GPU Comparison
RADEON
AMD Radeon HD 7970
CORE STATE
Tahiti
VRAM
3 GB
CLOCK SPEED
—
TDP
250 W
BUS WIDTH
384 bit
ARCHITECTURE
GCN 1.0
PROCESS
28 nm
LAUNCH DATE
2012
VS
GEFORCE
GeForce 840M
CORE STATE
GM108S
VRAM
2 GB
CLOCK SPEED
1124 MHz
TDP
33 W
BUS WIDTH
64 bit
ARCHITECTURE
Maxwell
PROCESS
28 nm
LAUNCH DATE
2014
PERFORMANCE BENCHMARKS
geekbench_opencl
geekbench_vulkan
DETAILED SPECIFICATIONS
SPECIFICATION
HD 7970
840M
Core Specs
Shading Units
2,048
384
-81.3%
Shaders
2,048
384
-81.3%
TMUs
128
16
-87.5%
ROPs
32
8
-75.0%
Compute Units
32
—
Clocks
Base Clock
—
1029 MHz
Boost Clock
—
1124 MHz
GPU Clock
925 MHz
—
Memory Clock
1375 MHz
5.5 Gbps effective
1001 MHz
2 Gbps effective
Memory
Memory Size
3 GB
2 GB
VRAM (MB)
3,072
2,048
-33.3%
Memory Type
GDDR5
DDR3
Memory Bus
384 bit
64 bit
Bandwidth
264.0 GB/s
16.02 GB/s
Cache
L1 Cache
16 KB (per CU)
64 KB (per SMM)
L2 Cache
768 KB
1024 KB
Performance
Pixel Rate
29.60 GPixel/s
8.992 GPixel/s
Texture Rate
118.4 GTexel/s
17.98 GTexel/s
FP32 (TFLOPS)
3.789 TFLOPS
863.2 GFLOPS
FP64 (TFLOPS)
947.2 GFLOPS (1:4)
26.98 GFLOPS (1:32)
Power
TDP
250 W
33 W
TDP (W)
250
33
-86.8%
Suggested PSU
600 W
—
Power Connectors
1x 6-pin + 1x 8-pin
None
Architecture
Architecture
GCN 1.0
Maxwell
GPU Name
Tahiti
GM108S
Generation
Southern Islands
(HD 7900)
GeForce 800M
Process Size
28 nm
28 nm
Transistors
4,313 million
1,020 million
Die Size
352 mm²
77 mm²
Foundry
TSMC
TSMC
Density
12.3M / mm²
13.2M / mm²
API Support
DirectX
12 (11_1)
12 (11_0)
OpenGL
4.6
4.6
Vulkan
1.2.170
1.4
OpenCL
2.1 (1.2)
3.0
CUDA
—
5.0
Shader Model
6.5 (5.1)
6.7 (5.1)
Physical
Slot Width
Dual-slot
IGP
Length
275 mm
10.8 inches
—
Height
111 mm
4.4 inches
—
Outputs
1x DVI1x HDMI 1.4a2x mini-DisplayPort 1.2
Portable Device Dependent
Bus Interface
PCIe 3.0 x16
PCIe 3.0 x8
Other
Launch Price
549 USD
—
Production
End-of-life
End-of-life
Predecessor
Northern Islands
GeForce 700M
Successor
Sea Islands
GeForce 900M