The final piece of AMD’s return to high-performance computing is in laptops. While Ryzen, Threadripper, and EPYC have used the 8-core Zeppelin building block for their products, the laptop side of the equation will combine the new high-performance Zen core with the latest Vega graphics in a single piece of silicon. AMD is now set to release the results of their efforts: a single silicon chip offering four Zen cores, up to 10 Vega compute units, and a unified power delivery system all in under 15W, with AMD touting +200% CPU performance and +128% GPU performance over its previous generation of laptop processors. HP, Lenovo and Acer are releasing laptops based on the Ryzen Mobile hardware today (or soon), and we expect to see more OEMs at CES in January with their offerings.

Two APUs Now, More Later

To start, AMD is launching a pair of low-power processors for the laptop market: the Ryzen 7 2700U and the Ryzen 5 2500U. Both of these processors combine four of AMD’s latest Zen cores, with some minor improvements, with AMD’s latest Vega graphics, into a single piece of silicon. These are both 15W processors, using the U-suffixed nomenclature that Intel has popularized for its 15W parts. By developing around a 15W TDP, AMD is aiming for the same range of thin and light notebooks that are currently almost entirely Intel-powered, while also using the Vega graphics architecture as a significant selling point in gaming and enthusiast workload acceleration. AMD has also gone into detail about a number of power-saving technologies that is has developed and implemented to provide better battery life.

AMD Ryzen Mobile APUs
  Ryzen 7 2700U
with Vega 10
Ryzen 5 2500U
with Vega 8
CPU Quad-Core with SMT
2.2 GHz Base
3.8 GHz Turbo
Zen Cores, 14nm
Quad-Core with SMT
2.0 GHz Base
3.8 GHz Turbo
Zen Cores, 14nm
Dual Module
2.7 GHz Base
3.6 GHz Turbo
Excavator, 28nm
GPU Vega 10
10 CUs (640 SPs)
Up to 1300 MHz
Vega 8
8 CUs (512 SPs)
Up to 1100 MHz
GCN 1.2
8 CUs (512 SPs)
Up to 758 MHz
TDP 15W 15W 15W
DRAM Up to DDR4-2400 Up to DDR4-2400 Up to DDR4-1866
L2 Cache 512 KB/core 512 KB/core 1 MB/module
L3 Cache 1 MB/core 1 MB/core -
PCIe Lanes ? ? 8 x PCIe 3.0
Die Size 209.78 mm2 209.78 mm2 250.4 mm2
Transistors 4.95 billion 4.95 billion 3.1 billion
Launch October 2017 October 2017 May 2016

Both APUs will have four CPU cores and simultaneous multi-threading, giving eight threads total. The rated base clock for the processors will be in the 2.0 GHz range, although AMD states that the typical all-core turbo will be much higher than this (more about it later). CPU boost frequencies are 3.8 GHz for the Ryzen 7 2700U and 3.6 GHz for the Ryzen 5 2500U, which sound very high for 15W processors but AMD has stated that this frequency combination is more in the efficiency sweet spot for the processor design. Like its competitor, OEMs can use these processors in configurable TDP modes, which AMD states are from 9W to 25W. We are under the impression that these power modes do not change the frequencies, but merely affect the turbo profile which we’ll discuss later.

The four cores will be in a single core complex (CCX), which AMD states will alleviate some of the questions about CCX-to-CCX latency that were present in the dual CCX design for the desktop processors. There is another cutback compared to the desktop: there is only 1MB of L3 cache per core rather than 2MB, giving a total of 4MB of L3 cache. AMD’s Zen cores use L3 victim caches, which for most CPU-based workloads have little effect; however the speed of this L3 will be important when it comes to using the integrated graphics.

The single silicon design has 11 Vega compute units onboard, of which the Ryzen 7 2700U will be able to use 10 of them, and the Ryzen 5 2500U will be able to use 8. These will be called ‘Vega 10’ and ‘Vega 8’ graphics respectively. AMD does not provide the base frequencies for the graphics, but does state that the maximum frequencies for the parts will be 1300 MHz and 1100 MHz respectively. One of AMD’s key discussion points in our briefings was around the ability to shift power between the CPU and the GPU to keep the maximum performance at all times.

Memory support for both processors is up to dual-channel DDR4-2400; although AMD stated that it will be up to the laptop OEMs to decide whether to sell the devices with two memory modules. Some of the feedback the OEMs get is the requirement to ‘potentially’ upgrade the memory inside at a later date, which necessitates shipping single channel devices and leaving a memory slot free, rather than replacing two memory modules at once. The new Ryzen Mobile processors use AMD’s Infinity Fabric interconnect between the CPU and GPU segments, which runs at half the clock rate of the memory, and AMD states it offers better bandwidth and lower latency than PCIe.

Ryzen Mobile-based Laptops Coming to Shelves

When we get the final press releases in hand there will be specific news stories for each of the laptops coming to market, but AMD shared some information ahead of time about how AMD is returning to thin and light notebooks that actually have a proper design ID. As we stated back in our analysis of the Carrizo platform, there were plenty of users who were interested in AMD APUs but in an Envy or a Swift-like chassis, rather than the bulky plastic reduced price parts that vendors were putting out instead. So the big plus here is that we get an HP Envy x360, an Acer Swift 3, and a Lenovo Ideapad 720S with Ryzen Mobile.

