AMD Radeon HD 6990 vs AMD Radeon R9 390 X2

VS

AMD Radeon HD 6990

AMD Radeon R9 390 X2

We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 6990 and 8GB VRAM Radeon R9 390 X2 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 6990 's Advantages

Lower TDP (375W vs 580W)

AMD Radeon R9 390 X2 's Advantages

Released 4 years and 6 months late

More VRAM (8GB vs 2GB)

Larger VRAM bandwidth (345.6GB/s vs 160.0GB/s)

1024 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon HD 6990

2.55 TFLOPS

Radeon R9 390 X2 +100%

5.12 TFLOPS

Radeon HD 6990

VS

Radeon R9 390 X2

Graphics Card

Mar 2011

Release Date

Sep 2015

Northern Islands

Generation

Pirate Islands

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

1250 MHz

Memory Clock

1350 MHz

Memory

2GB

Memory Size

8GB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

512bit

160.0GB/s

Bandwidth

345.6GB/s

Render Config

24

Compute Units

40

-

1536

Shading Units

2560

96

TMUs

160

32

ROPs

64

-

8 KB (per CU)

L1 Cache

16 KB (per CU)

512 KB

L2 Cache

1024 KB

-

Theoretical Performance

26.56 GPixel/s

Pixel Rate

64.00 GPixel/s

79.68 GTexel/s

Texture Rate

160.0 GTexel/s

-

2.550 TFLOPS

FP32 (float)

5.120 TFLOPS

637.4 GFLOPS

FP64 (double)

640.0 GFLOPS

Board Design

375W

TDP

580W

750 W

Suggested PSU

950 W

1x DVI 4x mini-DisplayPort 1.2

Outputs

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

2x 8-pin

Power Connectors

4x 8-pin

Graphics Processor

Antilles

GPU Name

Grenada

Antilles XT (215-0807027)

GPU Variant

Grenada PRO (215-0880030)

TeraScale 3

Architecture

GCN 2.0

TSMC

Foundry

TSMC

40 nm

Process Size

28 nm

2.64 billion

Transistors

6.2 billion

389 mm²

Die Size

438 mm²

Graphics Features

11.2 (11_0)

DirectX

12 (12_0)

4.4

OpenGL

4.6

1.2

OpenCL

2.0

N/A

Vulkan

1.2

-

5.0

Shader Model

6.3

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