ATI Radeon HD 3850 X3 vs NVIDIA GeForce GT 620M

Table of Contents

Graphics Processor

GPU model RV670 GF108
GPU variant RV670 PRO (215-0708003) N13P-GLP-A1
Architecture TeraScale Fermi
Foundry TSMC TSMC
Manufacturing process 55 nm 40 nm
Number of transistors 666 million 585 million
Die size 192 mm² 116 mm²

Graphics Card

Release date Never Released
Generation Radeon R600
Production End-of-life
Interface PCIe 2.0 x16
Predecessor Radeon R500 PCIe
Successor Radeon R700

Clocks

GPU clock 669 MHz 660 MHz
Memory clock 850 MHz 1700 Mbps effective 900 MHz 1800 Mbps effective
Shader clock 1320 MHz

Memory Configuration

Memory size 512 MB 1024 MB
Memory type GDDR3 DDR3
Memory bus width 256 bit 128 bit
Bandwidth 54.40 GB/s 28.80 GB/s

Render Configuration

Shading units 320 96
TMUs 16 16
ROPs 16 4
Compute units 4
Cache L2 256 KB 256 KB
SM count 2
Cache L1 64 KB (per SM)

Performance

Pixel rate 10.70 GPixel/s 2.640 GPixel/s
Texture rate 10.70 GTexel/s 10.56 GTexel/s
FP32 (float) performance 428.2 GFLOPS 253.4 GFLOPS
FP64 (double) performance 21.12 GFLOPS (1:12)

Dimensions & Outputs

Slot width Dual-slot
Length 292 mm 11.5 inches
TDP 145 W 15 W
Suggested PSU 300 W
Outputs 4x DVI No outputs
Power connectors 1x 8-pin

API Support & Features

DirectX 10.1 (10_1) 12 (11_0)
OpenGL 3.3 (full) 4.0 (partial) 4.6
OpenCL 1.1
Vulkan
Shader model 4.1 5.1
CUDA 2.1

Other Features

Mobile graphics

Release date Aug 23rd, 2012
Generation GeForce 600M
Production End-of-life
Interface PCIe 2.0 x16
Predecessor GeForce 500M
Successor GeForce 700M

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