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Z370 vs Z270: What is the Difference?

Written on September 29, 2017 by Matt Bach


Alongside the new 8th Gen Coffee Lake-S CPUs (Core i3/i5/i7 8xxx) launching on October 5th, Intel has also announced the accompanying Z370 chipset to support these CPUs. While Intel will likely support lower-end chipsets like they have for previous generations, in this article we will be focusing on comparing the Z370 chipset to the previous generation Z270 chipset. These days, new chipsets are rarely very exciting as more and more functionality is moved onto the CPU, but it is often still useful to examine any key changes and improvements.

If you are curious how the new Coffee Lake-S CPUs themselves perform, we will soon have a number of articles available for applications like Photoshop, Premiere Pro, After Effects, Lightroom, Unreal Engine, and many more. Feel free to subscribe to our various lists or simply check back in the future!

Z370 vs Z270 Chipset Specifications

While there are not many changes between Z370 and the previous Z270 chipset, we marked the major differences in the chart below with red. Note that this chart doesn't include all the features available in each chipset, but rather the key points we feel are important. If you wish to see the full set of differences between Z370 and Z270, Intel.com has a comparison chart you can view.

Z370 Z270
Processor Support Coffee Lake-S Kaby Lake-S
Socket LGA-1151 LGA-1151
CPU PCIe Configuration 1x16 or 2x8 or 1x8+2x4 1x16 or 2x8 or 1x8+2x4
Max Additional PCIe lanes* 24x PCI-E 3.0 24x PCI-E 2.0
DRAM Support DDR4 DDR4
Mem/DIMMs Per Channel 2/2 2/2
USB Total 14 (10 USB 3.1) 14(10 USB 3.0)
Max SATA 6Gb/s 6 6
RAID Configuration PCIe 0,1,5 / SATA 0,1,5,10 SATA 0,1,5,10
CPU Overclocking Yes Yes
Intel Rapid Storage Technology (RST) Yes Yes
Max Intel RST for PCI-E Storage 3 3
Intel Smart Response Technology (SRT) Yes Yes
Intel Optane Technology Yes Yes

*In addition to the 16 PCI-E 3.0 lanes from the CPU

Starting from the top, Z370 supports the new Coffee Lake-S CPUs, but interestingly Intel has not changed the socket. itself. So while you can physically install a Kaby Lake-S CPU into a Z370 motherboard or a Coffee Lake-S CPU into a Z270 motherboard, the system would not actually function.

The possible slot configurations for the CPUs 16 PCIe lanes has not changed at all and Z370 doesn't see an increase from the 24 additional PCIe lanes available through the chipset that is available on Z270. The amount of supported RAM has also not changed, although it is worth noting that many of the Coffee Lake-S CPUs themselves now support DDR4-2666 RAM where Kaby Lake-S only supported up to DDR4-2400.

One of the first real differences between the new chipset and the old Z270 chipset is the support for USB 3.1. Going from 3.0 to 3.1 may not seem exciting, but USB 3.1 is actually double the speed (10 Gbps versus 5Gbps) and supports the newer USB Type-C connector. If you are not familiar with this connector, not only does it support up to 100W devices (which hopefully will mean your external drive won't need a power brick) but it is also reversible! No more having to flip over the USB plug five times before it magically ends up in the right orientation.

Lastly, Z370 adds support for PCIe RAID modes of 0, 1, and 5 in addition to the more typical SATA RAID. While RAID 0 (which improves speed) may not be important for many users given that NVMe drives are already fast enough to rarely be a bottleneck, RAID 5 has some interesting possibilities if any motherboards become available that supports three M.2 PCIe drives.


Overall, most of the changes to the Z370 chipset is relatively minor. Obviously the support for the new Coffee Lake-S CPUs is a very big deal, but the odd thing is that for whatever reason Intel decided not to change the physical socket from LGA-1151. This means that you can install a Coffee Lake-S CPU into a Z270 motherboard without the need of a hammer and everything will appear to be correct - only the system will never actually be able to POST or operate correctly.

