The Desktop Kabini Review Part 1: AMD Athlon 5350 (AM1) Tested
by Ian Cutress on April 9, 2014 8:00 AM ESTAMD announced earlier in March that it would be launching a socketed desktop Kabini APU. Traditionally the ultra low end/low power SoCs on desktops have come in packages soldered on to motherboards. If you need a faster CPU, you bought a new motherboard with it. With its new AM1 platform, AMD hopes to bring the sort of flexibility enjoyed by the rest of the desktop market to the entry level value segment.
The rationale is simple: the traditional desktop PC is under tremendous price pressure due to the popularity of affordable tablets, notebooks, Chromebooks and Chromeboxes. While there are definitely advantages to a desktop, it's a market that won't grow on its own. The one advantage desktops have over any of the aforementioned modern mainstream computing devices is upgradability. Unfortunately that's a feature that's often lost as we look at the value segment of the desktop market. AM1 attempts to fix that.
A socketed APU is useless without a lineup of APUs to swap in and out of the aforementioned socket, and that's exactly what AMD is launching today. There are a total of four AM1 APUs launching today:
AMD AM1 Kabini APUs | ||||
Athlon 5350 |
Athlon 5150 |
Sempron 3850 |
Sempron 2650 |
|
CPU Cores | 4 | 4 | 4 | 2 |
CPU Frequency | 2.05 GHz | 1.60 GHz | 1.30 GHz | 1.45 GHz |
GPU Cores | 128 | 128 | 128 | 128 |
GPU Frequency | 600 MHz | 600 MHz | 450 MHz | 400 MHz |
Memory Frequency | 1600 MHz | 1600 MHz | 1600 MHz | 1333 MHz |
L2 Cache | 2 MB | 2 MB | 2 MB | 1 MB |
TDP | 25 W | 25 W | 25 W | 25 W |
Price | $55 | $45 | $36 | $31 |
Each of these APUs features up to four 28nm Jaguar cores and a 128 SP implementation of AMD's GCN GPU. We've gone over both the Jaguar and GCN architectures in previous articles, so we won't spend a lot of time recapping them here. Jaguar is the latest in AMD's line of "cat" cores, designed to go up against Intel's Atom. GCN on the other hand is a well known GPU design from AMD as well, cut down here to fit in a much smaller die area (and thermal envelope).
This isn't the first time we've seen this Jaguar + GCN combination of course. Kabini first launched as a notebook APU nearly a year ago. Architecturally we're looking at the very same SoC, even down to running at the same max clocks and at the same TDP. The big difference is what we have here today is socketed and targeted at the desktop.
The Athlon and Sempron brands are back and used for AM1 Kabini. The most expensive AM1 APU is the $55 Athlon 5350, a quad core SoC running at 2.05 GHz with a 2 compute unit GCN GPU (128 SP) running at 600 MHz. All four models will have an official TDP rating of 25W, suggesting that they are all the same die and merely binned according to performance.
While the APU costs are low, it's actually the motherboard costs that are most impressive. AMD expects mini-ITX and micro-ATX AM1 motherboards to retail for between $25 - $35. At the low end of the spectrum that means you could be looking at a fully integrated desktop platform for less than $60. Obviously you have to add in the cost of memory, storage, PSU/chassis and heatsink/fan but we're still dealing with an extremely low cost solution.
The real value in having a socketed processor is being able to upgrade the chip without incurring the cost of a new motherboard down the road. Unfortunately AMD isn't saying anything about what future APUs will support Socket-FS1b, so for now all we have is what's in the table above. Given the BGA compatibility between Kabini and Beema, I'd assume we might see a Beema FS1b upgrade at some point. However what comes after that remains to be seen.
Historically AMD has done a good job of maintaining backwards compatibility with sockets for as long as possible, the one challenge being shifts in memory technology. With DDR4 expected to ship at the high end later this year, the DDR3 based FS1b platform should at least have some life in it from a memory compatibility standpoint.
The Platform, Socket & Motherboards
While AM1 is the name of the platform, FS1b is the name of the new socket. AMD sent along a Gigabyte AM1 micro-ATX board (the GA-AM1M-S2H):
The AM1 platform makes for incredibly simple motherboards. There's hardly anything down on the board itself as Kabini is a full blown SoC with integrated memory, PCIe, USB, Gigabit Ethernet and SATA controllers. Gigabyte threw down an iTE Super I/O chip on the motherboard (beneath the heatsink in the lower left) to add serial, LPT, and PS/2 keyboard/mouse ports.
The key points to note here are:
- Single Channel 64-bit DDR3/DDR3L
- Two USB 3.0
- Eight USB 2.0
- PS/2
- Trusted Platform Module Support
- Up to four eDP/DP/HDMI video ouputs
- VGA output
- Four PCIe 2.0 lanes for a discrete GPU/PCIe device
- Two SATA 6 Gbps ports
- One PCIe 2.0 x1 lane allocated to an Ethernet controller
- Three PCIe 2.0 x1 lanes for other controllers (SATA, USB, LAN, WiFi, PCIe 2.0 x1 slots, PCIe to PCI bridges)
As you can see, Kabini provides a good amount of IO. The Gigabyte board includes a single PCIe x16 slot (x4 electrical) and two x1s. You also get two USB 3.0 ports and two USB 2.0 ports on the back header, although the APU itself can support up to 8 USB 2.0 ports. There are also two 6Gbps SATA ports down on the board, the maximum supported by Kabini.