Read our news post on the HP Envy X360 with Ryzen Mobile here

The HP Envy is actually the biggest notebook of the three, offering a 15.6-inch 1080p IPS screen and dual-channel DDR4-2400, with a 55.8 Wh battery. Storage will be offered with SSDs up to 512 GB and HDDs up to 1TB, although we are waiting to know if that SSD storage is SATA or PCIe. At just under 5 lbs it is going to be a bit heavy, but the x360 part of the name means it has a rotating hinge, allowing for it to be used as a tablet or a tent, with a touchscreen as well. Power is provided over USB Type-C, which also supports the DisplayPort alt-mode. Pricing will start at $699 and it will be shipping from November.

The Lenovo system is the smaller one, coming in at 2.5 lbs, and offering either a 1080p IPS screen or a 4K (UHD) IPS screen. We were told that this design uses a repurposed chassis from an Intel version, but will be offered with both the Ryzen 7 2700U and the Ryzen 5 2500U processors. As with most popular notebooks, the Ideapad 720S will taper to a point at the edge, but at its thickest point it will be around half-an-inch – it has been a while since we saw an AMD notebook at that size. Lenovo will support a 48 Wh battery and Type-C charging with a DisplayPort alt-mode, with storage up to 1TB of SSD (again, no mention of SATA or PCIe). The downside is perhaps the memory support, at DDR4-2133 and only single channel with no room to upgrade to dual channel. Ultimately Lenovo is going to promote this for productivity that is not memory bandwidth limited over gaming.

The Swift 3 is a little different than the others – we were told that Acer has built this chassis to dissipate 25W of processor power rather than 15W, meaning that Acer is going to be taking advantage of longer turbo modes and better performance numbers than other Ryzen Mobile parts. It will come with a 15-inch 1080p display, although it will not be offered in touch screen, and storage will be up to 256GB of SSD (again, no mention of SATA or PCIe). Memory will be dual channel, although the system will only support 8GB of DDR4-2133, and there is no mention of potential upgradability there – we’ll wait for the final press release.

What Is New with Ryzen Mobile

Aside from the on sheet specifications and upcoming devices that will be using these parts, AMD also provided some performance metrics, some updates to the SenseMI technologies for Ryzen Mobile, as well as a look into the new power regulation system developed for these parts, a lot of which are upgrades to the basic AMD Zen design that will be featured in the next generation of desktop processors. We will cover these in the next few pages.

AMD Goes For Performance
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  • jjj - Thursday, October 26, 2017 - link

    It's on 14nm,the actual silicon is maybe 15$ and then there is test and packaging.The cost of the die is not much of an issue.They can easily price the average SKU between 80-100$ with the fastest SKUs a bit above and the lesser SKUs bellow. Not that Intel has much different pricing, the prices they list have nothing to do with reality,.
  • wumpus - Thursday, October 26, 2017 - link

    While it likely costs the same to make as a R3 Ryzen (closer to an R7, because all CPU cores have to work), it will take a long time to dig themselves out of their hole by pricing it at $80-100.

    Don't forget they have to pay for the mask with "ryzen mobile" sales, while ryzen and epyc paid for Zepplin die tooling. I don't expect it to be a cheap chip unless AMD is absolutely forced to (like they have been forced to for years and are hungry for Intel level margins).
  • velanapontinha - Thursday, October 26, 2017 - link

    A very small difference between both processors, yet one is Ryzen 5 and the other is Ryzen 7. I really hope these are the lowest R7 and the highest R5.
  • zodiacfml - Friday, October 27, 2017 - link

    Appears to me that these are the best parts already. I can get by with a mobile R3 without hyperthreading.
  • stanleyipkiss - Thursday, October 26, 2017 - link

    A 14" Acer Swift 3 with the Kaby Lake-R (4 core/8 thread) 8 GB RAM and a MX150 from nVidia gets better FPS in every game outlined by AMD here. Why go for this? It's not lighter, it's not more efficient, it's not faster.

    In the real world, GPU performance is sub-par a 1030 (MX150). The only upside is the fact that you don't have to deal with Intel's iGPU and nVidia's discrete GPU in the same package. Other than that... not worth the hassle.
  • BrokenCrayons - Thursday, October 26, 2017 - link

    There appears to be a power advantage over a KB + MX150 since the combined consumption of the CPU and dGPU are higher than mobile Ryzen alone. All things equal, you're going to give up some GPU performance in exchange for more battery life. It's a trade-off some people will be willing to make and others will reject. Cool either way, just buy what works best for you and don't worry about it.

    With that said, I think Vega would do better with dedicated video memory of some sort which is why I would have liked to see these chips released with a small HBM cache that can be used to supplement the system's DDR4, but that's probably an unrealistic pipe dream for the time being. The added costs of associated would make mobile Ryzen more expensive...maybe more than a CPU + dGPU combination capable of the same performance.
  • Jon Tseng - Thursday, October 26, 2017 - link

    Anyone got any hard numbs on how this compares to KBL + MX150? I saw some commentary that Ryzen Mobile was comparable to the 950M... IIRC MX150 was a perf bump on the old 940MX. So are they on a similar level or does MX150 have a material advantage?

    Was thinking that if they are in the same zip code perf wise then Ryzen is a no brainer given power draw..
  • stanleyipkiss - Thursday, October 26, 2017 - link

    The MX150 is on par if not better than the old 960M. It's a huge step up from all iGPUs.
  • BrokenCrayons - Thursday, October 26, 2017 - link

    The 960M is consistently faster in synthetics (by a small margin) and in gaming benchmarks (by a much larger margin) than the MX150. Here's a couple of notebookcheck links to compare:
  • vladx - Thursday, October 26, 2017 - link

    Indeed GPU performance is vey dissapointing, but par for the course for Vega.

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