ATI Radeon HD 3850 X3 vs NVIDIA GeForce GT 620M

Edit	ATI Radeon HD 3850 X3 Check Price	NVIDIA GeForce GT 620M Check Price

Table of Contents

Graphics Processor
Graphics Card
Clocks
Memory Configuration
Render Configuration
Performance
Dimensions & Outputs
API Support & Features
Other Features
Mobile graphics

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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