iXBT Labs - ATI RADEON HD 4890 1024MB

Card design

HIS RADEON HD 4890 1024MB
GPU: RADEON HD 4890 (RV790) Interface: PCI-Express x16 GPU frequencies (ROPs/Shaders): 850/850 MHz (nominal) Memory frequencies (physical (effective)): 975 (3900) MHz (nominal) Memory bus width: 256-bit Vertex processors: - Pixel processors: - Unified processors: 800 Texture processors: 40 (BLF/TLF) ROPs: 16 Dimensions: 260x100x33 mm (the last figure is the maximum thickness) PCB color: red RAMDACs/TDMS: integrated into GPU Output connectors: 2xDVI (2xDual-Link/HDMI), S-Video VIVO: not available TV-out: integrated into GPU Multi-GPU operation: Hardware CrossFire
Sapphire RADEON HD 4890 1024MB
GPU: RADEON HD 4890 (RV790) Interface: PCI-Express x16 GPU frequencies (ROPs/Shaders): 850/850 MHz (nominal -- 850/850 MHz) Memory frequencies (physical (effective)): 975 (3900) MHz (nominal -- 975 (3900) MHz) Memory bus width: 256bit Vertex processors: - Pixel processors: - Unified processors: 800 Texture processors: 40 (BLF/TLF) ROPs: 16 Dimensions: 260x100x33 mm (the last figure is maximum thickness of the graphics card). PCB color: red RAMDACs/TDMS: integrated into GPU. Output connectors: 2xDVI (2xDual-Link/HDMI), S-Video. VIVO: not available TV-out: integrated into GPU. Multi-GPU operation: CrossFire (Hardware).
Powercolor RADEON HD 4890 1024MB
GPU: RADEON HD 4890 (RV790) Interface: PCI-Express x16 GPU frequencies (ROPs/Shaders): 850/850 MHz (nominal -- 850/850 MHz) Memory frequencies (physical (effective)): 975 (3900) MHz (nominal -- 975 (3900) MHz) Memory bus width: 256bit Vertex processors: - Pixel processors: - Unified processors: 800 Texture processors: 40 (BLF/TLF) ROPs: 16 Dimensions: 260x100x33 mm (the last figure is maximum thickness of the graphics card). PCB color: red RAMDACs/TDMS: integrated into GPU. Output connectors: 2xDVI (2xDual-Link/HDMI), S-Video. VIVO: not available TV-out: integrated into GPU. Multi-GPU operation: CrossFire (Hardware).

HIS RADEON HD 4890 1024MB Sapphire RADEON HD 4890 1024MB Powercolor RADEON HD 4890 1024MB
Each graphics card has 1024 MB of GDDR5 SDRAM allocated in 8 Qimonda memory chips on the front side of the PCB. These memory chips are designed for the maximum frequency of 1000 (4000) MHz.

Comparison with the reference design, front view
Powercolor RADEON HD 4890 1024MB	Reference card ATI RADEON HD 4870

Sapphire RADEON HD 4890 1024MB

HIS RADEON HD 4890 1024MB

Comparison with the reference design, back view
Powercolor RADEON HD 4890 1024MB	Reference card ATI RADEON HD 4870

Sapphire RADEON HD 4890 1024MB

HIS RADEON HD 4890 1024MB

All three cards are apparently the same reference products manufactured at third-party plants. Partners just buy ready products from the company and add stickers, markings, bundles, packages and support (warranty, etc).

In its turn, the reference RV790 looks very much like the previous RADEON HD 4870. There are only minor differences in the power supply unit and improvements in memory circuitry, since the core has been modified. In fact, only the PCB layout has been optimized.

All cards have original TV-Out interfaces that require a special adapter to output video to a TV set via S-Video or RCA.

All cards require additional power, so each is bundled with a molex to 6-pin adapter, even though all modern PSUs have with such cables.

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)

The HDTV review is available here.

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ATI RADEON HD 4890 1024MB

The most powerful single-GPU card from AMD.

Card design