Sign in with
Sign up | Sign in

Power, In Depth: Stock Clock Rates

Intel Core i7-5960X, -5930K, And -5820K CPU Review: Haswell-E Rises
By , Igor Wallossek

Our German lab went the extra mile for drilling down into power consumption, cutting the braiding from our power supply's cables to give us the same measurement capabilities you've seen in our graphics card launch coverage. The readings are based on the four-channel HAMEG HMO 3054 oscilloscope.

Consumption is measured at two different points, allowing us to, for the first time, quantify how much power is lost to the voltage regulators. This amount isn’t negligible; we’re providing infrared measurements as well to drive that point home.

Power Measurement Platform
System
Intel Core i7-5960X
MSI X99 Gaming 7
16 GB G.Skill Ripjaws DDR4-2666 (4 x 4 GB)
Samsung 850 EVO 512 GB
Raijintek Water Cooling
be quiet! Dark Power Pro 1200 W
Microcool Banchetto 101
Method
No Contact Current Measurement at All Rails
Direct voltage measurement
IR real-time monitoring
Equipment
1 x HAMEG HMO 3054, 500 MHz four-channel oscilloscope with data logger
4 x HAMEG HZO50 current probe
4 x HAMEG HZ355 (10:1 probe, 500 MHz)
1 x HAMEG HMC 8012 DSO with data logger
1 x Optris PI450 80 Hz Infrared Camera + PI Connect

Infrared Measurements with the Optris PI450

Interestingly, we’ve identified a method to confirm what our sensors tell us in the form of the PI450 by Optris.

This piece of equipment is an infrared camera that was developed specifically for process monitoring. It supplies real-time thermal images at a rate of 80 Hz. The pictures are sent via USB to a separate system, where they can be recorded as video. The PI450’s thermal sensitivity is 40 mK, making it ideal for assessing small gradients.

In order to overclock our CPU even more aggressively, we’re using a new water cooling solution by Raijintek. Consequently, we’re not just interested in the CPU temperature, but also the water temperature, which stays constant after the heat-up phase.

Additionally, the Banchetto 101 allows us to switch the system to a vertical orientation with the use of two angled brackets. This way, we can shoot interesting videos of the back of the motherboard as well. For this, we speed up 20 minutes of HD video so that it completes in two minutes. We record the back of the CPU socket and the voltage regulators to document the heat generation and transmission.

Intel Core i7-5960X at 3.0 GHz with Turbo Boost

Core Voltage

The first experiment involves core voltage. Our measured average of 1.0 V is a bit higher than the motherboard's setting, but we're getting an average of 3.2 GHz from this eight-core processor, so there's hardly room for complaint.

Power Draw

Next, we compare the values measured through the voltage regulator's sensor to those measured at the motherboard's input (at the same time). This tells us how much power is lost to factors other than the Core i7 processor. These findings will come in useful later, since losses attributable to voltage regulation needs to be taken into consideration when deciding on an optimal system setup.

The eight-core CPU looks pretty good, demonstrating 15 W (19 W, given VRM losses) at idle and 93 W (106 W, considering the VRM) under load.

Power Consumption
Average, Idle
Maximum, 100% Load
Average, 100% Load
CPU 12 V In19 W
122 W
106 W
CPU Package
15 W
96 W
93 W
VR Loss
4 W
26 W
13 W

Temperatures

Due in no small part to our liquid cooling system, idle temperatures are pleasantly low. The processor interface reading was 32 degrees Celsius, and the core temperature average 27 degrees. That was only five degrees above ambient.

Let’s take a look at the time-lapse video mentioned earlier.

Temperature T
Idle
Maximum, 100% Load
Average, 100% Load (Heated Up)
Core
27 °C
44 °C
41 °C
Package
27 °C
45 °C

Water (In / Out)
24 °C / 27 °C
31 °C

VR
34 °C
44 °C

Now, what happens when the CPU is overclocked, and how much can be saved by utilizing two cores less? Those questions are answering by varying our efforts to tune Intel's new flagship.

For an eight-core processor that runs stable at 3.2 GHz with all cores at full load, 93 W  (or 106 W with VR losses taken into account) isn't bad.

Add a comment
Ask a Category Expert
React To This Article

Create a new thread in the UK Article comments forum about this subject

Example: Notebook, Android, SSD hard drive

Display all 7 comments.
  • 1 Hide
    wireframed , 29 August 2014 18:24
    Well, that's a bit of a mixed bag. The review was nice, though.

    Personally, the 3DS and After Effects benchmarks were of most interest, since they are what I spend most of the CPU time on. (3DS in particular, right now I'm logging dozens of CPU hours a day on 3DS alone). It's pretty clear that unless the platform costs of Haswell-E are much higher than IB-E, going with the old won't make sense. The 5930k beats the 4960X. which is at least 50% more expensive.

    I've been waiting forever for an upgrade to my i7 930 based workstation, and I didn't feel like jumping on an IB-E a couple months before a brand-new HEDT platform is released.

    I had hoped Haswell-E would be a bit more impressive, but OTOH, investing in a DDR4 platform now might be a good idea, given my workstations typically have 3-4 years in them. At the very least, a drop-in upgrade to Broadwell-E would be nice to have as an option.

    Now to see how big a pounding I'll take in Denmark for X99/DDR4/Haswell-E... :o 
  • 0 Hide
    haider95 , 30 August 2014 17:56
    sweepstakes only for US users?
  • 0 Hide
    Robi_g , 30 August 2014 22:06
    Text on the competition PC says EVGA motherboard, but the picture has an ASrock one.
  • -1 Hide
    Robi_g , 30 August 2014 22:06
    Text on the competition PC says EVGA motherboard, but the picture has an ASrock one.
  • -1 Hide
    Robi_g , 30 August 2014 22:07
    Text on the competition PC says EVGA motherboard, but the picture has an ASrock one.
  • -1 Hide
    BigBadBeef , 2 September 2014 05:45
    I am an enthusiast and even I say "NO" to this marketet prototype. I will not participate as Intel's guinea pig.
  • 0 Hide
    LePhuronn , 4 September 2014 14:59
    Although I agree with the logic behind the "smart choice" at the end of this article, in the real world the PCI-E lane count for gaming is a moot point. X99 is NOT a gaming platform. It is a workstation and productivity platform. Regardless of how much you hobble your CPU, you're still paying £300 for the motherboard and £400 for comparatively paultry amounts of RAM, so the price of overall Haswell-E adoption is very high.

    Therefore anybody who's going to load up on GPUs enough to worry about PCI-E lanes will have sufficient money to drop in a 5960X on principle. Anybody who's adopting X99 for productivity purposes will not skimp on core count and also go 5960X, especially considering they're likely to go at least 32GB RAM and therefore shelling out a lot of money. Those producing on CUDA cards may not even go X99 at all because 1150 Haswell has more than enough power to run the software. Folders and CUDA Miners similarly will want all GPUs running at full tilt so will likely invest in the 5960X to get all the PCI-E lanes.

    So really, the only "smart choice" is 5960X or don't go X99 at all.
React To This Article