AMD Radeon HD 7870 XT vs AMD Radeon HD 6850
GPU · Specs Compare
Graphics Card
Release Date
Nov 2012
Oct 2010
Generation
Southern Islands
Northern Islands
Type
Desktop
Desktop
Bus Interface
PCIe 3.0 x16
PCIe 2.0 x16
Clock Speeds
Base Clock
925 MHz
—
Boost Clock
975 MHz
—
Memory Clock
1500 MHz
1000 MHz
Memory
Memory Size
2GB
1024MB
Memory Type
GDDR5
GDDR5
Memory Bus
256bit
256bit
Bandwidth
192.0GB/s
128.0GB/s
Render Config
Compute Units
24
12
Shading Units
1536
960
TMUs
96
48
ROPs
32
32
L1 Cache
16 KB (per CU)
8 KB (per CU)
L2 Cache
512 KB
512 KB
Theoretical Performance
Pixel Rate
31.20 GPixel/s
24.80 GPixel/s
Texture Rate
93.60 GTexel/s
37.20 GTexel/s
FP32 (float)
2.995 TFLOPS
1488 GFLOPS
FP64 (double)
748.8 GFLOPS
—
Graphics Processor
GPU Name
Tahiti
Barts
GPU Variant
Tahiti LE(215-0821122)
Barts PRO(215-0798006)
Architecture
GCN 1.0
TeraScale 2
Foundry
TSMC
TSMC
Process Size
28 nm
40 nm
Transistors
4.313 billion
1.7 billion
Die Size
352 mm²
255 mm²
Board Design
TDP
185W
127W
Suggested PSU
450 W
300 W
Outputs
1x DVI1x HDMI 1.4a2x mini-DisplayPort 1.2
2x DVI1x HDMI 1.3a2x mini-DisplayPort 1.1
Power Connectors
2x 6-pin
1x 6-pin
Graphics Features
DirectX
12 (11_1)
11.2 (11_0)
OpenGL
4.6
4.4
OpenCL
1.2
1.2
Vulkan
1.2
N/A
Shader Model
5.1
5.0
▲ Specs Compare
Data sourced from official specifications and benchmark tests.