Power Consumption and CPU temperatures
Power Consumption and CPU temperatures
The new Lynnfield based processors have gotten a bit of a redesign and as such they are very energy friendly processors. A processor like the Core i7 870 for example sometimes has roughly even more performance than a Core i7 920 yet consumes only 95 Watts, and that is with all cores stressed. Next to that, clever power management allows the internal voltage and processor multiplier to drop, core independent.
All three processors launched today have a TDP of 95W, coming from 130W for the Bloomfield Core i7 series that's quite an improvement and it shows this during our measurements:
| Power Consumption |
idle |
100% CPU load |
| Core i5 750 (2,66 GHz) 133x20 |
124 |
152 |
| Core i7 860 (2,80 GHz) 133x21 |
124 |
160 |
| Core i7 870 (2,93 GHz) 133x22 |
124 |
162 |
As you can see, these are very respectable numbers. Mind you that this was done with a P55 motherboard, an SSD, optical drive, 8GB memory and GeForce GTX 280 graphics card.
For the best power consumption make sure you have BIOS features like EIST and C1E enabled and within Windows set your performance mode to balanced (allows the processor to clock down).
Temperatures are very good as well. With an air cooler you can expect temps like these:
Temperaturesidle
100% CPU load
Core i5 750 (2,66 GHz) 133x2039
52
Core i7 860 (2,80 GHz) 133x2138
52
Core i7 870 (2,93 GHz) 133x2238
53
This was done with a Thermalright MUX 120 air based cooler. Of course results will vary with different motherboards and cooling solutions. But as a baseline the temperatures definitely are promising, especially with overclocking in mind.
100% CPU load is 4 cores 100% stressed with Prime 95, voltages are left at default, processor Turbo mode is enabled. Overclocked temps of course will differ, but we'll show you that in a split-second.
