Home GPU Comparison AMD Radeon HD 8870 OEM vs ATI Radeon HD 4855

AMD Radeon HD 8870 OEM vs ATI Radeon HD 4855

We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 8870 OEM and 512MB VRAM Radeon HD 4855 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 8870 OEM 's Advantages
Released 3 years late
More VRAM (2GB vs 512GB)
Larger VRAM bandwidth (153.6GB/s vs 115.2GB/s)
640 additional rendering cores
ATI Radeon HD 4855 's Advantages
Lower TDP (110W vs 175W)

Score

Benchmark

FP32 (float)
Radeon HD 8870 OEM +247%
2.56 TFLOPS
Radeon HD 4855
0.736 TFLOPS
VS

Graphics Card

Jan 2013
Release Date
Jan 2010
Sea Islands
Generation
Radeon R700
Desktop
Type
Desktop
PCIe 3.0 x16
Bus Interface
PCIe 2.0 x16

Clock Speeds

-
-
-
-
-
-
1200 MHz
Memory Clock
900 MHz

Memory

2GB
Memory Size
512MB
GDDR5
Memory Type
GDDR5
256bit
Memory Bus
256bit
153.6GB/s
Bandwidth
115.2GB/s

Render Config

20
Compute Units
8
-
-
-
1280
Shading Units
640
80
TMUs
32
32
ROPs
16
-
-
-
-
-
-
16 KB (per CU)
L1 Cache
16 KB (per CU)
512 KB
L2 Cache
256 KB
-
-
-

Theoretical Performance

32.00 GPixel/s
Pixel Rate
9.200 GPixel/s
80.00 GTexel/s
Texture Rate
18.40 GTexel/s
-
-
-
2.560 TFLOPS
FP32 (float)
736.0 GFLOPS
160.0 GFLOPS
FP64 (double)
147.2 GFLOPS

Board Design

175W
TDP
110W
450 W
Suggested PSU
300 W
1x DVI 1x HDMI 1.4a 2x mini-DisplayPort 1.2
Outputs
1x DVI 1x HDMI 1.3a 1x VGA
2x 6-pin
Power Connectors
1x 6-pin

Graphics Processor

Pitcairn
GPU Name
RV770
Pitcairn XT (215-0828047)
GPU Variant
RV770 PRO (215-0669065)
GCN 1.0
Architecture
TeraScale
TSMC
Foundry
TSMC
28 nm
Process Size
55 nm
2.8 billion
Transistors
0.956 billion
212 mm²
Die Size
256 mm²

Graphics Features

12 (11_1)
DirectX
10.1 (10_1)
4.6
OpenGL
3.3
1.2
OpenCL
1.1
1.2
Vulkan
N/A
-
-
-
5.1
Shader Model
4.1

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