iXBT Labs - Computer Hardware in Detail






i3DSpeed, December 2009

ATI RADEON HD 4850 1024MB DDR3 (625/625/2000 MHz)

Andrey Vorobiev; January 4, 2010.

On the example of Sapphire RADEON HD 4850 1024MB DDR3 (625/625/2000 MHz).


  • GPU: RADEON HD 4850 (RV770)
  • 1024 MB GDDR3 SDRAM in 8 Hynix chips on the front side; 1200 (2400) MHz peak clock rate
  • Interface: PCI-Express x16
  • GPU (ROPs/Shaders) clock rate: 625/625 MHz (nominal)
  • Memory clock rate, physical (effective): 990 (1980) MHz (1000 (2000) MHz nominal)
  • Bus width: 256-bit
  • Vertex processors: -
  • Pixel processors: -
  • Unified processors: 800
  • Texture processors: 40 (BLF/TLF)
  • ROPs: 16
  • Size: 220x100x16 mm (the latter is max. width)
  • PCB color: blue
  • RAMDACs/TDMS: integrated into GPU
  • Outputs: 2 x DVI (Dual-Link/HDMI), TV-out (integrated into GPU)
  • VIVO: -
  • Multi-GPU: Hardware CrossFire

This card features an audio codec that is output via a DVI-to-HDMI adapter.

This card features an original TV-Out interface, so an adapter is required to output video via S-Video or RCA. Such adapters are usually bundled.

This card requires a DVI-to-D-Sub adapter to be connected to an analog monitor with a D-Sub interface.

Maximum resolutions and frequencies:

  • 240 Hz maximum refresh rate
  • 2048 x 1536 x 32bit @ 85Hz Max - analog interface
  • 2560 x 1600 @ 60Hz Max - digital interface (all Dual-Link DVIs)

MPEG2 playback (DVD-Video) was analyzed back in 2002 and little has changed since that time. Modern graphics cards do not load CPUs during video playback by more than 25%.

The HDTV review is available here.

We thank Sapphire
for the provided graphics card.

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