AMD Radeon RX 6600 XT vs AMD Radeon HD 7990

VS

AMD Radeon RX 6600 XT AMD Radeon HD 7990

We compared two Desktop platform GPUs: 8GB VRAM Radeon RX 6600 XT and 3GB VRAM Radeon HD 7990 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon RX 6600 XT 's Advantages

Released 8 years and 3 months late

Boost Clock has increased by 159% (2589MHz vs 1000MHz)

More VRAM (8GB vs 3GB)

Lower TDP (160W vs 375W)

AMD Radeon HD 7990 's Advantages

Larger VRAM bandwidth (288.0GB/s vs 256.0GB/s)

Score

Benchmark

FP32 (float)

Radeon RX 6600 XT +158%

10.6 TFLOPS

Radeon HD 7990

4.096 TFLOPS

Radeon RX 6600 XT

VS

Radeon HD 7990

Graphics Card

Jul 2021

Release Date

Apr 2013

Navi II

Generation

Southern Islands

Desktop

Type

Desktop

PCIe 4.0 x8

Bus Interface

PCIe 3.0 x16

Clock Speeds

1968 MHz

Base Clock

950 MHz

2589 MHz

Boost Clock

1000 MHz

2000 MHz

Memory Clock

1500 MHz

Memory

8GB

Memory Size

3GB

GDDR6

Memory Type

GDDR5

128bit

Memory Bus

384bit

256.0GB/s

Bandwidth

288.0GB/s

Render Config

-

SM Count

-

32

Compute Units

32

2048

Shading Units

2048

128

TMUs

128

64

ROPs

32

-

Tensor Cores

-

32

RT Cores

-

128 KB per Array

L1 Cache

16 KB (per CU)

2 MB

L2 Cache

768 KB

Theoretical Performance

165.7 GPixel/s

Pixel Rate

32.00 GPixel/s

331.4 GTexel/s

Texture Rate

128.0 GTexel/s

21.21 TFLOPS

FP16 (half)

-

10.60 TFLOPS

FP32 (float)

4.096 TFLOPS

662.8 GFLOPS

FP64 (double)

1024 GFLOPS

Graphics Processor

Navi 23

GPU Name

Malta

Navi 23 XT (215-130000006)

GPU Variant

Malta XT (215-0849026)

RDNA 2.0

Architecture

GCN 1.0

TSMC

Foundry

TSMC

7 nm

Process Size

28 nm

11.06 billion

Transistors

4.313 billion

237 mm²

Die Size

365 mm²

Board Design

160W

TDP

375W

450 W

Suggested PSU

750 W

1x HDMI 2.1 3x DisplayPort 1.4a

Outputs

1x DVI 4x mini-DisplayPort 1.2

1x 8-pin

Power Connectors

2x 8-pin

Graphics Features

12 Ultimate (12_2)

DirectX

12 (11_1)

4.6

OpenGL

4.6

2.1

OpenCL

1.2

1.3

Vulkan

1.2

-

CUDA

-

6.7

Shader Model

5.1

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