ATI Radeon HD 2900 XT vs NVIDIA GeForce GTX 660

VS

ATI Radeon HD 2900 XT NVIDIA GeForce GTX 660

We compared two Desktop platform GPUs: 512MB VRAM Radeon HD 2900 XT and 2GB VRAM GeForce GTX 660 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce GTX 660 's Advantages

Released 5 years and 4 months late

Boost Clock1032MHz

Larger VRAM bandwidth (144.2GB/s vs 106.0GB/s)

640 additional rendering cores

Lower TDP (140W vs 215W)

Score

Benchmark

FP32 (float)

Radeon HD 2900 XT

0.476 TFLOPS

GeForce GTX 660 +316%

1.981 TFLOPS

Radeon HD 2900 XT

VS

GeForce GTX 660

Graphics Card

May 2007

Release Date

Sep 2012

Radeon R600

Generation

GeForce 600

Desktop

Type

Desktop

PCIe 1.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

Base Clock

980 MHz

-

Boost Clock

1032 MHz

828 MHz

Memory Clock

1502 MHz

Memory

512MB

Memory Size

2GB

GDDR3

Memory Type

GDDR5

512bit

Memory Bus

192bit

106.0GB/s

Bandwidth

144.2GB/s

Render Config

-

SM Count

-

4

Compute Units

-

320

Shading Units

960

16

TMUs

80

16

ROPs

24

-

Tensor Cores

-

RT Cores

-

L1 Cache

16 KB (per SMX)

256 KB

L2 Cache

384 KB

Theoretical Performance

11.89 GPixel/s

Pixel Rate

20.64 GPixel/s

11.89 GTexel/s

Texture Rate

82.56 GTexel/s

-

FP16 (half)

-

475.5 GFLOPS

FP32 (float)

1.981 TFLOPS

-

FP64 (double)

82.56 GFLOPS

Graphics Processor

R600

GPU Name

GK106

R600 XT (215RGMDKA13FG)

GPU Variant

GK106-400-A1

TeraScale

Architecture

Kepler

TSMC

Foundry

TSMC

80 nm

Process Size

28 nm

0.72 billion

Transistors

2.54 billion

420 mm²

Die Size

221 mm²

Board Design

215W

TDP

140W

550 W

Suggested PSU

300 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

Graphics Features

10.0 (10_0)

DirectX

12 (11_0)

3.3 (full) 4.0 (partial)

OpenGL

4.6

N/A

OpenCL

3.0

N/A

Vulkan

1.1

-

CUDA

3.0

4.0

Shader Model

5.1

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