GPU Comparison
GEFORCE
NVIDIA 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
VS
GEFORCE
GRID K2
CORE STATE
GK104
VRAM
4 GB
CLOCK SPEED
—
TDP
225 W
BUS WIDTH
256 bit
ARCHITECTURE
Kepler
PROCESS
28 nm
LAUNCH DATE
2013
PERFORMANCE BENCHMARKS
geekbench_opencl
geekbench_vulkan
geekbench_metal
DETAILED SPECIFICATIONS
SPECIFICATION
840M
GRID K2
Core Specs
Shading Units
384
1,536
+300.0%
Shaders
384
1,536
+300.0%
TMUs
16
128
+700.0%
ROPs
8
32
+300.0%
Clocks
Base Clock
1029 MHz
—
Boost Clock
1124 MHz
—
GPU Clock
—
745 MHz
Memory Clock
1001 MHz
2 Gbps effective
1250 MHz
5 Gbps effective
Memory
Memory Size
2 GB
4 GB
VRAM (MB)
2,048
4,096
+100.0%
Memory Type
DDR3
GDDR5
Memory Bus
64 bit
256 bit
Bandwidth
16.02 GB/s
160.0 GB/s
Cache
L1 Cache
64 KB (per SMM)
16 KB (per SMX)
L2 Cache
1024 KB
512 KB
Performance
Pixel Rate
8.992 GPixel/s
23.84 GPixel/s
Texture Rate
17.98 GTexel/s
95.36 GTexel/s
FP32 (TFLOPS)
863.2 GFLOPS
2.289 TFLOPS
FP64 (TFLOPS)
26.98 GFLOPS (1:32)
95.36 GFLOPS (1:24)
Power
TDP
33 W
225 W
TDP (W)
33
225
+581.8%
Suggested PSU
—
550 W
Power Connectors
None
1x 6-pin + 1x 8-pin
Architecture
Architecture
Maxwell
Kepler
GPU Name
GM108S
GK104
Generation
GeForce 800M
GRID
(K2)
Process Size
28 nm
28 nm
Transistors
1,020 million
3,540 million
Die Size
77 mm²
294 mm²
Foundry
TSMC
TSMC
Density
13.2M / mm²
12.0M / mm²
API Support
DirectX
12 (11_0)
12 (11_0)
OpenGL
4.6
4.6
Vulkan
1.4
1.2.175
OpenCL
3.0
3.0
CUDA
5.0
3.0
Shader Model
6.7 (5.1)
6.5 (5.1)
Physical
Slot Width
IGP
Dual-slot
Length
—
267 mm
10.5 inches
Outputs
Portable Device Dependent
No outputs
Bus Interface
PCIe 3.0 x8
PCIe 3.0 x16
Other
Launch Price
—
5,199 USD
Production
End-of-life
End-of-life
Predecessor
GeForce 700M
—
Successor
GeForce 900M
—