It varies between MP & SP but the sequential read speed is the main factor. I got the results below from HAB v0.7a. http://testmem.tz.ru/soft.htm#HAB
Click the > and it will show you statistics.
If I look at a trace of reads/ writes playing MW2 SP for 21 minutes I get this:
Read < 1MB/s – 271MB – Over 19.15s
Read > 1MB/s – 2.2GB – Over 1.40s
Write < 1MB/s – 9.6MB – Over 19.58s
Write > 1MB/s –10MB – Over 4s
If I look at a trace of reads/ writes playing MW2 MP for 31 minutes I get this:
Read < 1MB/s – 244MB – Over 29.48s
Read > 1MB/s – 1.2GB – Over 1.20s
Write < 1MB/s – 26MB – Over 30.43s
Write > 1MB/s –4.2MB – Over 2s
The quoted OCZ Vertex 2 speeds are best case scenarios with compressible data. If the data is not compressible the read and write speeds will drop considerably, so I don’t think you would see any real life performance difference.
When HDD fragments it increases the already horrifically slow access time to find the data. Access time on SSD is so fast that it makes little difference.
The game load times are quicker. Why don't you wait until the new Intel SSD drives are released. If I was you I'd not want two different types of SSD in my computer. It would be a whole lot easier to manage with Intel Toolbox and Rapid Storage Technology programs giving good support and maintenance. I doubt OCZ have as good support as Intel offer.