AMD Radeon HD 7970 X2 vs NVIDIA GeForce GTX 645 OEM

VS

AMD Radeon HD 7970 X2

NVIDIA GeForce GTX 645 OEM

We compared two Desktop platform GPUs: 3GB VRAM Radeon HD 7970 X2 and 1024MB VRAM GeForce GTX 645 OEM to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 7970 X2 's Advantages

More VRAM (3GB vs 1024GB)

Larger VRAM bandwidth (264.0GB/s vs 64.00GB/s)

1472 additional rendering cores

NVIDIA GeForce GTX 645 OEM 's Advantages

Released 8 months late

Lower TDP (65W vs 500W)

Score

Benchmark

FP32 (float)

Radeon HD 7970 X2 +299%

3.789 TFLOPS

GeForce GTX 645 OEM

0.949 TFLOPS

Radeon HD 7970 X2

VS

GeForce GTX 645 OEM

Graphics Card

Aug 2012

Release Date

Apr 2013

Southern Islands

Generation

GeForce 600

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

1375 MHz

Memory Clock

1000 MHz

Memory

3GB

Memory Size

1024MB

GDDR5

Memory Type

GDDR5

384bit

Memory Bus

128bit

264.0GB/s

Bandwidth

64.00GB/s

Render Config

32

Compute Units

-

2048

Shading Units

576

128

TMUs

48

32

ROPs

16

-

16 KB (per CU)

L1 Cache

16 KB (per SMX)

768 KB

L2 Cache

256 KB

-

Theoretical Performance

29.60 GPixel/s

Pixel Rate

9.888 GPixel/s

118.4 GTexel/s

Texture Rate

39.55 GTexel/s

-

3.789 TFLOPS

FP32 (float)

949.2 GFLOPS

947.2 GFLOPS

FP64 (double)

39.55 GFLOPS

Board Design

500W

TDP

65W

900 W

Suggested PSU

250 W

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

Outputs

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

3x 8-pin

Power Connectors

None

Graphics Processor

New Zealand

GPU Name

GK106

-

GPU Variant

GK106-200-A1

GCN 1.0

Architecture

Kepler

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

4.313 billion

Transistors

2.54 billion

352 mm²

Die Size

221 mm²

Graphics Features

12 (11_1)

DirectX

12 (11_0)

4.6

OpenGL

4.6

1.2

OpenCL

3.0

1.2

Vulkan

1.1

-

CUDA

3.0

5.1

Shader Model

5.1

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