Sorry to hop in here DM.....
alpha1 .........The Intel port you are using is the ICH10R.....Sadly it's only SATAII.....not SATAIII.......
With the speeds you quoted, it seems you have an underlying problem as you should be getting better speeds even off the Intel port, ....your writes seem OK-ish but your read speeds are rather low..........which will probably follow you through when you connect it up to the correct port for this SSD.
The Marvell port is SATAIII and is the better port for the SSD you have, as the Marvell problems of past have apparently been rectified on the Z68 platform if configured correctly with the right drivers.......pick a benchmark you like and stick with it, different software will always give different results.......it's confusing enough without trying to figure out why there so far apart
I use ATTO as it's robust, consistent and used widely by OCZ users and staff.......it's apparently a little kinder to SSDs then some but still should be used sparingly.........SSD efficiency goes south with constant benching no matter which one you use..........hope this helps!
Aussie Allan