Only 1150 Mhz friend???...

Sadly yes...but not for problems with the GPU. This was my 1st experience with high end AMD/ATI GPU and I was not pretty sure the voltage limit. The driver was very...very problematic above 1200MHz/1500MHz plus I did a big mistake using an OS x64. :( . Clearly I need more experience in things like this...

You can go easy 1.26...1.28V GPU.... 1.75V RAM in the air

Use W7 64 and disable driver useless settings...

Set fan at 100% and go ahead

Well the GPU isn't more in my hands. Will ship to you soon, so, at least that I can buy one for me (something that I see extremely difficult) that is my "participation" in the MOA Americas 2012

By the way, in a quick test, the GPU hit the 1600 on RAM with 1.66V...maybe is a good indicator for you.