NVIDIA GeForce 840M vs NVIDIA GeForce GTX 850A

Graphics Processor

GPU model GM108 GM107
GPU variant N15S-GT N15P-GT-A1
Architecture Maxwell Maxwell
Foundry TSMC TSMC
Manufacturing process 28 nm 28 nm
Number of transistors unknown 1,870 million
Die size unknown 148 mm²

Mobile graphics

Release date Mar 12th, 2014 Mar 17th, 2014
Generation GeForce 800M GeForce 800A
Production End-of-life End-of-life
Interface PCIe 3.0 x8 PCIe 3.0 x16
Predecessor GeForce 700M GeForce 700A
Successor GeForce 900M GeForce 900A

Clocks

Base clock 1029 MHz 902 MHz
Boost clock 1124 MHz 936 MHz
Memory clock 1001 MHz 2 Gbps effective 900 MHz 1800 Mbps effective

Memory Configuration

Memory size 2 GB 2 GB
Memory type DDR3 DDR3
Memory bus width 64 bit 128 bit
Bandwidth 16.02 GB/s 28.80 GB/s

Render Configuration

Shading units 384 640
TMUs 16 40
ROPs 8 16
SMM count 3 5
Cache L1 64 KB (per SMM) 64 KB (per SMM)
Cache L2 1024 KB 2 MB

Performance

Pixel rate 8.992 GPixel/s 14.98 GPixel/s
Texture rate 17.98 GTexel/s 37.44 GTexel/s
FP32 (float) performance 863.2 GFLOPS 1,198 GFLOPS
FP64 (double) performance 26.98 GFLOPS (1:32) 37.44 GFLOPS (1:32)

Dimensions & Outputs

Slot width IGP IGP
TDP 33 W 45 W
Outputs No outputs No outputs

API Support & Features

DirectX 12 (11_0) 12 (11_0)
OpenGL 4.6 4.6
OpenCL 3.0 3.0
Vulkan 1.1 1.1
CUDA 5.0 5.0
Shader model 5.1 5.1

Other Features

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