All the recent talk of Haswell-E and high-end refreshes has obscured the more casual computing market. The Bay Trail platform uses Intel’s Atom based Silvermont cores and competes directly against AMD’s Kabini for integrated computing, digital signage and cheap computing models. Today we compare two mini-ITX Celeron J1900 based motherboards: the GIGABYTE J1900N-D3V at $85 and the ASUS J1900I-C at $92, as well as the SoC itself.

Bay Trail-D Overview

Intel’s Atom Silvermont based architecture covers four SoC areas:

 - Smartphones, in the form of Merrifield and Moorefield
 - Tablets, Notebooks and Embedded in the form of Bay Trail
 - Microservers and Storage in the form of Avoton
 - Network and Communications in the form of Rangeley

We tested the C2750 eight-core Avoton SoC in the ASRock C2750D4I, a system oriented around maximum DRAM and storage in a mini-ITX form factor, and reported on GIGABYTE’s 46x C2750 Avoton server back at Computex 2014. The microserver market is apparently ripe for Avoton, but Bay Trail makes the desktop and tablet spaces a little more confusing.

Bay Trail comes in four forms:

 - Bay Trail-D, for Desktop Systems at 6W to 20W
 - Bay Trail-I, for Embedded and Automotive at 5W to 10W
 - Bay Trail-M, for Mobile and Netbooks at 4W to 7.5W
 - Bay Trail-T, for Tablets and Hybrids at 2W

We have covered Bay Trail in Mobile and Tablets, such as the ASUS Transformer Book T100 that has the Atom Z3740 Bay Trail-T, but the casual desktop space is still an interesting market. ECS’ LIVA is a perfect example of this: Ganesh’s review of the LIVA with the 4.5W Celeron N2806 Bay Trail-M shows that with enough innovation, some interesting designs can be produced.

Today’s review focuses on the Celeron J1900, a quad core 10W Bay Trail-D with Intel Ivy Bridge HD Graphics (6 EUs). The CPU has a base frequency of 2.0 GHz with a 2.42 GHz Turbo mode, 2 MB of L2 cache and support for dual channel DDR3L-1333. The J1900 was one of the targets of AMD’s AM1 Kabini launch earlier in the year, where the two traded blows on functionality:

AMD Athlon 5350 vs. Intel Celeron J1900
  Athlon 5350 Celeron J1900
CPU Architecture Jaguar Silvermont
CPU Cores 4 4
CPU Frequency 2.05 GHz 2.0 GHz / 2.4 GHz Turbo
GPU Cores 128 SPs 6 EUs
GPU Frequency 600 MHz 688 MHz
Memory Channels Single Dual
Memory Frequency 1600 MHz 1333 MHz
L2 Cache 2 MB 2 MB
TDP 25 W 10 W
Price $59 $82

AMD’s main power point for Kabini was the upgradable platform, due to Intel’s Bay Trail involving soldered on CPUs. Memory compatibility is traded, with Intel supporting dual channel but at a lower frequency. Price is also a battleground, along with GPU cores, although Intel uses significantly less power (on paper).

Because Bay Trail-D is a BGA processor, this means that the processor and motherboard must be purchased in tandem. There are a number of Bay Trail-D combinations available for purchase:

$200 – Jetway JNF9M-2930 (Celeron N2930, Bay Trail-M)
$150 – Habey MITX-6771 (Celeron J1900, Bay Trail-D)
$118 – ASRock Q1900TM-ITX (J1900)
$99 – ASRock Q1900DC-ITX  (J1900)
$85 – GIGABYTE J1900N-D3V (J1900)
$80 – ASUS J1800I-A (Celeron J1800, Bay Trail-D)
$79 – ASUS J1800I-C (J1800)
$76 – ASRock Q1900-ITX (J1900)
$75 – Foxconn D190S (J1900)
$70 – ASRock Q1900M (J1900)
$70 – ASRock Q1900B-ITX (J1900)
$63 – Biostar J1800NP (J1800)
$60 – ASRock D1800M (J1800)
$60 – ASRock D1800B-ITX (J1800)
$60 – ASUS J1800I-C (J1800)

Thus for this review, we chose two of what might be the most popular Bay Trail-D motherboards for home builds: two mini-ITX systems, the GIGABYTE J1900N-D3V and the ASUS J1900I-C. Both of these use the Celeron J1900 processor, whereby the J1900 sits in the middle of Intel’s Bay Trail-D offerings but is the top SKU with the Celeron nomenclature:

