一个m1的Sql Server企业版许可成本是多少?大在AWS实例吗?

The combination of Sql Server pricing and Amazon Web Services Core Specifications confuses the hell out of me. Sql Server is currently licensed per core and I have found 2 core packs priced for around k. A single large instance on AWS provides 4 Elastic Compute Units, which depending on what documentation you read equates to 2 virtual cores (2x ECU = 1x Core), 4 virtual cores (1x ECU = 1x Core) or 8 virtual cores (1x ECU = 2x Core). By opening performance monitor on my existing Sql Server box, it appears that the first option (2 virtual cores) is correct, however, I have read documentation that leads me to believe the last option (8 virtual cores) is also possible and may be the way Microsoft calculates their licensing policy.The combination of Sql Server pricing and Amazo