In my case is more significant the power of a single CPU core than the total number of CPU. (In my current dedicated server I have disabled the hipertheading)
I'm testing you're server in order to transfer a performance critical application I have in a dedicated server. My current bottle neck is on disk io so I thought that your ssd based service will solve my performance issues but:
Although the SSD increases the respond time of the first run of a query, all subsequent queries are CPU bounded and are significant slower than my current non-SSD dedicated server.