colour Bits/Planes :      1
Brushes :      4294967295
Pens :      4294967295
Markers :      0
Device Fonts :      0
Device Colours :      4294967295
Clip Output to Rectangle :      Yes
Hardware Acceleration :      Yes

 Blend and Shade Capabilities :       
GradientFill Rectangle :      No
GradientFill Traingle :      No
Per Pixel AlphaBlend :      Yes
Premultiplied Alpha :      No

 Raster Capabilities :       
Banding :      No
Transfer Bitmaps :      Yes
Bitmap >64 KB :      Yes
Fonts larger than 64 K :      Yes
DIBs :      Yes
DIBTODEV :      Yes
Flood Fills :      Yes
Scaling :      No
StretchBlt :      Yes
StretchDIB :      Yes

 Curves Capabilities :       
Chord Arcs :      Yes
Circles :      Yes
Elipses :      Yes
Interiors :      Yes
Pie Wedges :      Yes
Rounded Rectangles :      Yes
Styled Borders :      Yes
Wide Borders :      Yes
Wide, Styled Borders :      Yes

 Lines Capabilities :       
Interiors :      Yes
Markers :      Yes
Polylines :      Yes
Polymarkers :      Yes
Styled :      Yes
Wide :      Yes
Wide, Styled :      Yes

 Polygonal Capabilities :       
Interiors :      Yes
Alternate Fill Polygons :      Yes
Winding Fill Polygons :      Yes
Rectangles :      Yes
Scan Lines :      Yes
Styled Borders :      Yes
Wide Borders :      Yes
Wide, Styled Borders :      Yes

 Text Capabilities :       
Stroke Precision :      Yes
Stroke Clip Precision :      Yes
90° Character Rotation :      No
Any Angle Character Rotation :      No
Independent X-Y Scaling :      No
Double Weighted Characters :      No
Italic :      No
Underline :      Yes
Strikeout :      Yes
Raster Fonts :      Yes
Vector Fonts :      Yes

 Color Management Capabilities :       
CMYK :      No
Gamma Ramp :      Yes
ICM Device :      No


Field      Value
Device Properties      
Driver Description      ATI Radeon HD 4800 Series
Driver Date      1/13/2009
Driver Version      8.573.0.0
Driver Provider      ATI Technologies Inc.
INF File      oem10.inf
Hardware ID      PCI\VEN_1002&DEV_9440&SUBSYS_E850174B&REV_00
Location Information      PCI bus 1, device 0, function 0
PCI Device      ATI Radeon HD 4800 Series [1002-9440] [NoDB]
      
Device Resources      
IRQ      16
Memory      000A0000-000BFFFF
Memory      C0000000-CFFFFFFF
Memory      D0200000-D020FFFF
Port      03B0-03BB
Port      03C0-03DF
Port      3000-30FF

untitled.PNG