Intel has added three new microprocessors for embedded and highly-integrated applications into its lineup. The new CPUs are based on the Skylake microarchitecture and feature high-performance integrated graphics cores with an added eDRAM cache called Crystal Well. The new products should offer high performance in memory bandwidth applications due to Skylake’s updated 2nd generation cache architecture.


In red is the 4+4e die with 128MB eDRAM

The chips that Intel has added to its price list are the Core i7-6785R, the Core i5-6685R, and the Core i5-6585R. The new processors are designed to fit in all-in-one PCs, small form-factor and other types of highly-integrated PCs that can satisfy the 65W TDP over the mobile Crystal Well variants that run at 45W. The new desktop chips from Intel are based on the Skylake-H silicon in its most advanced configuration: with four general-purpose cores as well as the GT4e integrated graphics. Not all the specifications of the processors are known at this point, but we are talking about quad-core processors with Generation 9 Iris Pro graphics and 72 execution units (as well as 128 MB of eDRAM), a dual-channel DDR4-2133 memory controller, a PCI Express 3.0 interface and three display outputs. The power consumption of Intel’s new embedded products for desktops does not exceed 65 W, which is typical for R-series offerings, and offer a potential upgrade path by OEMs for any equivalent systems that used an equivalent Broadwell-based R-series processor.

Intel unveiled its Skylake-H silicon in its full glory earlier this year when it released its mobile Xeon E3 v5 processors with the Iris Pro Graphics P580

Several makers of industrial computer modules (such as Congatec) already use chips like the Intel Xeon E3-1515M v5 for their products, which is why we know what they look like. The die of the Skylake-H processor looks rather long and the lion’s portion of its transistor budget was spent on the mammoth iGPU. The extra on package die is the eDRAM, and the silicon underneath the CPU is the chipset (it's the Y/U series CPUs that have integrated chipsets).

Comparison of Intel's Embedded CPUs
  i7-6785R i5-6685R i5-6585R i7-5775R i5-5675R i5-5575R
Microarchitecture Skylake Broadwell
Cores/Threads 4 / 8 4 / 4 4 / 4 4 / 8 4 / 4 4 / 4
L2 Cache 1 MB (256 KB × 4)
L3 Cache  8 MB 6 MB 6 MB 4 MB
eDRAM 128 MB 128 MB
CPU Frequency default 3.30 GHz 3.20 GHz 2.80 GHz 3.30 GHz 3.10 GHz 2.80 GHz
maximum 3.90 GHz 3.80 GHz 3.60 GHz 3.80 GHz 3.60 GHz 3.30 GHz
GPU Iris Pro 580 Iris Pro 6200
EUs 72 48
TDP 65 W 65 W
GPU Frequency 350 MHz to 1150/1150/1100 MHz 300 MHz to 1150/1100/1050 MHz
DRAM Support DDR4-2133/1866
DDR3L-1600/1333
-
DDR3L-1866/1600/1333
Packaging FCBGA1440 FCBGA1364
Process Technology 14 nm
Price $370 $288 $255 $348 $265 $244

The new parts feature higher clock rates compared to the Broadwell processors, although slightly lower than their K series counterparts. The processors have a number of important architectural improvements which will affect the performance of these CPUs in real-world applications. It is interesting to note that Intel retained the full L3 cache size in its new R-series CPUs: in the Broadwell models part of the L3 was used for eDRAM tags, reducing their capacity by 2 MB, but the new Skylake parts are now in line with their i7 and i5 naming due to the way the eDRAM is implemented. This means that the i7-6785R has 8 MB of L3, similar to the i7-6700K, and the i5-6685R/6585R has 6 MB of L3, similar to the i5-6600K.

Intel’s Skylake processors feature an upgraded microarchitecture with better parallelism and improved IPC, which means better performance almost across-the-board. An important capability of Skylake is its Speed Shift technology, which can quickly increase frequency for a short amount of time in a bid to rapidly perform an operation (~1-3 milliseconds rather than 30-100 without Speed Shift), thus providing better user experience and ultimately saving power. Intel’s Speed Shift requires support by the operating system and right now Microsoft’s Windows 10 can take advantage of the technology in a bid to improve its responsiveness. 

