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AMD Radeon HD 7870M

Heathrow
Graphics Processor
640
Cores
40
TMUs
16
ROPs
2 GB
Memory Size
GDDR5
Memory Type
128 bit
Bus Width
AMD Radeon HD 7870M Photo AMD Heathrow Photo
The Radeon HD 7870M was a graphics card by AMD, launched in April 2012. Built on the 28 nm process, and based on the Heathrow graphics processor, in its Heathrow XT variant, the card supports DirectX 12.0. The Heathrow graphics processor is an average sized chip with a die area of 123 mm² and 1,500 million transistors. It features 640 shading units, 40 texture mapping units and 16 ROPs. AMD has placed 2,048 MB GDDR5 memory on the card, which are connected using a 128-bit memory interface. The GPU is operating at a frequency of 800 MHz, memory is running at 1000 MHz.
Its power draw is rated at 45 W maximum. This device has no display connectivity, as it is not designed to have monitors connected to it. Radeon HD 7870M is connected to the rest of the system using a PCI-Express 3.0 x16 interface.

Graphics Processor

GPU Name
Heathrow
GPU Variant
Heathrow XT
(216-0835033)
Architecture
GCN 1.0
Foundry
TSMC
Process Size
28 nm
Transistors
1,500 million
Die Size
123 mm²

Graphics Card

Release Date
Apr 24th, 2012
Generation
London
(HD 7800M)
Production
End-of-life
Bus Interface
PCIe 3.0 x16

Relative Performance

10%
13%
16%
20%
24%
25%
31%
40%
41%
45%
47%
48%
55%
59%
63%
65%
67%
70%
74%
78%
80%
82%
85%
97%
98%
100%
Radeon HD 7870M
100%
101%
101%
103%
103%
109%
115%
117%
121%
122%
123%
125%
125%
125%
128%
134%
136%
146%
149%
149%
155%
156%
161%
172%
178%
178%
182%
183%
189%
191%
193%
196%
205%
209%
212%
213%
213%
214%
231%
233%
239%
241%
243%
245%
245%
249%
250%
257%
277%
284%
291%
293%
296%
299%
306%
314%
321%
329%
333%
333%
369%
406%
412%
440%
442%
448%
454%
458%
460%
467%
469%
471%
475%
500%
511%
517%
517%
569%
579%
589%
633%
695%
719%
775%
775%
817%
912%
956%
981%
1069%
1216%
Based on TPU review data: "Performance Summary" at 1920x1080
Performance estimated based on architecture, shader count and clocks.

Clock Speeds

GPU Clock
800 MHz
Memory Clock
1000 MHz
4000 MHz effective

Memory

Memory Size
2 GB
Memory Type
GDDR5
Memory Bus
128 bit
Bandwidth
64.00 GB/s

Render Config

Shading Units
640
TMUs
40
ROPs
16
Compute Units
10

Theoretical Performance

Pixel Rate
12.80 GPixel/s
Texture Rate
32.00 GTexel/s
FP32 (float) performance
1,024 GFLOPS
FP64 (double) performance
64.00 GFLOPS (1:16)

Board Design

TDP
45 W
Outputs
No outputs

Graphics Features

DirectX
12.0 (11_1)
OpenGL
4.5
OpenCL
1.2
Vulkan
1.1.86
Shader Model
5.1

Heathrow GPU Notes

Chip Variant: Cape Verde
Graphics/Compute: GFX6 (gfx601)
Display Core Engine: 6.0
Unified Video Decoder: 4.0
Video Compression Engine: 1.0