AMD Radeon HD 7990 vs NVIDIA GeForce 8400

VS

AMD Radeon HD 7990

NVIDIA GeForce 8400

We compared two Desktop platform GPUs: 3GB VRAM Radeon HD 7990 and 256MB VRAM GeForce 8400 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 7990 's Advantages

Released 5 years and 4 months late

Boost Clock1000MHz

More VRAM (3GB vs 256GB)

Larger VRAM bandwidth (288.0GB/s vs 8.000GB/s)

2040 additional rendering cores

NVIDIA GeForce 8400 's Advantages

Lower TDP (25W vs 375W)

Score

Benchmark

FP32 (float)

Radeon HD 7990 +19404%

4.096 TFLOPS

GeForce 8400

0.021 TFLOPS

Radeon HD 7990

VS

GeForce 8400

Graphics Card

Apr 2013

Release Date

Dec 2007

Southern Islands

Generation

GeForce 8

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

500 MHz

Memory

3GB

Memory Size

256MB

GDDR5

Memory Type

DDR2

384bit

Memory Bus

64bit

288.0GB/s

Bandwidth

8.000GB/s

Render Config

32

Compute Units

-

SM Count

1

2048

Shading Units

8

128

TMUs

4

32

ROPs

4

-

16 KB (per CU)

L1 Cache

-

768 KB

L2 Cache

16 KB

-

Theoretical Performance

32.00 GPixel/s

Pixel Rate

2.160 GPixel/s

128.0 GTexel/s

Texture Rate

2.160 GTexel/s

-

4.096 TFLOPS

FP32 (float)

20.80 GFLOPS

1024 GFLOPS

FP64 (double)

-

Board Design

375W

TDP

25W

750 W

Suggested PSU

200 W

1x DVI 4x mini-DisplayPort 1.2

Outputs

1x DVI 1x VGA 1x S-Video

2x 8-pin

Power Connectors

None

Graphics Processor

Malta

GPU Name

G98

Malta XT (215-0849026)

GPU Variant

-

GCN 1.0

Architecture

Tesla

TSMC

Foundry

TSMC

28 nm

Process Size

65 nm

4.313 billion

Transistors

0.21 billion

365 mm²

Die Size

86 mm²

Graphics Features

12 (11_1)

DirectX

11.1 (10_0)

4.6

OpenGL

3.3

1.2

OpenCL

1.1

1.2

Vulkan

N/A

-

CUDA

1.1

5.1

Shader Model

4.0

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