EXTREME Overclocking  - AMD Six-Core Phenom II X6 1090T & 1055T Processors Review - Page: 15
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AMD Six-Core Phenom II X6 1090T & 1055T Processors

Date: April 27, 2010
Products: Phenom II X6 1090T & X6 1055T CPUs
Company: Advanced Micro Devices (AMD)
Author: Jason Rabel


Now that these new six-core processors have a turbo mode, things can get a little more interesting. However, in the interest of simplicity I stuck to the old-school method of overclocking. I disabled CnQ & C1E and overclocked all six cores the same speeds. As I mentioned before with the flexibility of AMD's turbo mode, one could clock up to 5 cores at higher speeds (and different clock rates for each core). I noticed in my testing that one particular core had a tendency to fail before the others. If I was so inclined, I could have left this core running at lower speeds and tried to push the others higher... but we can do what-if scenarios all day long.

As always, your mileage may vary... nothing is guaranteed... you break it, you bought it... have fun, and good luck! I would try up to 1.5v for each processor, past that you really don't want to run it 24/7... The CPU cooler I used was a Coolermaster V8 with the fan speed on high. Please remember, I'm just trying to get a ballpark number, even at that broad a range I still spend a LOT of time on this.

I was able to achieve the following (approximate) overclocking results with my 1090T:

  • 3.20 GHz / 1.325v = Stock Speed & Voltage
  • 3.50 GHz / 1.325v = Max Overclock @ Stock Voltage
  • 3.60 GHz / 1.350v
  • 3.70 GHz / 1.400v
  • 3.80 GHz / 1.45v = Maximum Six-Core Stable Overclock

I was able to overclock all the way up to 4.2 GHz (nowhere near stable though), at 4.3 GHz the system would instantly BSOD. I would be interested to see how water cooling or phase-change would benefit these CPUs. I'm sure we will see those results in the coming weeks.

Another area I would like to touch on is overclocking the HT & Memory bus. By default both typically run at 2,000 MHz. With faster speeds of DDR3 memory constantly coming out, it is not uncommon for a person to be running their memory at 1600 MHz (or higher). To maximize performance one can increase the Hypertransport & Northbridge / Memory bus speeds. I did a couple tests at 2,400 MHz & 2,600 MHz with no issues (I'm sorry I didn't get to try higher). There is easily a few percent performance to be gained by increasing these speeds. Just another tip when tweaking your system.

Below is a quick table comparing the AMD Phenom II 1090T with the Intel Core i7 920 both running at 3.8 GHz. While the only change to the AMD chip was increasing the multiplier (and voltage), the Intel chip was running a 200 MHz BCLK (from the default of 133 MHz), which increases the speed of the uncore area significantly (and gives a boost in overall performance). I'm sorry I didn't get a chance to run @ 3.8 GHz with a higher HT / NB bus speed, but one would expect several percent increase in performance by doing so.

Benchmark AMD Phenom II
1090T @ 3.8 GHz
Intel Core i7
920 @ 3.8 GHz
Cinebench R11.5 6.68 6.54
3DS Max 2010 36 s 39 s
wPrime 2.03 7.04 s 7.57 s
x264 HD - Pass 1 83.7 FPS 88.2 FPS
x264 HD - Pass 2 35.6 FPS 35.1 FPS
Photoshop CS4 16.6 s 12.8 s
DiRT 2 - Ultra 49.4 FPS 48.8 FPS
TrackMania 69 FPS 79 FPS
Folding @ Home 1595 PPD 1813 PPD


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