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Tuesday | November 30, 2021
Intel Core i7-3930K vs Core i7-3820 vs FX-8150 vs 990X vs 2700K Review

Intel Core i7-3930K vs Core i7-3820 vs FX-8150 vs 990X vs 2700K Review

Intel Sandy Bridge Extreme Core i7-3930K and Core i7-3820 vs AMD FX-8150, Core i7-2700K and Core i7-990X

Power Use, Temperatures and Overclocking

To test the power and thermal performance of the systems we ran each at idle and full load with our cooler at full RPM. The results are shown below.

  Idle CPU Load
(Auto/Quiet Profile)
i7-3930K System Power 122w 289w
i7-3820 System Power 120w 229w
i7-990X System Power 152w 265w
i7-2700K System Power 123w 214w
FX-8150 System Power 141w 285w
i7-3930K Temperature 30°C 61°C
i7-3820 Temperature 31°C 51°C
i7-990X Temperature 31°C 61°C
FX-8150 Temperature 41°C 59°C

One of the first results which jumps out in the above comparison is the idle power use where the socket 2011 CPUs sit at a similar level to the i7-2700K, 20w below AMDs idle power. When we apply full load to the CPU the 6 core Intel model increases to similar power readings as the FX. The i7-3820 also takes a significant jump to a little above the 2700K however it is still much more energy friendly than the older 990X and AMD FX.

For temperatures when using the stock Intel and AMD liquid coolers we see that the thermal profiles of each cooler limit the chips to around 61°C however the i7-3820 with its lower number of cores and TDP is a cooler running chip and never goes above 51°C.

There is no doubting that the i7-3960X is an enthusiast CPU with its fully unlocked multipliers, higher cache and faster turbo but there is still plenty of flexibility in the other chips. The i7-3930K for example has fully unlocked multipliers which allowed us to hit 4.875GHz (39x125MHz), just a little less than we have seen our 3960X hit. The i7-3820 is a little more complicated though as it has partially unlocked multipliers but that won’t be an issue for many users as speeds of up to 4.75GHz (38×125) were achievable on our stock Intel liquid cooler… anything more really will need something more exotic and that’s where the higher spec chips become more suitable anyway.

  Stock Overclock
Core i7-3930K 3.2GHz 4.875GHz
@ 1.4v (39×125)
Core i7-3820 3.6GHz 4.75GHz
@ 1.4v (38×125)

About Author

Stuart Davidson

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