i7-6770HQ has ed ram, notice it is 770
i7-6700HQ has no ed ram, notice it is 700
Both i7 6770HQ and i7 6700HQ are 2.6 ghz base, 5 turbo bins higher for 3 or 4 cores (3.1 ghz), 7 bins higher for 2 cores (3.3 ghz), 9 bins higher for 1 core
The only difference is ed ram or no ed ram, and the i7 6770HQ has 72 EU while the i7 6700 has 24 EUs. But in CPU tasks that are minimal for the gpu in theory the higher amount of EUs would automatically dynamically shut off most of those extra gpu cores.
So here are the anandtech reviews with the i7 6770HQ (effectively it is only the nuc, and he tested the nuc with different rams)
http://www.anandtech.com/print/10602/memory-frequency-scaling-on-skull-canyon
Here are the anandtech reviews of the non ed ram i7 6700HQ
http://www.anandtech.com/print/10116/the-dell-xps-15-9550-review (note this review is newer so it has many of the same benches side by side with the y700 in the same chart)
http://www.anandtech.com/print/10026/the-lenovo-ideapad-y700-laptop-review
Or use bench to make it easier to compare
http://www.anandtech.com/bench/product/1631?vs=1635
As you can see for CPU tasks ED ram rarely makes a difference. Unfortunately in the laptop reviews they did not show the tasks where memory latency matters the most, but understand such tests are actually the abnormal things in most work.
That said most things do not benefit much from EDRAM. This is because EDRAM is only barely faster on a latency perspective than ddr3 or ddr4 (both ddr3 and ddr4 are in the same general domain on latency) . Now ddr4 has higher bandwidth generally than ddr3 and edram has higher bandwidth than dual channel ddr4.
As an analogy.
Imagine you have a 2 lane highway. The highway can have a speed limit set at 50 mph, 60, 70, or 85 mph. This is latency
Bandwidth is whether you have a 2 lane highway or a 8 lane highway. Having a wider highway does not make the individual cars go faster, it does not change the speed limit it just allows more volume to occur. Most apps are not bandwidth limited, but decreasing the latency making it faster to retrieve things from memory can help certain types of programs that can't fit the data in the L1, L2, L3, etc caches.
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Side rant about a new cool and upcoming technology. Intel / Micron's 3D XPoint, the thing like NAND but so much better.
3D Xpoint, also known as intel Optane or Micron Quant X has latency that is an order of magnitude lower than ram. That said it is two almost three orders of magnitude faster in latency than ssd.
The big benefit of 3D Xpoint is not bandwidth but once again latency. That and it is non volatile, you can access the files directly instead of reading the entire block of memory, lower power etc.
One of the big things in the future with 3D Xpoint or some similar technology from a different company is how certain workloads will now have things that are effectively ram drives instead of ssd which in turn replaced hard drives.
This is speculation. Depending on cost on price per gb and how many dies of 3D Xpoint and dies of NAND it would take I would not be surprised in the far future (not the next 18 months) that we will eventually see hybrid drives with a 128gb or so (OS or programs) are always stored in 3D Xpoint, and a SSD acting like a 1 TB or 2 TB Hard Drive but it is now SSD all on one package treated as a one drive letter. That said it will be at least 18 months or so, for right now the higher profit per each die of 3D Xpoint produced would be targeting the server workloads where they are working to pool ram and 3D Xpoint where it appears as 1 volume per software, and they stagger it so where it would be a big speed up for certain
3D Xpoint also may be benefits in low power devices (phones and internet of things) once the server market is saturated and you will see intel and micron target the more consumer market. Very small amount of ram (possibly no ram at all in IoT) and the rest being 3D Xpoint and little to no nand since data would be stored in the cloud and you do not need to use nand.