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i3DSpeed, December 2009

ATI RADEON HD 4870 X2 2x1024MB DDR5 (750/750/3600 MHz)

Andrey Vorobiev; January 4, 2010.

On the example of the reference ATI RADEON HD 4870 X2 2x1024MB DDR5 (750/750/3600 MHz).

Features:

  • GPU: 2 x RADEON HD 4870 (RV770)
  • 2 x 1024 MB GDDR5 SDRAM in 16 Qimonda chips on both sides; 1000 (4000) MHz peak clock rate
  • Interface: PCI-Express x16
  • GPU (ROPs/Shaders) clock rate: 2 x 750/750 MHz (nominal)
  • Memory clock rate, physical (effective): 900 (3600) MHz (nominal)
  • Bus width: 2 x 256-bit
  • Vertex processors: -
  • Pixel processors: -
  • Unified processors: 2 x 800
  • Texture processors: 2 x 40 (BLF/TLF)
  • ROPs: 2 x 16
  • Size: 275x100x33 mm (the latter is max. width)
  • PCB color: black
  • 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.

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