Home GPU Comparison AMD Radeon R9 285X vs ATI Radeon HD 4870 Mac Edition

AMD Radeon R9 285X vs ATI Radeon HD 4870 Mac Edition

We compared two Desktop platform GPUs: 3GB VRAM Radeon R9 285X 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

AMD Radeon R9 285X 's Advantages
More VRAM (3GB vs 512GB)
Larger VRAM bandwidth (264.0GB/s vs 108.8GB/s)
1248 additional rendering cores
ATI Radeon HD 4870 Mac Edition 's Advantages
Lower TDP (150W vs 200W)

Score

Benchmark

FP32 (float)
Radeon R9 285X +242%
4.104 TFLOPS
Radeon HD 4870 Mac Edition
1.2 TFLOPS
VS

Graphics Card

Unknown
Release Date
Jan 2009
Volcanic Islands
Generation
Radeon R700
Desktop
Type
Desktop
PCIe 3.0 x16
Bus Interface
PCIe 2.0 x16

Clock Speeds

-
-
-
-
-
-
1375 MHz
Memory Clock
850 MHz

Memory

3GB
Memory Size
512MB
GDDR5
Memory Type
GDDR5
384bit
Memory Bus
256bit
264.0GB/s
Bandwidth
108.8GB/s

Render Config

32
Compute Units
10
-
-
-
2048
Shading Units
800
128
TMUs
40
32
ROPs
16
-
-
-
-
-
-
16 KB (per CU)
L1 Cache
16 KB (per CU)
768 KB
L2 Cache
256 KB
-
-
-

Theoretical Performance

32.06 GPixel/s
Pixel Rate
12.00 GPixel/s
128.3 GTexel/s
Texture Rate
30.00 GTexel/s
-
-
-
4.104 TFLOPS
FP32 (float)
1200 GFLOPS
-
FP64 (double)
240.0 GFLOPS

Board Design

200W
TDP
150W
550 W
Suggested PSU
450 W
2x DVI 1x HDMI 1.4a 1x DisplayPort 1.2
Outputs
1x DVI 1x mini-DisplayPort 1.0
1x 6-pin + 1x 8-pin
Power Connectors
2x 6-pin

Graphics Processor

Tonga
GPU Name
RV770
Tonga XT (215-0851313)
GPU Variant
RV770 XT Mac (215-0669080)
GCN 3.0
Architecture
TeraScale
TSMC
Foundry
TSMC
28 nm
Process Size
55 nm
5 billion
Transistors
0.956 billion
366 mm²
Die Size
256 mm²

Graphics Features

12 (12_0)
DirectX
10.1 (10_1)
4.6
OpenGL
3.3
2.0
OpenCL
1.1
1.2
Vulkan
N/A
-
-
-
6.3
Shader Model
4.1

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