AMD Radeon HD 6870 X2 vs NVIDIA Quadro K620

Table of Contents

Graphics Processor

GPU model Barts GM107
GPU variant Barts XT (215-0798000) GM107-850-A2
Architecture TeraScale 2 Maxwell
Foundry TSMC TSMC
Manufacturing process 40 nm 28 nm
Number of transistors 1,700 million 1,870 million
Die size 255 mm² 148 mm²

Graphics Card

Release date Jul 8th, 2011 Jul 22nd, 2014
Generation Northern Islands Quadro
Production End-of-life End-of-life
Launch price 520 USD
Interface PCIe 2.0 x16 PCIe 2.0 x16
Reviews 170 in our database 26 in our database
Predecessor Evergreen
Successor Southern Islands

Clocks

GPU clock 900 MHz
Memory clock 1050 MHz 4.2 Gbps effective 900 MHz 1800 Mbps effective
Base clock 1058 MHz
Boost clock 1124 MHz

Memory Configuration

Memory size 1024 MB 2 GB
Memory type GDDR5 DDR3
Memory bus width 256 bit 128 bit
Bandwidth 134.4 GB/s 28.80 GB/s

Render Configuration

Shading units 1120 384
TMUs 56 24
ROPs 32 16
Compute units 14
Cache L1 8 KB (per CU) 64 KB (per SMM)
Cache L2 512 KB 2 MB
SMM count 3

Performance

Pixel rate 28.80 GPixel/s 17.98 GPixel/s
Texture rate 50.40 GTexel/s 26.98 GTexel/s
FP32 (float) performance 2.016 TFLOPS 863.2 GFLOPS
FP64 (double) performance 26.98 GFLOPS (1:32)

Dimensions & Outputs

Slot width Dual-slot Single-slot
Length 304 mm 12 inches 160 mm 6.3 inches
TDP 300 W 45 W
Suggested PSU 700 W 200 W
Outputs 2x DVI1x HDMI2x mini-DisplayPort 1x DVI1x DisplayPort
Width 69 mm 2.7 inches
Power connectors None
Board number P2012

API Support & Features

DirectX 11.2 (11_0) 12 (11_0)
OpenGL 4.4 4.6
OpenCL 1.2 3.0
Vulkan 1.1
Shader model 5.0 5.1
CUDA 5.0

Other Features

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