The audio solution has to be cheap to be viable, and we get an ALC887 Realtek codec, which is actually higher end than I expected. Realtek are said to offer a discount when an audio codec and network controller are bought for the same product, so it is no surprise to see a Realtek NIC equipped here.
Because AM1 is a drive to low cost platforms, I do not see many motherboard manufacturers taking advantage and producing works of electrical engineering art. When the most expensive APU you can purchase for a platform is $55, when a motherboard manufacturer starts considering extra controllers or fancy features, the cost/benefit analysis might go out of the window. An extra USB 3.0 controller might add $0.75 to the bill-of-materials, require extra validation and optimization, then add a final $2.50 to the end-user cost (or $4 after retailer markup). After speaking with Patrick from ServeTheHome about the platform, there is certainly scope for adding several NICs to the motherboard and combining its use both as a PC and a router, however none of the motherboards being released with AM1 at launch seem to have more than one.
I was told by AMD that AM1 systems should support memory overclocking above the verified DDR3-1600 speed. This should allow the integrated graphics to stretch its legs a bit more despite the presence of a single channel memory controller should a system integrator consider buying faster memory. Unfortunately at least the Athlon 5350 seems locked to a max multiplier of 20.5x, so there's no hope for easy overclocking of this part at least.
On day one, motherboards should be available from the following vendors:
Once the products are in the market we will attempt to go over them all in one of our motherboard previews, and perhaps a few in full reviews.
With a new socket comes a new heatsink mounting system. Although the rest of AMD's desktop sockets still rely on a latch + lever retention system, Socket-FS1b moves to a push-pin design similar to what Intel uses on its motherboards (albeit with fewer mounting holes, and much simpler mounting/removing due to lower retention force requirements).
At 25W TDP, we might have been hoping for a passive solution, and I am sure that one of the CPU cooler manufacturers will make one, but AMD is playing it safe by using a small active low profile stock cooler. I would hazard a guess that this is an all aluminium construction in order to keep costs down. The reference AM1 HSF is oddly reminiscent of what old "high end" CPUs used to use years ago.
Most AM1 platform motherboards will be similar to what we have here. Some will ship with DisplayPort/DVI, and others might have an extra USB3/SATA controller. I doubt we will see any with audio codecs above the ALC892, or Killer NICs, although there might be an Atheros in the mix.
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Shivansps - Wednesday, April 9, 2014 - link
J1900 is quad, J1800 is dual.Anadtech did everything they could to make the 5350 look good, not incluiding Haswells is one giant red flag right there, the 5350 MUST be tested vs G1820 as well J1900 and AMD A4s, none of those tests where done to make the 5350 look good.
YuLeven - Wednesday, April 9, 2014 - link
But, but, but... but... G1820's power comsumption is a solid 25W more! Think of the dolphins and the trees! It must be rubbish!Communism - Wednesday, April 9, 2014 - link
The funny part is that the G1820's true TDP isn't anywhere near 55w.It's only listed as 55w TDP because Intel doesn't want to make selling their more expensive low power parts even harder :P.
Communism - Wednesday, April 9, 2014 - link
To put this in perspective, my 3570k supposedly has a TDP of 77w.It actually does about 70w for the CPU alone @ 4.4ghz running Intel Math Library Linpack (The highest heat output you're likely to ever see).
That was running just 5-10 degrees from TJmax as well, so superior cooling wasn't a large factor since the stock CPU w/ stock cooler @ stock speeds would be about that temperature as well.
jospoortvliet - Thursday, April 10, 2014 - link
Esp as it turns out that power usage compared to jaguar cores is barely a few percent lower and actually muc worse at idle. The final article will have to come back on this statement.riottime - Wednesday, April 9, 2014 - link
gosh. it's depressing looking at the stale fx line in that roadmap. :(FriendlyUser - Wednesday, April 9, 2014 - link
Great product! Ideal for an HTPC or NAS or even a casual desktop. It will be a hit in the weaker economies.Ranari - Wednesday, April 9, 2014 - link
It's a great product for the price, and that's all it needs to be: Quad core, a powerful and compute-capable GPU, and reasonably feature rich. The only thing that seems to be holding the Cat cores back are their clockspeeds.robbertbobbertson - Wednesday, April 9, 2014 - link
mini-PCIe slot cannot be used for cooking scrumptious bacon pancakesi am disappoint
QChronoD - Wednesday, April 9, 2014 - link
Just wanted to point out that the description of the IGP Gaming page says the tests are being done at 1080P and Xtreme settings, but it lists 1280x1024 on the graphs. Are they being done at the highest settings as well? I would imagine the test would be more useful if the settings were turned down to medium or low since that's what anyone with the system would actually be using.