ATI Radeon HD 3850 vs NVIDIA GeForce 7900 GX2

Table of Contents

Graphics Processor

GPU model RV670 G71
GPU variant RV670 PRO (215-0708003)
Architecture TeraScale Curie
Foundry TSMC TSMC
Manufacturing process 55 nm 90 nm
Number of transistors 666 million 278 million
Die size 192 mm² 196 mm²

Graphics Card

Release date Nov 19th, 2007 Apr 30th, 2006
Generation Radeon R600 GeForce 7 PCIe
Production End-of-life End-of-life
Launch price 179 USD 599 USD
Interface PCIe 2.0 x16 PCIe 1.0 x16
Reviews 71 in our database 145 in our database
Predecessor Radeon R500 PCIe GeForce 6 PCIe
Successor Radeon R700 GeForce 8

Clocks

GPU clock 668 MHz 500 MHz
Memory clock 830 MHz 1660 Mbps effective 600 MHz 1200 Mbps effective

Memory Configuration

Memory size 512 MB 512 MB
Memory type GDDR3 GDDR3
Memory bus width 256 bit 256 bit
Bandwidth 53.12 GB/s 38.40 GB/s

Render Configuration

Shading units 320
TMUs 16 24
ROPs 16 16
Compute units 4
Cache L2 256 KB
Pixel shaders 24
Vertex shaders 8

Performance

Pixel rate 10.69 GPixel/s 8.000 GPixel/s
Texture rate 10.69 GTexel/s 12.00 GTexel/s
FP32 (float) performance 427.5 GFLOPS
FP64 (double) performance 85.50 GFLOPS (1:5)
Vertex rate 1.000 GVertices/s

Dimensions & Outputs

Slot width Single-slot Dual-slot
Length 208 mm 8.2 inches 312 mm 12.3 inches
TDP 75 W 110 W
Suggested PSU 250 W 300 W
Outputs 2x DVI1x S-Video 2x DVI1x S-Video
Power connectors 1x 6-pin 2x 6-pin
Board number B340, B400 P278, P378

API Support & Features

DirectX 10.1 (10_1) 9.0c (9_3)
OpenGL 3.3 (full) 4.0 (partial) 2.1
OpenCL
Vulkan
Shader model 4.1 3.0

Other Features

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