AMD Radeon RX 6900 XT vs NVIDIA GeForce GT 645 OEM

VS

AMD Radeon RX 6900 XT

NVIDIA GeForce GT 645 OEM

We compared two Desktop platform GPUs: 16GB VRAM Radeon RX 6900 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

AMD Radeon RX 6900 XT 's Advantages

Released 8 years and 6 months late

Boost Clock2250MHz

More VRAM (16GB vs 1024GB)

Larger VRAM bandwidth (512.0GB/s vs 91.87GB/s)

4832 additional rendering cores

NVIDIA GeForce GT 645 OEM 's Advantages

Lower TDP (102W vs 300W)

Score

Benchmark

FP32 (float)

Radeon RX 6900 XT +2477%

23.04 TFLOPS

GeForce GT 645 OEM

0.894 TFLOPS

Radeon RX 6900 XT

VS

GeForce GT 645 OEM

Graphics Card

Oct 2020

Release Date

Apr 2012

Navi II

Generation

GeForce 600

Desktop

Type

Desktop

PCIe 4.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

1825 MHz

Base Clock

-

2250 MHz

Boost Clock

-

2000 MHz

Memory Clock

957 MHz

Memory

16GB

Memory Size

1024MB

GDDR6

Memory Type

GDDR5

256bit

Memory Bus

192bit

512.0GB/s

Bandwidth

91.87GB/s

Render Config

80

Compute Units

-

SM Count

6

5120

Shading Units

288

320

TMUs

48

128

ROPs

24

-

80

RT Cores

-

128 KB per Array

L1 Cache

64 KB (per SM)

4 MB

L2 Cache

384 KB

128 MB

L3 Cache

-

Theoretical Performance

288.0 GPixel/s

Pixel Rate

9.312 GPixel/s

720.0 GTexel/s

Texture Rate

37.25 GTexel/s

46.08 TFLOPS

FP16 (half)

-

23.04 TFLOPS

FP32 (float)

894.0 GFLOPS

1440 GFLOPS

FP64 (double)

74.50 GFLOPS

Board Design

300W

TDP

102W

700 W

Suggested PSU

300 W

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

Outputs

2x DVI 1x mini-HDMI 1.3a

2x 8-pin

Power Connectors

-

Graphics Processor

Navi 21

GPU Name

GF114

Navi 21 XTX (215-121000167)

GPU Variant

-

RDNA 2.0

Architecture

Fermi 2.0

TSMC

Foundry

TSMC

7 nm

Process Size

40 nm

26.8 billion

Transistors

1.95 billion

520 mm²

Die Size

332 mm²

Graphics Features

12 Ultimate (12_2)

DirectX

12 (11_0)

4.6

OpenGL

4.6

2.1

OpenCL

1.1

1.3

Vulkan

N/A

-

CUDA

2.1

6.5

Shader Model

5.1

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