Home GPU Comparison ATI Mobility Radeon HD 3850 X2 vs AMD Radeon HD 7870M

ATI Mobility Radeon HD 3850 X2 vs AMD Radeon HD 7870M

We compared two Mobile platform GPUs: 512MB VRAM Mobility Radeon HD 3850 X2 and 2GB VRAM Radeon HD 7870M to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 7870M 's Advantages
Released 3 years and 10 months late
More VRAM (2GB vs 512GB)
Larger VRAM bandwidth (64.00GB/s vs 48.00GB/s)
320 additional rendering cores
Lower TDP (45W vs 70W)

Score

Benchmark

FP32 (float)
Mobility Radeon HD 3850 X2
0.371 TFLOPS
Radeon HD 7870M +176%
1.024 TFLOPS
VS

Graphics Card

Jun 2008
Release Date
Apr 2012
M8x
Generation
London
Mobile
Type
Mobile
PCIe 2.0 x16
Bus Interface
PCIe 3.0 x16

Clock Speeds

-
-
-
-
-
-
750 MHz
Memory Clock
1000 MHz

Memory

512MB
Memory Size
2GB
GDDR3
Memory Type
GDDR5
256bit
Memory Bus
128bit
48.00GB/s
Bandwidth
64.00GB/s

Render Config

4
Compute Units
10
-
-
-
320
Shading Units
640
16
TMUs
40
16
ROPs
16
-
-
-
-
-
-
-
L1 Cache
16 KB (per CU)
256 KB
L2 Cache
256 KB
-
-
-

Theoretical Performance

9.280 GPixel/s
Pixel Rate
12.80 GPixel/s
9.280 GTexel/s
Texture Rate
32.00 GTexel/s
-
-
-
371.2 GFLOPS
FP32 (float)
1024 GFLOPS
74.24 GFLOPS
FP64 (double)
64.00 GFLOPS

Board Design

70W
TDP
45W
-
-
-
No outputs
Outputs
No outputs
-
-
-

Graphics Processor

M88
GPU Name
Heathrow
-
GPU Variant
Heathrow XT (216-0835033)
TeraScale
Architecture
GCN 1.0
TSMC
Foundry
TSMC
55 nm
Process Size
28 nm
0.666 billion
Transistors
1.5 billion
192 mm²
Die Size
123 mm²

Graphics Features

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

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