Bay Trail-D Comparison
  Cores CPU
Celeron J1750 2 2410 10W 1 MB HD (Ivy) 688 / 750  
Celeron J1800 2 2410 / 2580 10W 1 MB HD (Ivy) 688 / 792 $72
Celeron J1850 4 2000 10W 2 MB HD (Ivy) 688 / 792  
Celeron J1900 4 2000 / 2420 10W 2 MB HD (Ivy) 688 / 854 $82
Pentium J2850 4 2410 10W 2 MB HD (Ivy) 688 / 792  
Pentium J2900 4 2410 / 2670 10W 2 MB HD (Ivy) 688 / 896 $94
C2550 (Avoton) 4 2400 / 2600 14W 2 MB None N/A $86
C2750 (Avoton) 8 2400 / 2600 20W 4 MB None N/A $171

Four Silvermont cores at 2 GHz for 10W sounds impressive, especially when I think back a decade to what I had back at university, or the 35W Core 2 Mobile CPU I had in my last laptop. As we found with the C2750, single thread speed should be reasonable and while multithreaded applications can take advantage, it doesn’t replace an i3, but ultimately that is not the intended market. Both the GIGABYTE J1900N-D3V and ASUS J1900I-C are going for that base desktop market, where ‘some memory’ and ‘some storage’ are needed, such as digital signage, a basic HTPC or run-of-the-mill all-access government machines.

It is worth noting that for Bay-Trail D, there are two steppings of the processors:

The new C0 stepping allows Intel Quick Sync to be used, but aside from the change in stepping (B3 to C0) there is no other outward indication which version is going to be used unless you are a customer that deals with Intel directly. Even though our samples in this review were new, both contained the B3 stepping version of the SoC.

Nevertheless, some of the Bay Trail-D SKUs to come with a form of Intel Burst, allowing parts of the SoC to turbo depending on how power is needed:

The Bay Trail Chipset

Similar with AM1, the integration of the IO into the SoC means there is no formal south bridge to distribute the ports and all routing is via the SoC:

Here the System Agent negotiates data between the dual channel DDR3L memory controllers, the Silvermont dual core ‘modules’ and the graphics, supplied as 6 EUs based on the Ivy Bridge video architecture. Because the Bay Trail SoC supports far fewer I/O connections compared to our usual foray into consumer based motherboard/CPU combinations, a mini-ITX is enough to almost fit them all.

The full block diagram for the J1900N-D3V is:

The SoC allows four PCIe 2.0 lanes from the chipset, which the manufacturer can use network connections or other IO controllers for. Here GIGABYTE has used two for Realtek NICs, one for a PCIe to PCI bridge and a mini-PCIe for a WiFi card or similar. The SoC supports two SATA 3 Gbps and a single USB 3.0 port, with this GIGABYTE motherbaord using a Renesas hub on that USB 3.0 to expand the offering to four.

Here is where Bay Trail comes across an issue. The system is designed to be cheap and competing with Kabini, meaning that motherboard manufacturers cannot fill the product up with controllers that cost a lot. It would be interesting if the PCIe lanes were used for additional SATA controllers, allowing for a large storage system, but that ends up being exactly what the C2750D4I is. Also, the decision here on the GIGABYTE to use a PCI slot will be for legacy use, as the latest graphics card available that uses PCI would be a HD 5450 or GT610/430.

Legacy connectors are always a touchy subject. Some motherboard reviews on products with a PS/2 or PCI slot might end up with a comment wondering why they still exist. The answer lies in industry, because upgrading that $1,000 PC is cheaper than upgrading the $5,000,000 bit of 15-year old equipment it is connected to. Bay Trail-D, even though is offered to the public, has a use in these motherboards for industry, so GIGABYTE and ASUS have to cover the bases. There are a few key points to consider in this respect:

 - Does it have the right connectors?
 - Does it cost a lot?
 - Is it easy to set up?
 - Is it responsive enough?
 - Will it compute as much as is needed in a reasonable time?

The last two points end up being the usual reason for upgrading. For example, back in the lab I worked in several years ago our vintage equipment (an older version of this) ran on Pentium 4 machines but required a legacy slot for the proprietary communication and control card it ran on. In order to upgrade, it had to meet the above criteria. This is why legacy still exists.

Back to the review: we are putting both the GIGABYTE J1900N-D3V and the ASUS J1900I-C through their paces for usability as well as the J1900 SoC for responsiveness. These boards are in the $85-$95 mark, providing a competitive price point against AMD’s Kabini. Motherboards at the cheaper end of the spectrum tend to be worked on by less people, purely because the profit margins are low. Both the motherboards in this review are dealing with the fact that they have to include the SoC on the motherboard at the point of sale. Intel lists the price of the J1900 as $82, meaning that these SoCs are actually sold at a discount or in a discounted-revenue strategy, or the motherboard manufacturers are getting them severely discounted in order to make cents per sale.

