i3DSpeed, January 2009
ATI RADEON HD 4870 X2 2x1024MB DDR5 (790/790/4000 MHz)
Andrey Vorobiev; February 9, 2009.
On the example of Gainward Rampage 700 GLH (RADEON HD 4870 X2) 2x1024MB.
- 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: 790/790 MHz (750/750 MHz nominal)
- Memory clock rate, physical (effective): 950 (3800) MHz (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: 270x100x47 mm (the latter is max. width)
- PCB color: red
- RAMDACs/TDMS: integrated into GPU
- Outputs: DVI (Dual-Link), HDMI, VGA, DisplayPort
- VIVO: -
- Multi-GPU: Hardware CrossFire
Needless to say, the card has been fully customized. It only resembles the reference by GPU and memory layout.
This card is huge, so have in mind that it'll need three motherboard slots.
Also note that this X2 modification has no TV-Out.
A d-Sub (VGA) monitor can be connected either directly or via a DVI-to-d-Sub adapter. There are also HDMI and DisplayPort interfaces, so there's no need in DVI-to-HDMI adapters.
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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