ATI Radeon HD 2900 XT vs AMD Radeon R9 285X

VS

ATI Radeon HD 2900 XT

AMD Radeon R9 285X

We compared two Desktop platform GPUs: 512MB VRAM Radeon HD 2900 XT and 3GB VRAM Radeon R9 285X to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon R9 285X 's Advantages

More VRAM (3GB vs 512GB)

Larger VRAM bandwidth (264.0GB/s vs 106.0GB/s)

1728 additional rendering cores

Lower TDP (200W vs 215W)

Score

Benchmark

FP32 (float)

Radeon HD 2900 XT

0.476 TFLOPS

Radeon R9 285X +762%

4.104 TFLOPS

Radeon HD 2900 XT

VS

Radeon R9 285X

Graphics Card

May 2007

Release Date

Unknown

Radeon R600

Generation

Volcanic Islands

Desktop

Type

Desktop

PCIe 1.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

828 MHz

Memory Clock

1375 MHz

Memory

512MB

Memory Size

3GB

GDDR3

Memory Type

GDDR5

512bit

Memory Bus

384bit

106.0GB/s

Bandwidth

264.0GB/s

Render Config

4

Compute Units

32

-

320

Shading Units

2048

16

TMUs

128

16

ROPs

32

-

L1 Cache

16 KB (per CU)

256 KB

L2 Cache

768 KB

-

Theoretical Performance

11.89 GPixel/s

Pixel Rate

32.06 GPixel/s

11.89 GTexel/s

Texture Rate

128.3 GTexel/s

-

475.5 GFLOPS

FP32 (float)

4.104 TFLOPS

-

Board Design

215W

TDP

200W

550 W

Suggested PSU

550 W

2x DVI 1x S-Video

Outputs

2x DVI 1x HDMI 1.4a 1x DisplayPort 1.2

1x 6-pin + 1x 8-pin

Power Connectors

1x 6-pin + 1x 8-pin

Graphics Processor

R600

GPU Name

Tonga

R600 XT (215RGMDKA13FG)

GPU Variant

Tonga XT (215-0851313)

TeraScale

Architecture

GCN 3.0

TSMC

Foundry

TSMC

80 nm

Process Size

28 nm

0.72 billion

Transistors

5 billion

420 mm²

Die Size

366 mm²

Graphics Features

10.0 (10_0)

DirectX

12 (12_0)

3.3 (full) 4.0 (partial)

OpenGL

4.6

N/A

OpenCL

2.0

N/A

Vulkan

1.2

-

4.0

Shader Model

6.3

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