|AMD Phenom-II X6-1075T CPU HDT75TFBGRBOX|
|Reviews - Featured Reviews: Processors|
|Written by David Ramsey|
|Tuesday, 21 September 2010|
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Phenom II X6 1075T Overclocking
Unlike the 1090T Black Edition and 965 Black Edition, the 1075T has a locked multiplier, and thus the only way to overclock it is to raise what ASUS calls the "CPU Bus Frequency". I know from my previous review of the ASUS Crosshair IV Formula motherboard that this motherboard is capable of supporting very high overclocks, so I started raising the bus frequency from its standard 200MHz pretty aggressively. I settled on 277MHz, which resulted in a stable 4.155GHz, although I did have to tweak the CPU voltage to 1.46V to make it through all the tests in this review. I always disable auto-overclocking features like Turbo Core when I overclock, since I'm trying to reach the highest frequency all cores can sustain and don't want a system suddenly crashing when the CPU tries to crank things up a few hundred MHz. For cooling, I used a CoolIT Systems ECO A.L.C. Eco-R120 CPU cooler.
AMD may have shot themselves in the foot here, since the frequency I reached is actually slightly higher (for all cores) than the frequency reached in our AMD Phenom II 1090T Black Edition review. While there's never a guarantee how far an individual processor/motherboard combination will overclock, it's likely that most 1075T CPUs can be overclocked to be very close if not match or exceed an overclocked 1090T Black Edition.
That being the case, there's little reason to pay $55 more for the 1090T Black Edition, unless the extra versatility of the unlocked multiplier is worth it to you. But it probably isn't: if you had a DDR3-1600 kit, you'd have to drop the memory speed to 1477MHz (the next step up, 1847MHz, probably isn't reachable by most DDR3-1600 kits) with a 277MHz bus, and while the 1090T's unlocked multiplier would let you maintain DDR3-1600 speeds, you won't notice any real world difference between that and 1477MHz.
There is one caveat: while any 890FX motherboard should be able to hit this overclock, you probably won't do as well with previous-generation 700-series or older AM2+ motherboards.
In the next section, I'll explain my conclusions about the AMD Phenom II X6 1075T processor.