ATI Radeon HD 2900 XT vs NVIDIA GeForce GT 645 OEM

VS

ATI Radeon HD 2900 XT

NVIDIA GeForce GT 645 OEM

We compared two Desktop platform GPUs: 512MB VRAM Radeon HD 2900 XT and 1024MB VRAM GeForce GT 645 OEM to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

ATI Radeon HD 2900 XT 's Advantages

Larger VRAM bandwidth (106.0GB/s vs 91.87GB/s)

32 additional rendering cores

NVIDIA GeForce GT 645 OEM 's Advantages

Released 4 years and 11 months late

More VRAM (1024GB vs 512GB)

Lower TDP (102W vs 215W)

Score

Benchmark

FP32 (float)

Radeon HD 2900 XT

0.476 TFLOPS

GeForce GT 645 OEM +87%

0.894 TFLOPS

Radeon HD 2900 XT

VS

GeForce GT 645 OEM

Graphics Card

May 2007

Release Date

Apr 2012

Radeon R600

Generation

GeForce 600

Desktop

Type

Desktop

PCIe 1.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

828 MHz

Memory Clock

957 MHz

Memory

512MB

Memory Size

1024MB

GDDR3

Memory Type

GDDR5

512bit

Memory Bus

192bit

106.0GB/s

Bandwidth

91.87GB/s

Render Config

4

Compute Units

-

SM Count

6

320

Shading Units

288

16

TMUs

48

16

ROPs

24

-

L1 Cache

64 KB (per SM)

256 KB

L2 Cache

384 KB

-

Theoretical Performance

11.89 GPixel/s

Pixel Rate

9.312 GPixel/s

11.89 GTexel/s

Texture Rate

37.25 GTexel/s

-

475.5 GFLOPS

FP32 (float)

894.0 GFLOPS

-

FP64 (double)

74.50 GFLOPS

Board Design

215W

TDP

102W

550 W

Suggested PSU

300 W

2x DVI 1x S-Video

Outputs

2x DVI 1x mini-HDMI 1.3a

1x 6-pin + 1x 8-pin

Power Connectors

-

Graphics Processor

R600

GPU Name

GF114

R600 XT (215RGMDKA13FG)

GPU Variant

-

TeraScale

Architecture

Fermi 2.0

TSMC

Foundry

TSMC

80 nm

Process Size

40 nm

0.72 billion

Transistors

1.95 billion

420 mm²

Die Size

332 mm²

Graphics Features

10.0 (10_0)

DirectX

12 (11_0)

3.3 (full) 4.0 (partial)

OpenGL

4.6

N/A

OpenCL

1.1

N/A

Vulkan

N/A

-

CUDA

2.1

4.0

Shader Model

5.1

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