AMD Phenom II X6 1075T
AMD Phenom II X6 1075T 3.00GHz Processor
Asus Crosshair IV Formula Motherboard
Corsair Dominator GT 4GB 2000mhz
ATi Radeon HD 5870 1GB GDDR5 Graphics Card
Corsair AX1200w PSU
Windows 7 Home Premium x64
Today, many of AMD's mid range processors wear the Black Edition badge, but sadly the 1075T does not. However, with its higher (than 1055T) multiplier, is a fully unlocked multiplier range necessary?
In our case, not really. Armed with our trusty Crosshair IV we steadily worked our way upwards with a variety of different CPU Multi and Base HTT combinations.
On the way we were able to obtain very respectable memory frequencies with the 1075T's IMC. Our sample pushed our RAM to 1920MHz, which is quite impressive for Phenom II. While we were at it, we also tried to push base HTT and IMC frequencies for all they were worth, reaching a maximum of 3100MHz.
While high overall HTT frequencies aren't all that important, I would very much like to stress how imperative it is to ramp up NB (IMC) frequencies as you overclock your Phenom II processor. It has a significant impact on memory bandwidth and often translates to performance differences in real life applications.
I know I'm beginning to digress so I'll get to the point. Having played with Max HTT/NB/Memory, we then went on to determine the maximum processor frequency of 4200MHz (300 x 14). Sadly this wasn't quite as stable as we hoped, but after some further refinement we found ourselves at an impressive (and honest) 4.075GHz overclock; just over 1GHz over its default frequency.
As you can see, this was achieved without pushing over the (warm) 1.50V mark. If you are the sort of person that thinks that stability tests such as OCCT, LinX, Prime95 are excessive, then perhaps our maximum frequency could be achieved with a lower voltage, but we would rather do things the proper way.
If we could assert that all 1075T's could overclock in the region of 4.10GHz (like this one), then in our eyes there is little reason to invest extra funds towards the range topping 1090T.
With a stable overclock determined, it is now time to get testing.