Intel's 10nm Cannon Lake and Core i3-8121U Deep Dive Reviewby Ian Cutress on January 25, 2019 10:30 AM EST
Anyone interested in leading edge semiconductors knows that Intel is late with its newest manufacturing process. The '10nm' node was first announced in 2014, to be released in 2016. While officially 'shipping for revenue' by 31 December 2017, the only way we knew to get hold of an Intel 10nm x86 CPU was if you happened to be a Chinese school and work with a specific distributor to buy a specific laptop.We pulled in a few favors from within the industry and managed to source the laptop for review.
Intel's Sole 10nm Processor
The single processor from Intel built on 10nm falls under the Core 8th generation family, and is called the Core i3-8121U. The cores are built with Intel's Cannon Lake microarchitecture, a variant of the Skylake architecture built on 14nm, and it is manufactured as a dual core with integrated graphics. The part nominally has a standard 'GT2' graphics configuration, but is actually shipped without the graphics enabled - some analysts believe that this is because it doesn't work (see more on the next page). Norminally this is a 2+2 design (two cores, GT2 graphics), however it might also be referred to as a 2+0 design.
|Intel 10nm Cannon Lake CPUs|
|Core i3-8121U||2 (4)||2.2 GHz||3.2 GHz||None
The two cores run at a 2.2 GHz base frequency at 15W thermal design power, and offers a 3.2 GHz turbo frequency. Memory support includes LPDDR4, one of very few Intel processors to do so, but also this processor has AVX-512 capabilities, allowing it to process vector math much like Intel's Enterprise class hardware but now in a low end chip. We'll dive deep into all these points in this review.
What Do We Have
The sole laptop which has an Intel Core i3-8121U inside is a specific model of the Chinese Lenovo Ideapad E330-15ICN.
This is an educational focused device, with educational focused specifications - a 15.6-inch screen running at a 1366x768 resolution with a TN panel (with limited viewing angles), a small 33.4 Wh battery, 8GB of DRAM, a 256GB SSD, and a 1TB mechanical hard-drive. Because the chip has no integrated graphics, Lenovo had to add a physical GPU, which will be the same one as found in the upcoming NUC: AMD's Radeon RX540. This adds another 50W thermal design power to the whole unit, which complicates the cooling system considerably compared to a standard 15W CPU on its own. Along the educational theme, it also comes with an ethernet port, a HDMI port, two USB ports, a 3.5mm jack, a Type-C USB connector, a 720p webcam, a microSD card slot, an 802.11ac Wi-Fi module, and an optional DVD slot (which loses the second SATA HDD).
The design is very unassuming. The grey finish means that it won't stand out at Starbucks, aside from the bulk of a heavy 15.6-inch device. As is perhaps to be expected, it feels very utilitarian. No-one is buying this for looks or for style.
The keyboard fits in with the cost-down implementation here, although having used it for a few events to take notes, it is very usable. Despite being a Chinese device, we ended up with a US keyboard, but with half-height arrow buttons. The keypad is also present, with some media keys at the top. Unfortunately the power key is on the top right, above the minus sign, making it very easy to hit for prolific users of a keypad.
On the top is the webcam. This unit has massive bezels for the display, which contributes a lot to the bulk of the system. The webcam is usable for meetings at least, and the microphones do work but are cheap as we expect.
Welcome to the heart - Intel Core i3 plus AMD Radeon graphics. Sadly not an impressive combination like Kaby G.
On the sides are all of the ports. They are all located on the left side, and include the power connector, the gigabit Ethernet port, a HDMI port, two USB ports, a 3.5mm jack, a Type-C USB port, and an SD card slot. On the other side of the unit is the removable bay.
On the rear, we get intakes at the front, and an intake in the middle of the bottom of the chassis. There are small rubber feet to help lift the laptop when on a table, but these do not really help on a lap. Given the amount of heat that needs to be dissipated in this system, this isn't great - the exhaust is found in the hinge between the main body and the display. The fan inside has to cope with all of this, as we'll see in a bit.
