NVIDIA GeForce GT 640 vs AMD Radeon R9 390 X2

VS

NVIDIA GeForce GT 640

AMD Radeon R9 390 X2

We compared two Desktop platform GPUs: 2GB VRAM GeForce GT 640 and 8GB VRAM Radeon R9 390 X2 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce GT 640 's Advantages

Lower TDP (65W vs 580W)

AMD Radeon R9 390 X2 's Advantages

Released 3 years and 3 months late

More VRAM (8GB vs 2GB)

Larger VRAM bandwidth (345.6GB/s vs 28.51GB/s)

2176 additional rendering cores

Score

Benchmark

FP32 (float)

GeForce GT 640

0.693 TFLOPS

Radeon R9 390 X2 +638%

5.12 TFLOPS

GeForce GT 640

VS

Radeon R9 390 X2

Graphics Card

Jun 2012

Release Date

Sep 2015

GeForce 600

Generation

Pirate Islands

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

891 MHz

Memory Clock

1350 MHz

Memory

2GB

Memory Size

8GB

DDR3

Memory Type

GDDR5

128bit

Memory Bus

512bit

28.51GB/s

Bandwidth

345.6GB/s

Render Config

-

Compute Units

40

-

384

Shading Units

2560

32

TMUs

160

16

ROPs

64

-

16 KB (per SMX)

L1 Cache

16 KB (per CU)

256 KB

L2 Cache

1024 KB

-

Theoretical Performance

7.216 GPixel/s

Pixel Rate

64.00 GPixel/s

28.86 GTexel/s

Texture Rate

160.0 GTexel/s

-

692.7 GFLOPS

FP32 (float)

5.120 TFLOPS

28.86 GFLOPS

FP64 (double)

640.0 GFLOPS

Board Design

65W

TDP

580W

250 W

Suggested PSU

950 W

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

Outputs

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

None

Power Connectors

4x 8-pin

Graphics Processor

GK107

GPU Name

Grenada

GK107-300-A2

GPU Variant

Grenada PRO (215-0880030)

Kepler

Architecture

GCN 2.0

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

1.27 billion

Transistors

6.2 billion

118 mm²

Die Size

438 mm²

Graphics Features

12 (11_0)

DirectX

12 (12_0)

4.6

OpenGL

4.6

3.0

OpenCL

2.0

1.1

Vulkan

1.2

3.0

CUDA

-

5.1

Shader Model

6.3

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