AMD Radeon HD 6850 vs NVIDIA GeForce GT 645 OEM

Table of Contents

Graphics Processor

GPU model Barts GF114
GPU variant Barts PRO (215-0798006)
Architecture TeraScale 2 Fermi 2.0
Foundry TSMC TSMC
Manufacturing process 40 nm 40 nm
Number of transistors 1,700 million 1,950 million
Die size 255 mm² 332 mm²

Graphics Card

Release date Oct 21st, 2010 Apr 24th, 2012
Generation Northern Islands GeForce 600
Production End-of-life End-of-life
Launch price 179 USD
Interface PCIe 2.0 x16 PCIe 2.0 x16
Reviews 105 in our database
Predecessor Evergreen GeForce 500
Successor Southern Islands GeForce 700

Clocks

GPU clock 775 MHz 776 MHz
Memory clock 1000 MHz 4 Gbps effective 957 MHz 3.8 Gbps effective
Shader clock 1552 MHz

Memory Configuration

Memory size 1024 MB 1024 MB
Memory type GDDR5 GDDR5
Memory bus width 256 bit 192 bit
Bandwidth 128.0 GB/s 91.87 GB/s

Render Configuration

Shading units 960 288
TMUs 48 48
ROPs 32 24
Compute units 12
Cache L1 8 KB (per CU) 64 KB (per SM)
Cache L2 512 KB 384 KB
SM count 6

Performance

Pixel rate 24.80 GPixel/s 9.312 GPixel/s
Texture rate 37.20 GTexel/s 37.25 GTexel/s
FP32 (float) performance 1,488 GFLOPS 894.0 GFLOPS
FP64 (double) performance 74.50 GFLOPS (1:12)

Dimensions & Outputs

Slot width Dual-slot Dual-slot
Length 198 mm 7.8 inches 210 mm 8.3 inches
TDP 127 W 102 W
Suggested PSU 300 W 300 W
Outputs 2x DVI1x HDMI2x mini-DisplayPort 2x DVI1x mini-HDMI
Power connectors 1x 6-pin
Board number C223

API Support & Features

DirectX 11.2 (11_0) 12 (11_0)
OpenGL 4.4 4.6
OpenCL 1.2 1.1
Vulkan
Shader model 5.0 5.1
CUDA 2.1

Other Features

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