AMD Radeon RX 6900 XTX vs NVIDIA GeForce GTX 660

VS

AMD Radeon RX 6900 XTX

NVIDIA GeForce GTX 660

We compared two Desktop platform GPUs: 16GB VRAM Radeon RX 6900 XTX and 2GB VRAM GeForce GTX 660 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon RX 6900 XTX 's Advantages

Boost Clock has increased by 136% (2435MHz vs 1032MHz)

More VRAM (16GB vs 2GB)

Larger VRAM bandwidth (576.0GB/s vs 144.2GB/s)

4160 additional rendering cores

NVIDIA GeForce GTX 660 's Advantages

Lower TDP (140W vs 330W)

Score

Benchmark

FP32 (float)

Radeon RX 6900 XTX +1158%

24.93 TFLOPS

GeForce GTX 660

1.981 TFLOPS

Radeon RX 6900 XTX

VS

GeForce GTX 660

Graphics Card

Unknown

Release Date

Sep 2012

Navi II

Generation

GeForce 600

Desktop

Type

Desktop

PCIe 4.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

2075 MHz

Base Clock

980 MHz

2435 MHz

Boost Clock

1032 MHz

2250 MHz

Memory Clock

1502 MHz

Memory

16GB

Memory Size

2GB

GDDR6

Memory Type

GDDR5

256bit

Memory Bus

192bit

576.0GB/s

Bandwidth

144.2GB/s

Render Config

80

Compute Units

-

5120

Shading Units

960

320

TMUs

80

128

ROPs

24

-

80

RT Cores

-

128 KB per Array

L1 Cache

16 KB (per SMX)

4 MB

L2 Cache

384 KB

128 MB

L3 Cache

-

Theoretical Performance

311.7 GPixel/s

Pixel Rate

20.64 GPixel/s

779.2 GTexel/s

Texture Rate

82.56 GTexel/s

49.87 TFLOPS

FP16 (half)

-

24.93 TFLOPS

FP32 (float)

1.981 TFLOPS

1.558 TFLOPS

FP64 (double)

82.56 GFLOPS

Board Design

330W

TDP

140W

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 Processor

Navi 21

GPU Name

GK106

Navi 21 XTXH (215-121000247)

GPU Variant

GK106-400-A1

RDNA 2.0

Architecture

Kepler

TSMC

Foundry

TSMC

7 nm

Process Size

28 nm

26.8 billion

Transistors

2.54 billion

520 mm²

Die Size

221 mm²

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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