ATI Radeon HD 2900 GT vs ATI Radeon HD 3870 X2

VS

ATI Radeon HD 2900 GT ATI Radeon HD 3870 X2

We compared two Desktop platform GPUs: 256MB VRAM Radeon HD 2900 GT and 512MB VRAM Radeon HD 3870 X2 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

ATI Radeon HD 2900 GT 's Advantages

Lower TDP (150W vs 165W)

ATI Radeon HD 3870 X2 's Advantages

More VRAM (512GB vs 256GB)

Larger VRAM bandwidth (57.66GB/s vs 51.20GB/s)

80 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon HD 2900 GT

0.288 TFLOPS

Radeon HD 3870 X2 +83%

0.528 TFLOPS

Radeon HD 2900 GT

VS

Radeon HD 3870 X2

Graphics Card

Nov 2007

Release Date

Jan 2008

Radeon R600

Generation

Radeon R600

Desktop

Type

Desktop

PCIe 1.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

Base Clock

-

Boost Clock

-

800 MHz

Memory Clock

901 MHz

Memory

256MB

Memory Size

512MB

GDDR3

Memory Type

GDDR3

256bit

Memory Bus

256bit

51.20GB/s

Bandwidth

57.66GB/s

Render Config

-

SM Count

-

3

Compute Units

4

240

Shading Units

320

12

TMUs

16

12

ROPs

16

-

Tensor Cores

-

RT Cores

-

L1 Cache

-

128 KB

L2 Cache

256 KB

Theoretical Performance

7.212 GPixel/s

Pixel Rate

13.20 GPixel/s

7.212 GTexel/s

Texture Rate

13.20 GTexel/s

-

FP16 (half)

-

288.5 GFLOPS

FP32 (float)

528.0 GFLOPS

-

FP64 (double)

105.6 GFLOPS

Graphics Processor

R600

GPU Name

R680

R600 GT (215RGFDKA13FG)

GPU Variant

R680 XT (215-0708017)

TeraScale

Architecture

TeraScale

TSMC

Foundry

TSMC

80 nm

Process Size

55 nm

0.72 billion

Transistors

0.666 billion

420 mm²

Die Size

192 mm²

Board Design

150W

TDP

165W

450 W

Suggested PSU

450 W

2x DVI 1x S-Video

Outputs

2x DVI 1x S-Video

1x 8-pin

Power Connectors

1x 6-pin + 1x 8-pin

Graphics Features

10.0 (10_0)

DirectX

10.1 (10_1)

3.3 (full) 4.0 (partial)

OpenGL

3.3 (full) 4.0 (partial)

N/A

OpenCL

N/A

Vulkan

N/A

-

CUDA

-

4.0

Shader Model

4.1

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