The Intel Broadwell-E Review: Core i7-6950X, i7-6900K, i7-6850K and i7-6800K Tested
by Ian Cutress on May 31, 2016 2:01 AM EST- Posted in
- CPUs
- Intel
- Enterprise
- Prosumer
- X99
- 14nm
- Broadwell-E
- HEDT
Load Delta Power Consumption
Power consumption was tested on the system while in a single MSI GTX 770 Lightning configuration with a wall meter connected to the OCZ 1250W power supply. This power supply is Gold rated, and as I am in the UK on a 230-240 V supply, leads to ~75% efficiency > 50W, and 90%+ efficiency at 250W, suitable for both idle and multi-GPU loading. This method of power reading allows us to compare both the power management of the BIOS and the board's ability to supply components with power under load, and includes typical PSU losses due to efficiency.
Each of the Broadwell-E SKUs are rated at 140W, however they vary between 6 cores and 10 cores and with different frequencies. Normally one would assume that the core/frequency ratio would be adjusted to match TDP, but ultimately using more cores can consume more power. We see a distinct increase in power consumption moving up the product stack.
Prime95 Core Loading
For this review, we also looked into peak delta power draw when varying the number of cores using Prime95’s mode for peak power consumption. Prime95 identifies cores with multiple threads and adjusts its loading/pinning accordingly.
Broadwell-E Overclocking
Methodology
Our standard overclocking methodology is as follows. We select the automatic overclock options and test for stability with PovRay and OCCT to simulate high-end workloads. These stability tests aim to catch any immediate issues with memory or CPU errors.
For manual overclocks, based on the information gathered from previous testing, we start off at a nominal voltage and CPU multiplier, and the multiplier is increased until the stability tests are failed. The CPU voltage is increased gradually until the stability tests are passed, and the process repeated until the motherboard reduces the multiplier automatically (due to safety protocols) or the CPU temperature reaches a stupidly high level (100ºC+). Our test bed is not in a case, which should push overclocks higher with fresher (cooler) air.
Overclock Results
Due to time constraints we were only able to overclock the i7-6950X using the MSI X99A Gaming Carbon motherboard. MSI has improved its overclocking options as of late on the Z170 platform to make it easier to use, but our BIOS did not have those most recent updates, particularly for load line calibration. However, our sample hit 4.1 GHz at 1.30 volts before the OCCT load temperatures were prohibitive to move up any further. We saw similar things when testing the mainstream Broadwell parts with Iris Pro, which shows that this sort of overclocking performance might be indicative of the silicon itself.
That being said, speaking with our contacts at various motherboard manufacturers, we're told that 4.1 GHz is a reasonably average processor result for Broadwell-E. Some processors will hit 4.3 GHz on air at around the same voltage, whereas others need up to 1.4 volts, and thus results will depend on the cooling setup used or the thermal characteristics of the silicon. I have also been told that AVX is a different story: for any peak frequency attained normally, AVX overclock stable frequencies will be around 200-300 MHz lower.
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piroroadkill - Tuesday, May 31, 2016 - link
Shitty pricing, lame increases in performance.I really hope Zen lights a fire under their ass.
aggrokalle - Tuesday, May 31, 2016 - link
Hi Ian, is the Intel Thermal Solution TS13A compatible with the thinner package of the Broadwell-E? I didn't find any informations on the intel website. Don't wonna break my shiny new toy :pGodofmosquitos - Tuesday, May 31, 2016 - link
Honestly - as the article itself mentions, the EE-line of CPU's have just fallen too far behind to be considered serious options for enthusiasts. At least imo. I still have a 980X clocked at 4GHz. And it runs everything with stellar performance. That was the last time Intel had an EE-CPU which was ahead of the curve. Also, as PCI-E 4.0 will seemingly require a new platform, due to lacking backwards compatibility of PCI-E 4.0 cards with 3.0 slots, I seriously cannot see anything justifying an upgrade before '18, when PCI-E 4.0 is out, we're on 10nm, and Intel Optane disks are readily available.Godofmosquitos - Tuesday, May 31, 2016 - link
Or well, for "the average" enthusiast at least ^^Impulses - Tuesday, May 31, 2016 - link
What I really don't get is why the 6800K is still saddled with a lower lane count... Aren't the price hikes and the lag to market enough of an HEDT differentiator? Is the lower lane count something that helps yields?They've gone backwards, from having an attractively priced 5820K that could lure some Z170/6700K buyers to basically making HEDT as irrelevant as possible unless you absolutely need the extra cores.
A lot of enthusiasts that don't NEED 6+ cores but COULD benefit from it (photo/video work in the side etc) would be all over a more attractive and less ignored HEDT lineup.
rhysiam - Wednesday, June 1, 2016 - link
I totally agree. I'm due for an upgrade and put myself exactly in that category of photo + video work on the side and being "lured" towards a 5820K. But the price hikes, lag to market and practically 0 performance seems to have pushed the "HEDT" line from enthusiast to niche. Reading this review I don't want anything to do with it.We've waited almost 2 years since the Haswell-E launch and the "update" offers significantly worse price/performance ratios.
Especially with Skylake having plenty of PCIe lanes, with the right motherboard you're covered for 2 graphics cards (or 1 plus a RAID controller), several PCIe SSDs and a 10GBps NIC... plenty for the foreseeable future. Intel is making the cost of these 6+ core CPUs (both in terms of $$s and in the sacrifice you have to make in single threaded performance) larger and larger.
My worry is that pushing up HEDT prices will allow them to bump up the prices of high end mainstream CPUs. Let's see how much the overclockable Kaby Lake i7 costs shall we? I sure hope Zen can shake things up.
adamod - Wednesday, June 1, 2016 - link
market segmentation....no other reasonmapesdhs - Thursday, June 9, 2016 - link
Doubly backwards given the 4820K was a 40-lane chip, whereas the 5820K isn't. It means a 4820K/X79 can do things for gaming with SLI/CF (and still have lanes for storage and other stuff) which a 5820K and 6800K can't.rodmunch69 - Tuesday, May 31, 2016 - link
I had a 980x and then upgraded to a 3930k... 4 years ago. The 2 extra cores were great and useful, but otherwise there wasn't a big difference between the chips. Reading this it doesn't seem like the base 6800k is really much of an upgrade over a 3930k. I've been wanting to upgrade if there was a reason to do so, but Intel again isn't giving me one. One thing however with the 980x is the motherboards and the related chipsets, that's where you'd see a big difference going with something like a 6800k and it would be the reason I'd move off a 980x, but only if I was looking for a reason to move.rodmunch69 - Tuesday, May 31, 2016 - link
I've had a 3930k for 4 years now and I still don't feel much of a need to upgrade. What is going on with Intel? They seriously need a competitor to kick them in the rear and push them ahead.