GIGABYTE J1900N-D3V Visual Inspection, Features
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  • Antronman - Friday, October 17, 2014 - link

    I'd much rather be using a Kabini for some mainstream browsing and multimedia.
  • speculatrix - Friday, October 17, 2014 - link

    the first UEFI firmware on the Gigabyte motherboard was just awful, the followup F2 was slightly better, but to make it useable you need the F3 version. Updating can be a problem, I started a discussion about it here:

    there was a big discussion about baytrail motherboards on the silentpcreview forums, here:
  • rstuart - Saturday, October 18, 2014 - link

    "Load Delta Power Consumption" is just jargon - and you don't define it. Googling it return just one page of hits. If they are any indication, it total draw from the wall.

    But even that figure is meaningless unless you tell us what conditions the test was done under. Eg, was the test setup identical for all systems tested, not just the motherboards in question. What power supply was used? What does load was the system put under?

    Also, a comparison of the system at idle versus under load would be interesting. Most of the time my systems are idle.
  • Bonesdad - Saturday, October 18, 2014 - link

    White titled on a white background...
  • valkyrie743 - Sunday, October 19, 2014 - link

    the ASUS J1900I-C looks like nice for a simple XBMC box.
  • Mvoigt - Sunday, October 19, 2014 - link

    Just slap an Zotac geforce 610 PCI 1gb ddr3 in the pci slot and you got and decent machine for sligthly older games.... :) even never ones at low res....
  • evident - Sunday, October 19, 2014 - link

    I would have loved to see J2900 numbers in this article as well to represent the top end of these bay trails. I still don't care what anyone says, I still don't feel this is a viable platform for granny's daily web surfing and farmville activities, let alone a HTPC. you just cant justify miserable performance when you can step up to a sandy bridge celeron for way better performance.

    if you look at real world pricing for J1900 based machines, the only winners are the pc box manufacturers charging $200-300 for this garbage. you can easily pick up a haswell pentium or last generation ivy bridge pentium for that price if you wait for a clearance.
  • abufrejoval - Tuesday, October 21, 2014 - link

    I'd love to see those, too. Even more I'd like to be able to actually purchase J2900 hardware, but I have yet to see any.
  • dealcorn - Monday, October 20, 2014 - link

    Several posters have suggested that Kabini may be more attractive than Silvermont. In the real world where companies report revenues quarterly, Baytrail-D and Baytrail-M took significant market share from AMD during the second quarter of 2014. The trend accelerated as Atom claimed increased market share during the third quarter and I believe Dr. Su projects this share loss trend will continue in the fourth quarter. The reasons this occurred are not discussed in the Article but are sort of obvious if you look at real word pricing and real word consumer preferences.

    Today, Newegg will sell you a AMD’s Kabini 5350 for $65 and a BIOSTAR AM1MHP motherboard with Gb Ethernet for $32 making the 5350 a $97 platform. Alternately, you could buy a ASRock Q1900M with a single Gb Ethernet connection for $70. The real world 5350 platform costs $27 (38%) more. I would argue that ASRock is a preferred brand name over Biostar and perceived brand quality does matter at the low end. Obviously, the 5350 has better graphics for gaming but the J1900 supports 1080p video or better in all major codecs. Because the J1900 is significantly cheaper and has fully adequate graphics for everyone but gamers, sales of the 5350 are limited to cheap dedicated gamers and the 5350 dominates the cheap dedicated gamers segment. Problem is, gamers tend not to be that cheap. For a few dollars more than $97 you can step up to a super gimped Intel big core solution with discrete graphics card and far greater game potential than the 5350 solution. In the real world, it does not help to dominate a market niche with trivial sales volume and the quarterly earning releases of AMD and Intel powerfully make this point.

    As a side note, the J1900 motherboards tested in the Article feature dual NIC's and that is an expensive feature in this price class. By way of contrast, Newegg sells no AM1 motherboards with dual NIC's. Because J1900 is very efficient, some folks leave them powered on 24/7 so they can act as a passively cooled firewall/router download station. Finally, Intel does not use contra-revenue with either Baytrail-D or Baytrail-M, These are full margin products. Anyone who asserts otherwise just got hit kinda hard with the stupid stick.
  • silverblue - Monday, October 20, 2014 - link

    I can buy a 5350 for about £40 and a Biostar AM1ML board for £20. An MSI J1900I costs a little under £60, so you can get into both for about the same price. I suppose it depends on features in the end.

    As it is, AMD should cut at least £5 off the RRP.

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