Another important aspect of Intel’s Skylake CPUs with high-end iGPUs is their eDRAM, which means the processors also gain the code name 'Crystal Well'. The eDRAM for Skylake is different to that found in previous Crystal Well implementations: in the last generation, the eDRAM acted as a victim cache to the L3 cache, meaning that evicted cache lines from L3 would add up in the eDRAM and be quick for re-reading without having to access main memory. The downside to this is that data could not end up in eDRAM without being used first, giving initial data read latencies the same performance as previous processors. Ultimately this is still good for graphics and gaming, where textures are re-read from memory frequently. The new arrangement for the eDRAM in these Skylake processors has placed the eDRAM in a different part of the chain, between the System Agent and the DDR memory. This means that the eDRAM acts as a DRAM buffer, with 50 GBps bandwidth in each direction to the LLC, but is also accessible for early reads/writes by any device that needs memory access through the system agent (i.e. anything through PCIe). Previously this was not possible, but now it means that Skylake's eDRAM implementation should offer a speedup in many more scenarios that before. 

The final noteworthy improvement of the Skylake processors compared to previous-generation offerings is revamped graphics core as well as increased amount of execution units. Based on our findings last year, real-world performance of Intel's high-end Iris Pro 6200 graphics core (Broadwell’s top iGPU) is higher than that of entry-level discrete graphics cards. Meanwhile, the highest-performing GT4e graphics core of Intel Skylake contains 72 EUs, up from 48 in the case of the Broadwell. Compute performance of Intel's contemporary top-of-the-range iGPU (Iris Pro 580) is around 1.1 TFLOPS depending on its frequency, so, this one should be tangibly faster than its predecessor. Last, but not least, Skylake’s iGPU has a revamped multimedia engine, which supports hardware decoding and encoding of UHD videos using HEVC or VP9 codecs.

Intel’s new Core i7-6785R, Core i5-6685R, and Core i5-6585R are already available at a tray price of $370, $288 and $255 respectively. Partners of the chipmaker will likely use the new processors to build their new systems in the coming months.

Image Sources: Congatec, Intel's IDF presentations.

Source: Intel's Price List (via a reader)

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  • extide - Tuesday, May 3, 2016 - link

    Well... the 5775c came out right AFTER a new process, not right before (and it uses the new process..) It came out right before a new arch, though. Reply
  • Arnulf - Tuesday, May 3, 2016 - link

    About frikkin' time Intel! If this means I can finally get Radeon HD5770 level of performance without resorting to discrete GPU solution and cool my entire computer using a single high-quality cooler I'm definitely grabbing one (i5-6685R that is). No more annoying GPU fans ...

    Sorry AMD, your Raven Ridge (Zen-based) is taking too long.
    Reply
  • nunya112 - Tuesday, May 3, 2016 - link

    i still cant buy a broadwell cpu let alone one with Edram why cant they make 2 high end I5 and i7 with the Edram and let us have a cpu that really does give more than 5%. that is the only cpu in broadwell and skylake that give you tru next gen and about 12-15% improvement Reply
  • Mobile-Dom - Tuesday, May 3, 2016 - link

    It's a shame these arent LGA and socketed, because these would (arely) fit inside the thermal limit of the new MiniSTX form factor.

    a Hackintosh mini based on other of those would be nuts.
    Reply
  • nomad73 - Tuesday, May 3, 2016 - link

    The i7-6785R is the processor I would have loved to see in Intel's latest Skull Canyon NUC (with the understanding that a different cooling arrangement might have been required). It is even cheaper than the one used there. This processor could be the base for a small competent system. I hope somebody picks it up and builds a nice compact system around it. Reply
  • Sushisamurai - Wednesday, May 4, 2016 - link

    When are we going to get a review? Are these over clockable (because that would be awesome)? Reply
  • Sushisamurai - Wednesday, May 4, 2016 - link

    so these are not socketed/LGA are they... ... :( Reply
  • Meaker10 - Wednesday, May 4, 2016 - link

    Correct me if i'm wrong but much like the 4xxx series the big bit is the cache and the small bit is the CPU ;) Reply
  • Drazick - Wednesday, May 4, 2016 - link

    I wish Intel created High TDP socket CPU with the full Power of Iris Pro.
    Namely something like 6770K with this GPU.

    I'd even go farther, give us Skylake-E with this built in GPU and eDRAM.

    This will simplify a lot building a great computational system.
    Great workstation for MATLAB, Julya, Python, etc...
    Reply
  • alpha64 - Wednesday, May 4, 2016 - link

    Ian, would it be possible to do an investigative benchmark into "Speed Shift" on windows 10, and the support for HWP in the Linux kernel? It seems they are the same, but I would like to understand if Windows 10 has a real advantage over the Linux kernel support. According to https://events.linuxfoundation.org/sites/events/fi... on page 25, these two things are the same (and the PDF above is from Intel). HWP in the intel_pstate cpufreq driver has been around since 2014, and has continued to be updated since. In fact, Linux 4.6 will have it enabled by default if hardware supports it. Reply

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