ATI Radeon HD 2900 XT vs AMD Radeon HD 6990

VS

ATI Radeon HD 2900 XT

AMD Radeon HD 6990

We compared two Desktop platform GPUs: 512MB VRAM Radeon HD 2900 XT and 2GB VRAM Radeon HD 6990 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

ATI Radeon HD 2900 XT 's Advantages

Lower TDP (215W vs 375W)

AMD Radeon HD 6990 's Advantages

Released 3 years and 10 months late

More VRAM (2GB vs 512GB)

Larger VRAM bandwidth (160.0GB/s vs 106.0GB/s)

1216 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon HD 2900 XT

0.476 TFLOPS

Radeon HD 6990 +435%

2.55 TFLOPS

Radeon HD 2900 XT

VS

Radeon HD 6990

Graphics Card

May 2007

Release Date

Mar 2011

Radeon R600

Generation

Northern Islands

Desktop

Type

Desktop

PCIe 1.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

828 MHz

Memory Clock

1250 MHz

Memory

512MB

Memory Size

2GB

GDDR3

Memory Type

GDDR5

512bit

Memory Bus

256bit

106.0GB/s

Bandwidth

160.0GB/s

Render Config

4

Compute Units

24

-

320

Shading Units

1536

16

TMUs

96

16

ROPs

32

-

L1 Cache

8 KB (per CU)

256 KB

L2 Cache

512 KB

-

Theoretical Performance

11.89 GPixel/s

Pixel Rate

26.56 GPixel/s

11.89 GTexel/s

Texture Rate

79.68 GTexel/s

-

475.5 GFLOPS

FP32 (float)

2.550 TFLOPS

-

FP64 (double)

637.4 GFLOPS

Board Design

215W

TDP

375W

550 W

Suggested PSU

750 W

2x DVI 1x S-Video

Outputs

1x DVI 4x mini-DisplayPort 1.2

1x 6-pin + 1x 8-pin

Power Connectors

2x 8-pin

Graphics Processor

R600

GPU Name

Antilles

R600 XT (215RGMDKA13FG)

GPU Variant

Antilles XT (215-0807027)

TeraScale

Architecture

TeraScale 3

TSMC

Foundry

TSMC

80 nm

Process Size

40 nm

0.72 billion

Transistors

2.64 billion

420 mm²

Die Size

389 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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