ATI Radeon HD 2900 XT vs AMD Radeon HD 6850

VS

ATI Radeon HD 2900 XT

AMD Radeon HD 6850

We compared two Desktop platform GPUs: 512MB VRAM Radeon HD 2900 XT and 1024MB VRAM Radeon HD 6850 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 6850 's Advantages

Released 3 years and 5 months late

More VRAM (1024GB vs 512GB)

Larger VRAM bandwidth (128.0GB/s vs 106.0GB/s)

640 additional rendering cores

Lower TDP (127W vs 215W)

Score

Benchmark

FP32 (float)

Radeon HD 2900 XT

0.476 TFLOPS

Radeon HD 6850 +212%

1.488 TFLOPS

Radeon HD 2900 XT

VS

Radeon HD 6850

Graphics Card

May 2007

Release Date

Oct 2010

Radeon R600

Generation

Northern Islands

Desktop

Type

Desktop

PCIe 1.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

828 MHz

Memory Clock

1000 MHz

Memory

512MB

Memory Size

1024MB

GDDR3

Memory Type

GDDR5

512bit

Memory Bus

256bit

106.0GB/s

Bandwidth

128.0GB/s

Render Config

4

Compute Units

12

-

320

Shading Units

960

16

TMUs

48

16

ROPs

32

-

L1 Cache

8 KB (per CU)

256 KB

L2 Cache

512 KB

-

Theoretical Performance

11.89 GPixel/s

Pixel Rate

24.80 GPixel/s

11.89 GTexel/s

Texture Rate

37.20 GTexel/s

-

475.5 GFLOPS

FP32 (float)

1488 GFLOPS

-

Board Design

215W

TDP

127W

550 W

Suggested PSU

300 W

2x DVI 1x S-Video

Outputs

2x DVI 1x HDMI 1.3a 2x mini-DisplayPort 1.1

1x 6-pin + 1x 8-pin

Power Connectors

1x 6-pin

Graphics Processor

R600

GPU Name

Barts

R600 XT (215RGMDKA13FG)

GPU Variant

Barts PRO (215-0798006)

TeraScale

Architecture

TeraScale 2

TSMC

Foundry

TSMC

80 nm

Process Size

40 nm

0.72 billion

Transistors

1.7 billion

420 mm²

Die Size

255 mm²

Graphics Features

10.0 (10_0)

DirectX

11.2 (11_0)

3.3 (full) 4.0 (partial)

OpenGL

4.4

N/A

OpenCL

1.2

N/A

Vulkan

N/A

-

4.0

Shader Model

5.0

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