AMD Radeon HD 7990 vs ATI Radeon HD 3850 X3

VS

AMD Radeon HD 7990

ATI Radeon HD 3850 X3

We compared two Desktop platform GPUs: 3GB VRAM Radeon HD 7990 and 512MB VRAM Radeon HD 3850 X3 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 7990 's Advantages

Boost Clock1000MHz

More VRAM (3GB vs 512GB)

Larger VRAM bandwidth (288.0GB/s vs 54.40GB/s)

1728 additional rendering cores

ATI Radeon HD 3850 X3 's Advantages

Lower TDP (145W vs 375W)

Score

Benchmark

FP32 (float)

Radeon HD 7990 +857%

4.096 TFLOPS

Radeon HD 3850 X3

0.428 TFLOPS

Radeon HD 7990

VS

Radeon HD 3850 X3

Graphics Card

Apr 2013

Release Date

Unknown

Southern Islands

Generation

Radeon R600

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

950 MHz

Base Clock

-

1000 MHz

Boost Clock

-

1500 MHz

Memory Clock

850 MHz

Memory

3GB

Memory Size

512MB

GDDR5

Memory Type

GDDR3

384bit

Memory Bus

256bit

288.0GB/s

Bandwidth

54.40GB/s

Render Config

32

Compute Units

4

-

2048

Shading Units

320

128

TMUs

16

32

ROPs

16

-

16 KB (per CU)

L1 Cache

-

768 KB

L2 Cache

256 KB

-

Theoretical Performance

32.00 GPixel/s

Pixel Rate

10.70 GPixel/s

128.0 GTexel/s

Texture Rate

10.70 GTexel/s

-

4.096 TFLOPS

FP32 (float)

428.2 GFLOPS

1024 GFLOPS

FP64 (double)

-

Board Design

375W

TDP

145W

750 W

Suggested PSU

300 W

1x DVI 4x mini-DisplayPort 1.2

Outputs

4x DVI

2x 8-pin

Power Connectors

1x 8-pin

Graphics Processor

Malta

GPU Name

RV670

Malta XT (215-0849026)

GPU Variant

RV670 PRO (215-0708003)

GCN 1.0

Architecture

TeraScale

TSMC

Foundry

TSMC

28 nm

Process Size

55 nm

4.313 billion

Transistors

0.666 billion

365 mm²

Die Size

192 mm²

Graphics Features

12 (11_1)

DirectX

10.1 (10_1)

4.6

OpenGL

3.3 (full) 4.0 (partial)

1.2

OpenCL

N/A

1.2

Vulkan

N/A

-

5.1

Shader Model

4.1

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