How efficient is the 6850k?

[Frankenburger]

I'm finally getting around to pushing my 6850k, and looking at full system load, I've noticed that between 1.24v @ 4.3GHz and 1.3v @ 4.4GHz is about 250w and 285w power consumption with Intel Burn Test.

 

Is this par for the course? I recall my system with the old 5820k @ 1.3v consuming closer to 340w using Intel Burn Test.

[Jurrunio]

Haswell-e is a 22nm part while Broadwell-e is a 14nm part. Probably efficiency gains through process node improvement?

[Frankenburger]

2 minutes ago, Jurrunio said:

Haswell-e is a 22nm part while Broadwell-e is a 14nm part. Probably efficiency gains through process node improvement?

That's possible. Didn't think the difference in node size would affect the voltage to power consumption ratio to that degree. Also, I find it curious that the 6850k is listed as having a 140w TDP, same as the 5820k, despite being on a smaller node, and despite the difference in power consumption.

[Lathlaer]

Overclock3d.net measured about 240w in their test:

 

https://www.overclock3d.net/reviews/cpu_mainboard/intel_6950x_6900k_6850k_cpu_review/4

 

So it seems what you are seeing is entirely within norm.

 

Wanted to check their review of i7 5820k but they didn't include power draw for that one so I found this one from KitGuru's:

 

https://www.kitguru.net/components/cpu/luke-hill/intel-core-i7-5820k-haswell-e-6-core-cpu-review/8/

 

Again, seems what you are seeing is entirely normal.

[Jurrunio]

54 minutes ago, Frankenburger said:

That's possible. Didn't think the difference in node size would affect the voltage to power consumption ratio to that degree. Also, I find it curious that the 6850k is listed as having a 140w TDP, same as the 5820k, despite being on a smaller node, and despite the difference in power consumption.

TDP readings are usually inaccurate. For example, the 6 core 7800x is rated at 140w, just like the 12 core 7920x. While the clock speed on the 12 core is noticeably lower, I dont think it will kick out less heat than the 6 core at stock.