AMD Radeon RX 6900 XT vs NVIDIA GeForce GTX 660 OEM

VS

AMD Radeon RX 6900 XT NVIDIA GeForce GTX 660 OEM

We compared two Desktop platform GPUs: 16GB VRAM Radeon RX 6900 XT and 1536MB VRAM GeForce GTX 660 OEM to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon RX 6900 XT 's Advantages

Released 8 years and 2 months late

Boost Clock has increased by 153% (2250MHz vs 888MHz)

More VRAM (16GB vs 1GB)

Larger VRAM bandwidth (512.0GB/s vs 134.4GB/s)

3968 additional rendering cores

NVIDIA GeForce GTX 660 OEM 's Advantages

Lower TDP (130W vs 300W)

Score

Benchmark

FP32 (float)

Radeon RX 6900 XT +1026%

23.04 TFLOPS

GeForce GTX 660 OEM

2.046 TFLOPS

Radeon RX 6900 XT

VS

GeForce GTX 660 OEM

Graphics Card

Oct 2020

Release Date

Aug 2012

Navi II

Generation

GeForce 600

Desktop

Type

Desktop

PCIe 4.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

1825 MHz

Base Clock

823 MHz

2250 MHz

Boost Clock

888 MHz

2000 MHz

Memory Clock

1400 MHz

Memory

16GB

Memory Size

1536MB

GDDR6

Memory Type

GDDR5

256bit

Memory Bus

192bit

512.0GB/s

Bandwidth

134.4GB/s

Render Config

-

SM Count

-

80

Compute Units

-

5120

Shading Units

1152

320

TMUs

96

128

ROPs

24

-

Tensor Cores

-

80

RT Cores

-

128 KB per Array

L1 Cache

16 KB (per SMX)

4 MB

L2 Cache

384 KB

Theoretical Performance

288.0 GPixel/s

Pixel Rate

21.31 GPixel/s

720.0 GTexel/s

Texture Rate

85.25 GTexel/s

46.08 TFLOPS

FP16 (half)

-

23.04 TFLOPS

FP32 (float)

2.046 TFLOPS

1440 GFLOPS

FP64 (double)

85.25 GFLOPS

Graphics Processor

Navi 21

GPU Name

GK104

Navi 21 XTX (215-121000167)

GPU Variant

GK104-200-KD-A2

RDNA 2.0

Architecture

Kepler

TSMC

Foundry

TSMC

7 nm

Process Size

28 nm

26.8 billion

Transistors

3.54 billion

520 mm²

Die Size

294 mm²

Board Design

300W

TDP

130W

700 W

Suggested PSU

300 W

1x HDMI 2.1 2x DisplayPort 1.4a 1x USB Type-C

Outputs

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

2x 8-pin

Power Connectors

1x 6-pin

Graphics Features

12 Ultimate (12_2)

DirectX

12 (11_0)

4.6

OpenGL

4.6

2.1

OpenCL

3.0

1.3

Vulkan

1.1

-

CUDA

3.0

6.5

Shader Model

5.1

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