Home GPU Comparison AMD Radeon HD 7970 vs AMD Radeon HD 6870 1600SP Edition

AMD Radeon HD 7970 vs AMD Radeon HD 6870 1600SP Edition

We compared two Desktop platform GPUs: 3GB VRAM Radeon HD 7970 and 1024MB VRAM Radeon HD 6870 1600SP Edition to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 7970 's Advantages
More VRAM (3GB vs 1024GB)
Larger VRAM bandwidth (264.0GB/s vs 134.4GB/s)
448 additional rendering cores
AMD Radeon HD 6870 1600SP Edition 's Advantages
Released 1 years and 1 months late
Lower TDP (175W vs 250W)

Score

Benchmark

FP32 (float)
Radeon HD 7970 +39%
3.789 TFLOPS
Radeon HD 6870 1600SP Edition
2.72 TFLOPS
VS

Graphics Card

Dec 2011
Release Date
Jan 2013
Southern Islands
Generation
Northern Islands
Desktop
Type
Desktop
PCIe 3.0 x16
Bus Interface
PCIe 2.0 x16

Clock Speeds

-
-
-
-
-
-
1375 MHz
Memory Clock
1050 MHz

Memory

3GB
Memory Size
1024MB
GDDR5
Memory Type
GDDR5
384bit
Memory Bus
256bit
264.0GB/s
Bandwidth
134.4GB/s

Render Config

32
Compute Units
20
-
-
-
2048
Shading Units
1600
128
TMUs
80
32
ROPs
32
-
-
-
-
-
-
16 KB (per CU)
L1 Cache
8 KB (per CU)
768 KB
L2 Cache
512 KB
-
-
-

Theoretical Performance

29.60 GPixel/s
Pixel Rate
27.20 GPixel/s
118.4 GTexel/s
Texture Rate
68.00 GTexel/s
-
-
-
3.789 TFLOPS
FP32 (float)
2.720 TFLOPS
947.2 GFLOPS
FP64 (double)
544.0 GFLOPS

Board Design

250W
TDP
175W
600 W
Suggested PSU
450 W
1x DVI 1x HDMI 1.4a 2x mini-DisplayPort 1.2
Outputs
2x DVI 1x HDMI 1.3a 2x mini-DisplayPort 1.1
1x 6-pin + 1x 8-pin
Power Connectors
2x 6-pin

Graphics Processor

Tahiti
GPU Name
Cypress
Tahiti XT (215-0821060)
GPU Variant
Cypress XT (215-0735033)
GCN 1.0
Architecture
TeraScale 2
TSMC
Foundry
TSMC
28 nm
Process Size
40 nm
4.313 billion
Transistors
2.154 billion
352 mm²
Die Size
334 mm²

Graphics Features

12 (11_1)
DirectX
11.2 (11_0)
4.6
OpenGL
4.4
1.2
OpenCL
1.2
1.2
Vulkan
N/A
-
-
-
5.1
Shader Model
5.0

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