「AWS EC2」 Server Overview

「PRICING」

On-Demand instances, you pay for compute capacity by per hour or per second depending on which instances you run.
Spot instances are available at a discount of up to 90% off compared to On-Demand pricing.
Reserved Instances provide you with a significant discount (up to 75%) compared to On-Demand instance pricing.

「SPOT INSTANCE」

Refer to: Amazon EC2 Spot Instances Pricing

The Spot instance is the spare resources of AWS computers, that being said, its existence uncertain, it all depends on the market.

The price for a Spot instance is always changing. And the way to use it is to set a maximum hourly price for each instance. When the price hit the limitation you've set, the instance will be automatically TERMINATED!

Hence, it's not good for long term running, but rather for short term computation needs.

For Asia Pacific (Singapore):

• General purposes:

• Compute Optimized:
• GPU Instances:

• Memory Optimized:
• Storage Optimized:
• Micro Instances:

• Cluster GPU Instances are not available in all regions.

「ON-DEMAND」 Instance (Standard)

Refer to: Amazon EC2 Pricing

For Asia Pacific (Singapore):

• General purposes:

• Compute Optimized:

• GPU Instances:

• Memory Optimized:

• Storage Optimized:

Data transfer:

• All data Transfer IN: FREE
• Data Transfer OUT:

「RESERVED」 Instance (Yearly contract)

Refer to: Amazon EC2 Reserved Instances Pricing

「DETICATED HOST」Instance

Refer to: Amazon EC2 Dedicated Hosts Pricing

「EBS」Elastic Block Storage (including AMI)

Refer to: Amazon EBS Pricing
Refer to Stackoverflow: Cost of storing AMI