Sapphire HD 4850 PCI-E Graphics card with 512mb 
Used but in good working condition. 
I tested it for several hours playing Mass Effect 2 and it had no issues.
I will ship in a static bag and well protected in bubble wrap.

Any questions, please ask!

From the Manufacturer:

Model
BrandSAPPHIRE
Model102-B50102
Interface
Interface PCI Express 2.0 x16
Chipset
Chipset ManufacturerAMD
GPU Radeon HD 4850
Core Clock 625 MHz
Stream Processors 800 Stream Processors
Memory
Effective Memory Clock 1986MHz
Memory Size512MB
Memory Interface 256-Bit
Memory TypeGDDR3
3D API
DirectX DirectX 10.1
OpenGL OpenGL 2.1
Ports
HDMI 0
DVI 2 x DVI
TV-OutHDTV / S-Video Out
Details
RAMDAC 400MHz
Max Resolution2560 x 1600
CrossFireX SupportYes
CoolerWith Fan
System RequirementsPCI Express based PC is required with one X16 lane graphics slot available on the motherboard
450 Watt or greater power supply with 75 Watt 6-pin PCI Express power connector recommended (550 Watt and two 6-pin connectors for ATI CrossFireX technology in dual mode)
Certified power supplies are recommended. Refer to http://ati.amd.com/certifiedPSUfor a list of Certified products
1GB of system memory
Installation software requires CD-ROM drive
DVD playback requires DVD drive
Blu-ray / HD DVD playback requires Blu-ray / HD DVD drive
Power Connector6-Pin
Dual-Link DVI SupportedYes
Windows VistaCertified for Windows Vista
HDCP Ready Yes