AMD Radeon HD 6990 vs NVIDIA GeForce GTX 645 OEM

VS

AMD Radeon HD 6990

NVIDIA GeForce GTX 645 OEM

We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 6990 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 6990 's Advantages

More VRAM (2GB vs 1024GB)

Larger VRAM bandwidth (160.0GB/s vs 64.00GB/s)

960 additional rendering cores

NVIDIA GeForce GTX 645 OEM 's Advantages

Released 2 years and 1 months late

Lower TDP (65W vs 375W)

Score

Benchmark

FP32 (float)

Radeon HD 6990 +168%

2.55 TFLOPS

GeForce GTX 645 OEM

0.949 TFLOPS

Radeon HD 6990

VS

GeForce GTX 645 OEM

Graphics Card

Mar 2011

Release Date

Apr 2013

Northern Islands

Generation

GeForce 600

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

1250 MHz

Memory Clock

1000 MHz

Memory

2GB

Memory Size

1024MB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

128bit

160.0GB/s

Bandwidth

64.00GB/s

Render Config

24

Compute Units

-

1536

Shading Units

576

96

TMUs

48

32

ROPs

16

-

8 KB (per CU)

L1 Cache

16 KB (per SMX)

512 KB

L2 Cache

256 KB

-

Theoretical Performance

26.56 GPixel/s

Pixel Rate

9.888 GPixel/s

79.68 GTexel/s

Texture Rate

39.55 GTexel/s

-

2.550 TFLOPS

FP32 (float)

949.2 GFLOPS

637.4 GFLOPS

FP64 (double)

39.55 GFLOPS

Board Design

375W

TDP

65W

750 W

Suggested PSU

250 W

1x DVI 4x mini-DisplayPort 1.2

Outputs

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

2x 8-pin

Power Connectors

None

Graphics Processor

Antilles

GPU Name

GK106

Antilles XT (215-0807027)

GPU Variant

GK106-200-A1

TeraScale 3

Architecture

Kepler

TSMC

Foundry

TSMC

40 nm

Process Size

28 nm

2.64 billion

Transistors

2.54 billion

389 mm²

Die Size

221 mm²

Graphics Features

11.2 (11_0)

DirectX

12 (11_0)

4.4

OpenGL

4.6

1.2

OpenCL

3.0

N/A

Vulkan

1.1

-

CUDA

3.0

5.0

Shader Model

5.1

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