Going inside the system, and removing the removable bay, looks a bit like this.
On the left is the 256GB SSD, branded as an 'MT Black Gold 400' drive in a 2.5-inch chassis. This unit is very gold. It is a budget drive, featuring the DRAM-less Silicon Motion SM2246XT controller combined with Spektek NAND flash (rebadged cheap Micron NAND). This unit is clearly part of a series of SSDs, given the number of empty pads. But I guess even having an SSD is still an interesting upgrade over a purely mechanical drive.
The other drive in the system, not pictured in the main image, is spinning rust - a 1TB WD Blue. This is actually pretty commendable to have this drive in a system like this, although the 5400RPM platter speed means that it will be slow for almost everything. It makes me wonder if drives like this should be using the SSD as a caching technology instead.
The WiFi module has a Lenovo part number but underneath is a Realtek RTL8821CE 802.11ac module, supporting 433 Mbps speed (1T1R) and Bluetooth. This is an M.2 module, which means it could be upgraded at a later date fairly easily. It is a dual band module, which as an educational system should be more than suitable for the classroom that has an access point close by.
The battery, as mentioned above, is a tiny battery. The 33.4Wh lithium-ion unit is a 2-cell device, which equates to 4400 mAh at 7.6 V, and is made for Lenovo in Thailand by the Nanjing Nexcon Electronics Co.
For system memory, the unit has 4GB soldered onto the rear of the PCB, and offers a single SO-DIMM slot for an additional module. The base configuration for this device has 4GB of memory in single channel mode, however up to 16GB more can be added. The configurations we were offered showed another 4GB module, bringing the total up to 8GB. Again, having 8GB of DRAM in an educational device probably sits about right, and kudos for them being in dual channel as well.
The meat of the laptop, the CPU and GPU, are found near the center and have blower cooling. Despite the 15W TDP of the CPU and the 50W TDP of the GPU, there is a single flat heatpipe going from the CPU to the GPU and to the heatsink connected to the thin blower fan. This feels like a cheap fan paired with aluminum fins. This feels woefully inadequate for such the system, and the power consumption combined with the small battery leads to interesting figures for battery life. In thermals, the system does get warm to the touch around the cooler area, which is thankfully a little way away from the keyboard and not really felt when active.
The GPU area has a sizable copper heatsink fixed in two spots to the PCB.
The CPU area is instead attached at three points, and there is an additional pad to stop the chassis from rubbing against the heatpipe. This means that the chip height combined with the PCB and the heatsink is enough to start to worry how the chassis brushes up against the internals? Interesting.
Underneath the heatsink is this chip. What we have here is the 2+2 die from Intel (with graphics disabled, so 2+0 as shipped), along with the chipset. Back when Intel showed off a full wafer of these chips, we calculated a rough die size of 8.2mm by 8.6mm, or 70.5mm2 per die. In actual fact, we were essentially accurate in our estimation. This means there can be up to 850 dies per 300mm wafer. How many of those actually work at the level Intel wanted? That would be a fun question to have answered.
The base model of this device retailed for around $450 from our source in China - that's the 4GB model with a 500GB HDD. With the extra memory (up to 8GB) and storage (256GB SSD + 1TB HDD) the cost to us was around $650, plus postage. It took about six weeks to get the device, after calling in a few favors from friends in the region. For everyone else, a NUC was recently released onto shelves in December.
Within this article we want to do several things. Firstly, discuss and describe the history behind Intel's 10nm plans, the claims and the marketing, as well as what we currently know about what is in this 10nm Cannon Lake processor. Then we will go into what Cannon Lake brings to the table in its microarchitecture based on what we can find out, using tools, microbenchmarks, and also calling in some investigative experts. Following this is some benchmarks - we want to look into both generational improvements and chip production performance increases, coming at the performance angle but also a nod towards power and memory performance. Finally we'll end with a discussion about the future of this version of Intel's 10nm.
It should be noted that Intel did not offer or provide the device for this article - we purchased this device ourselves. When asked about diving deeper into the design of the chip about a month ago, Intel never really responded to my request. I currently have a more recent request to discuss the topic, and I'm waiting on a response.
