Updated: Tuning Cool'n'Quiet: Maximize Power And Performance
Voltage Ramps, Continued
Phenom II X3 710
Clock | Core Northbridge Voltage |
---|---|
1.6 GHz | 0.925V |
1.7 GHz | 0.95V |
1.8 GHz | 0.975V |
1.9 GHz | 1.0V |
2.2 GHz | 1.025V |
2.3 GHz | 1.05V |
2.4 GHz | 1.075V |
2.6 GHz | 1.1V |
2.695 GHz* | 1.125V |
2.885 GHz* | 1.175V |
2.940 GHz | 1.2V |
3.06 GHz | 1.25V |
* Overclocked: HT and northbridge 7 x 245 MHz
Phenom II X4 945
Clock | Core and Northbridge Voltage |
---|---|
1 GHz | 0.9V |
1.9 GHz | 0.925V |
2.5 GHz | 0.95V |
2.6 GHz | 0.975V |
2.7 GHz | 1.0V |
2.8 GHz | 1.025V |
2.9 GHz | 1.05V |
3 GHz | 1.1V |
3.13 GHz* | 1.125V |
3.25 GHz* | 1.15V |
3.38 GHz* | 1.2V |
3.5 GHz* | 1.25V |
* Overclocked: HT and northbridge 7 x 250 MHz
Phenom II X4 955
Clock | Core and Northbridge Voltage |
---|---|
2.4 GHz | 0.9V |
2.5 GHz | 0.925V |
2.9 GHz | 1.025V |
3 GHz | 1.075V |
3.6 GHz | 1.225V |
Please note that these are synchronous voltage settings for both the core and northbridge. Obviously, with the right motherboard, you'll be able to tweak these settings further by choosing slightly lower core voltages. From our experience with these processors, you can reduce them by about 0.25V.
When overclocking the HyperTransport bus, you'll need to boost the northbridge voltage. Our sample Phenom II X3 710 would only work at 7 x 245 MHz with a voltage setting of 1.025V (compared to 1.0V for 1.9 GHz when not overclocked). And at 4 x 245 MHz, it needed 1.0V (compared to 0.925V for 1.6 GHz when not overclocked). In effect, the K10Stat setting for the processor looks like this:
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Phenom II X3 710
Clock | Core and Northbridge Voltage |
---|---|
3 GHz | 1.25V |
2.327 GHz | 1.05V |
1.715 GHz | 1.025V |
980 MHz | 1.0V |
If you want to be able to have low power consumption and overclock at the same time, Black Edition processors with unlocked multipliers are your best bet.
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DrgnRebrn Nice article! I'm curious to know if the "e" CPUs can be affected in the same way, such as the Phenom II X3 705e. I have chosen this CPU for a HTPC build because of it's already low 65W TDP. Also, what are the effect to power usage when using ACC features & enabling dormant cores?Reply -
cyberkuberiah On the behalf of all readers , Welcome , and so to say , Hi! , Arnawa Widagda :)Reply -
Very good article! Undervolting it's a great tweak to make and most of the people don't even know that it is possible as well as overvolting, getting a power efficient processor for no money! Thanks tom's for caring about this matter.Reply
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autoimmune Inf3rnalI'd like to see same article about Intel i5/i7 power setting tweaking. O my GOD i bet the writers at Toms Hardware had not thought of that, and are not currently in the process of writing that article!Reply
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i love you guys. i have just the system that i am using as HTPC. i was wondering about ways to reduce the power usage as i dont use it for hardcore gaming or any other cpu intensive jobs. all i use it for watching blurays and tv and other movies and songs. i have an ASROCK 790gxh 128M mobo. and 1thlon x2 7750 kuma, that i bought from newegg for $59 (darn steal for the performance it gives. the machine has almost zero latency for any operation)Reply