Radeon HD 6870 X2 

Released July, 2011
  • 900 MHz
  • 2 GB GDDR5
In terms of clock speeds the card follows the frequencies set out by the HD 6870 reference design - just with two GPUs crammed onto a single PCB.
by techPowerUp! (Jul, 2011)
Once we set 1.35 V the card managed to beat the 1000 MHz barrier, but temperatures were getting quite high.
by techPowerUp! (Jul, 2011)

Features Key features of the Radeon HD 6870 X2

memory bandwidth Rate at which data can be read from or stored in onboard memory

Radeon HD 6870 X2
268.8 GB/s
Radeon HD 8770
96 GB/s
Radeon R9 280X
288 GB/s

pixel rate Number of pixels a graphics card can render to the screen every second

Radeon HD 6870 X2
57.6 GPixel/s
Radeon HD 8770
16.8 GPixel/s
Radeon R9 280X
32 GPixel/s

texture rate Speed at which a graphics card can perform texture mapping

Radeon HD 6870 X2
100.8 GTexel/s
Radeon HD 8770
58.8 GTexel/s
Radeon R9 280X
128 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6870 X2
4,032 GFLOPS
Radeon HD 8770
1,881.6 GFLOPS
Radeon R9 280X
4,096 GFLOPS

shading units Subcomponents of the gpu, these run in parallel to enable fast pixel shading

Radeon HD 6870 X2
2,240

texture mapping units Built into each gpu, these resize and rotate bitmaps for texturing scenes

Radeon HD 6870 X2
112

Reviews Word on the street for the Radeon HD 6870 X2


9.1
Memory is overclocking very well thanks to the highly overclockable Elpida memory chips.

What People Are Saying Give it to me straight

Applications

During 3D gaming the card requires about the amount of power you would expect from a card in its performance class.
by techPowerUp! (Jul, 2011)
Like all dual GPU designs the card suffers from increased power consumption in idle, multi-monitor and Blu-ray playback.
by techPowerUp! (Jul, 2011)
In idle and during Blu-ray playback the card consumes massive amounts of power which is just not acceptable in the year 2011.
by techPowerUp! (Jul, 2011)

Performance

Under load, noise levels are more in line with what other high-end accelerators offer today, actually below many of the high-end models.
by techPowerUp! (Jul, 2011)
Whiel certainly not being quiet, under load the card emits acceptable noise levels when taking into account its performance class.
by techPowerUp! (Jul, 2011)
When taking performance into account the card actually becomes the best price/performance card in the high-end segment, yet I would like to see lower pricing, definitely below $500 to make this card attractive to more buyers.
by techPowerUp! (Jul, 2011)

Memory

HD 6870 X2 uses a Lucid PCI-Express bridge chip, fast Elpida memory and an excellent CPL PWM circuitry.
by techPowerUp! (Jul, 2011)
The GDDR5 memory chips are made by Elpida, and carry the model number W1032BABG-50-F.
by techPowerUp! (Jul, 2011)
Memory overclocking worked very well thanks to the Elpida GDDR5 memory which has amazing overclocking potential.
by techPowerUp! (Jul, 2011)

Gaming

During 3D gaming, power consumption is reasonable.
by techPowerUp! (Jul, 2011)

Displays

This approach enables the PowerColor HD 6870 X2 to end up being classified as high-end graphics card, delivering performance catered to 2560x1600 resolutions or multi-screen setups.
by techPowerUp! (Jul, 2011)

Specifications Full list of technical specs

gpu

GPU brand AMD
GPU name Barts XT
Market Desktop
Clock speed 900 MHz
Is dual GPU Yes
Reference card None

raw performance

Shading units 2,240
Texture mapping units 112
Render output processors 64
Compute units 28
Pixel rate 57.6 GPixel/s
Texture rate 100.8 GTexel/s
Floating-point performance 4,032 GFLOPS

memory

Memory clock speed 1,050 MHz
Effective memory clock speed 4,200 MHz
Memory bus 512 bit
Memory 2,048 MB
Memory type GDDR5
Memory bandwidth 268.8 GB/s

noise and power

TDP 300W
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