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jjj - Friday, January 25, 2019 - linkBored with laptops, want a large foldable phone with a projected keyboard so i can forget about these bulky heavy things. Ok, fair enough, glasses are way better but those will take a while longer.
eastcoast_pete - Friday, January 25, 2019 - link@Ian: Thanks for the deep dive, and giving the references for background! One comment, three questions (they're related): In addition to being very (overly) ambitious with the 10 nm process, I was particularly struck by the "fused-off integrated graphics" and how Intel's current 10 nm process apparently just won't play nice with the demands in a GPU setting. Question: Any information or rumors on whether that contributed to AMD going the chiplet route for Ryzen going forward? In addition to improving yields, that also allows for heterogeneous manufacturing nodes on the same final chip, so that can get around that problem. Finally, any signs that Intel may go down that road in its upcoming mainstream chips? Any updates on what node they will make their much-announced dGPUs on? Probably won't be this or a related 10 nm process.
Lastly, and maybe you and Andrei can weigh in on that: TSMC's (different) 7 nm process seems to work okay for the (smaller) different "iGPUs" in Apple's 12/12x, Huawei's newest Kirin and the new Snapdragon. Any insight/speculation which steps of Intel's 10 nm process cause the apparent incompatibility with GPU usage scenarios?
Rudde - Saturday, January 26, 2019 - linkAMD has lauched huge 7nm desktop graphics cards (2 server and Radeon VII). AMD does not seem to have any problems making gpus on TSMC 7nm.
eastcoast_pete - Sunday, January 27, 2019 - linkThat's why I asked about the apparent incompatibility of GPU-type dies with Intel's 10 nm process. Isn't it curious that this seems to be the Achilles heel of Intel's process? I wonder if their future chips with " iGPU" will use a chiplet-type approach, with the CPU parts in 10 nm, and the GPU in 14 nm++++ or however many + generations it'd be on. The other big question is what process their upcoming high-end dGPU will be in Unless, Intel let's TSMC make that for them, too.
velanapontinha - Friday, January 25, 2019 - linkEvery time I read Kaby G I'm instantly stormed by a Kenny G theme stuck in my head, and it ruins the rest of my day.
skis4hire - Friday, January 25, 2019 - link"Fast forward several months later, to May 2018, and we still had not heard anything from Intel."
Anton covered their statement in April, where they indicated they weren't shipping volume 10nm until sometime in 2019, and that they would instead release another 14nm product, whiskey lake, in the interim.
Yorgos - Friday, January 25, 2019 - link>AMD XXXXX (XM/XT, XXW)
Thanks Ian for reminding us is every article, that we are reading a Purch media product, or a clueless editor.
Don't forget, 386 was o 0 core CPU.
No, it doesn't bother me as a reader, it bothers me as an engineer who designs and studies digital circuits. But hey you can't have it all, it's hard to find someone who is capable at running windows executables AND know his way in comp. arch..
Ryan Smith - Friday, January 25, 2019 - linkWhile I'm all for constructive feedback, I have to admit I'm not sure what we're meant to be taking from this.
Could you please articulate in more detail what exactly is wrong with the article?
KateH - Saturday, January 26, 2019 - linki interpreted it as,
"I disagree with the distinction between 'modules' and 'cores' that is made when some journalistic endevours mention AMD's 'Construction' architecture microprocessors. I find the drawing of a line based on FPU counts inaccurate- disengenous even- given that historic microprocessors such as the renowned Intel 80386 did not feature an on-chip FPU at all, an omission that would under the definitions used by this journalist in this article cause the '386 to be described as having 'zero cores'. The philosophical exercise suggested by such a definition is, based upon my extensive experience in the industry of digital circuit design, repugnant to my sensibilities and in my opinion calls into question the journalistic integrity of this very publication!"
or something like that
(automatically translated from Internet Hooligan to American English, tap here to rate translation)
Ryan Smith - Saturday, January 26, 2019 - link"tap here to rate translation"
5/5 stars. Thank you!