Radeon HD 6870 vs Radeon HD 4870 Mac Edition
We compared two Desktop platform GPUs: 1024MB VRAM Radeon HD 6870 and 512MB VRAM Radeon HD 4870 Mac Edition to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.
Main Differences
Radeon HD 6870 's Advantages
Released 1 years and 9 months late
More VRAM (1024GB vs 512GB)
Larger VRAM bandwidth (134.4GB/s vs 108.8GB/s)
320 additional rendering cores
Radeon HD 4870 Mac Edition 's Advantages
Lower TDP (150W vs 151W)
Score
Benchmark
FP32 (float)
Radeon HD 6870
+68%
2016
Radeon HD 4870 Mac Edition
1200
Graphics Card
Oct 2010
Release Date
Jan 2009
Northern Islands
Generation
Radeon R700
Desktop
Type
Desktop
PCIe 2.0 x16
Bus Interface
PCIe 2.0 x16
Clock Speeds
1050 MHz
Memory Clock
850 MHz
Memory
1024MB
Memory Size
512MB
GDDR5
Memory Type
GDDR5
256bit
Memory Bus
256bit
134.4GB/s
Bandwidth
108.8GB/s
Render Config
14
Compute Units
10
1120
Shading Units
800
56
TMUs
40
32
ROPs
16
8 KB (per CU)
L1 Cache
16 KB (per CU)
512 KB
L2 Cache
256 KB
Theoretical Performance
28.80 GPixel/s
Pixel Rate
12.00 GPixel/s
50.40 GTexel/s
Texture Rate
30.00 GTexel/s
2.016 TFLOPS
FP32 (float)
1200 GFLOPS
-
FP64 (double)
240.0 GFLOPS
Board Design
151W
TDP
150W
450 W
Suggested PSU
450 W
2x DVI
1x HDMI 1.3a
2x mini-DisplayPort 1.1
Outputs
1x DVI
1x mini-DisplayPort 1.0
2x 6-pin
Power Connectors
2x 6-pin
Graphics Processor
Barts
GPU Name
RV770
Barts XT
(215-0798000)
GPU Variant
RV770 XT Mac
(215-0669080)
TeraScale 2
Architecture
TeraScale
TSMC
Foundry
TSMC
40 nm
Process Size
55 nm
1.7 billion
Transistors
0.956 billion
255 mm²
Die Size
256 mm²
Graphics Features
11.2 (11_0)
DirectX
10.1 (10_1)
4.4
OpenGL
3.3
1.2
OpenCL
1.1
N/A
Vulkan
N/A
5.0
Shader Model
4.1
