OverclockingDesigned to support high clocks, the AMD FXs have attracted plenty of attention when it comes to overclocking, with AMD proudly announcing recently that it had beaten the frequency record for x86 processors, clocking up to no less than 8429 MHz using liquid helium. They didn't stabilise the processor at this clock but rather this is the maximum clock obtained with extreme cooling on just one module. What about more standard overclocking? We tried to overclock our FX-8150 using a Noctua NH-U12P SE2, still on the M5A99X EVO.
By setting CPU Load Line Calibration to High and adding Offset 0.16v to the processor voltage we managed to stabilise the processor at a clock of 4.6 GHz in Prime95 by using an x23 multiplier – this is unblocked on the FX range, an advantage when compared with the fact that you have to pay extra for an Intel K model.
4.6 GHz is pretty good but why stop us when we’re enjoying ourselves? Simply because energy consumption was already very high at this setting.
In comparison to the base configuration, in CPU load in Fritz Chess Benchmark the energy consumption at the wall socket increased from 206 to 313 Watts and from 109 to 206 Watts at the ATX12V. This gives 14602 kilo nodes per second, which is 23% better than the default setting, not that much for what is almost double the processor energy consumption.
In Prime95, energy consumption at the ATX12V went up as far as 255 Watts and during overclocking tests where we pushed things even further we recorded hellish energy consumption levels of up to 300 Watts at the ATX12V. While the AMD FX may impress in terms of extreme overclocking, things seem more complicated for daily usage... It remains to be seen if the versions on sale in stores will offer better results. When it comes to undervolting, we didn’t manage to do any better than 0.05V, which economises around 10 Watts.