Besides support for Coffee Lake-S CPUs, the only major changes made are the native support for USB 3.1 and support for PCIe RAID. This may be disappointing for those that were hoping for some cool new technology, but the USB 3.1 support especially is really quite nice to see - especially if Type-C connectors really take off. Even reversible USB connector likely isn't going to be enough by itself to make anyone upgrade from Z270, but honestly the CPUs are what typically drive upgrades, not the motherboard or chipset.

Tags: Coffee Lake-S, Z370, Z270
Jakub Badełek

Guys, there is no USB 3.0 anymore. They are all 3.1 - there is USB 3.1 Gen 1 and USB 3.1 Gen 2: http://www.usb.org/develope...

This is actually very important as it may mislead potential buyers. Now, you should thank USB developers for introducing this confusing mess :-/

Posted on 2017-10-02 12:53:15

As I understand it, "USB 3.0" and "USB 3.1 Gen 1" are the same thing now. In fact the document you linked to says as much.

Because of that, I personally prefer to refer to those as USB 3.0 - and save USB 3.1 for talking about the faster Gen 2 variant. This seems far less confusing to me, though if someone else is talking or writing about USB 3.1 I do have to be careful to see if they mean Gen 1 or Gen 2 (5 or 10Gb/s, effectively).

You are quite correct about the USB devs being responsible for this mess of understanding, though. I don't see why they needed to have the USB 3.1 Gen 1 thing at all: they should have just kept that as USB 3.0, like it had been already, and made the only "UBS 3.1" standard the newer, faster, 10Gb/s version. Oh well :(

Posted on 2017-10-02 17:35:13
Jakub Badełek

Personally I also prefer to use 3.0 name. The trouble is that shops and producers stick to the new naming, confusing people. Similar situation happens with SD cards - their naming is getting more and more complex... if only memory card producers didn't try to cheat on us on every occasion there would be no need for this...

Posted on 2017-10-03 07:19:26

Maybe the USB-IF should be the ones reining in the naming. I mean: LOW SPEED, FULL SPEED, HIGH SPEED, SUPERSPEED and SUPERSPEED+.. Get a grip guys.

Posted on 2017-10-19 06:57:07

Dont forget about MO-MO-MO-MONSTERSPEED

Posted on 2018-01-10 17:30:50


Posted on 2018-01-10 18:27:03

They are similar, but NOT the same. Same speed between USB 3.0 and USB 3.1 Gen 1 (5Gb/s aka USB-SS) but USB 3.1 has a much higher current limit (I think 3000mA, vs USB 3.0 500mA max) for charging laptops etc.

USB 3.1 Gen 2 also has the high power, but also has double speed (10Gb/s aka USB-SSP)

Posted on 2017-12-01 18:01:23

Hmm, I had not considered current / power capabilities. You may have a point there. I hardly ever charge devices from my computer, so it wasn't even on my radar (so to speak). I'm going to look into that a bit more.

Posted on 2017-12-01 18:22:20

Either way in real time these speeds are never attained so it's no biggie at the buyers end.

Posted on 2019-01-13 20:49:02
Odie Bugs

You might have that backwards with Intel. The 3.1 is really 3.0 and Intel has the 3.0 listed in chipset, the 3.1 is a scam as for I/O with same spec as 3.1,. 3.1 gen 2 such as the ASmedia 2142,3142 is a true 3.1 with the 10g and not 5g as with the 3.0. Reality is there's 3.0 but not 3.1 with gen 1 3.1. Giving people the same bus but not changing except for name isn't a true change. Intel loves to change nothing but names and make more while giving the same. The 370 is a sad waste to make money. Now they need to change DMI so the limitation bottle changes with new chipsets. I did always tell them to add more cores to the non-Enterprise CPU which they finally did but left IGPU, I always said add cores and remove it for people who are going to use add-ons.

Posted on 2017-11-01 20:05:45
John Philip Tiongco

business. they are stalling technology advancement.

Posted on 2017-10-05 09:21:23
Nick Anderson Vairo

Coffee Lake is a Six core, so maybe they could've made it work on Z270, but it's likely to have been a janky and unstable.

Posted on 2017-10-09 00:54:15

Hmm maybe Intel want new motherboards?


Posted on 2017-10-20 09:15:05

I have the z270 chipset and i have USB 3.1 GEN 2. 4 og them actually. And I have USB c.

Posted on 2018-06-12 18:12:57