AMD Radeon HD 6990 vs AMD Radeon RX 6900 XTX

VS

AMD Radeon HD 6990 AMD Radeon RX 6900 XTX

We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 6990 and 16GB VRAM Radeon RX 6900 XTX 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 Clock2435MHz

More VRAM (16GB vs 2GB)

Larger VRAM bandwidth (576.0GB/s vs 160.0GB/s)

3584 additional rendering cores

Lower TDP (330W vs 375W)

Score

Benchmark

FP32 (float)

Radeon HD 6990

2.55 TFLOPS

Radeon RX 6900 XTX +877%

24.93 TFLOPS

Radeon HD 6990

VS

Radeon RX 6900 XTX

Graphics Card

Mar 2011

Release Date

Unknown

Northern Islands

Generation

Navi II

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 4.0 x16

Clock Speeds

-

Base Clock

2075 MHz

-

Boost Clock

2435 MHz

1250 MHz

Memory Clock

2250 MHz

Memory

2GB

Memory Size

16GB

GDDR5

Memory Type

GDDR6

256bit

Memory Bus

256bit

160.0GB/s

Bandwidth

576.0GB/s

Render Config

-

SM Count

-

24

Compute Units

80

1536

Shading Units

5120

96

TMUs

320

32

ROPs

128

-

Tensor Cores

-

RT Cores

80

8 KB (per CU)

L1 Cache

128 KB per Array

512 KB

L2 Cache

4 MB

Theoretical Performance

26.56 GPixel/s

Pixel Rate

311.7 GPixel/s

79.68 GTexel/s

Texture Rate

779.2 GTexel/s

-

FP16 (half)

49.87 TFLOPS

2.550 TFLOPS

FP32 (float)

24.93 TFLOPS

637.4 GFLOPS

FP64 (double)

1.558 TFLOPS

Graphics Processor

Antilles

GPU Name

Navi 21

Antilles XT (215-0807027)

GPU Variant

Navi 21 XTXH (215-121000247)

TeraScale 3

Architecture

RDNA 2.0

TSMC

Foundry

TSMC

40 nm

Process Size

7 nm

2.64 billion

Transistors

26.8 billion

389 mm²

Die Size

520 mm²

Board Design

375W

TDP

330W

750 W

Suggested PSU

700 W

1x DVI 4x mini-DisplayPort 1.2

Outputs

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

2x 8-pin

Power Connectors

2x 8-pin

Graphics Features

11.2 (11_0)

DirectX

12 Ultimate (12_2)

4.4

OpenGL

4.6

1.2

OpenCL

2.1

N/A

Vulkan

1.3

-

CUDA

-

5.0

Shader Model

6.5

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