You could download the ATTO disk benchmark tool.

For most SSD drives, the big thing is the read speed.
The write speed might not be anything spectacular; at the time I bought my SSD, the top SSD's were the Intel X25-M's, which actually performed worse than many platter drives at write speeds, but blew everything away with their read speed.

Also not sure the size of the average warcraft file; you will get faster or slower results with larger or smaller files.