Intel "Medfield" Details Leak -- Powerful, But a "Battery Guzzler"
December 28, 2011 11:28 PM
comment(s) - last by
This might be a good chip for tablets, but not so much for smartphones
Numbers have reportedly leaked via
on the performance of CPU kingpin Intel Corp.'s (
, the company's
tardy upcoming ultra-mobile CPU
. Now it's important to exercise a bit of caution as the credibility of these figures is questionable and even if they're the real deal,
is still reportedly a half-year or more away from launch.
With that said, let's dig into them.
I. The Platform
First, let's look at the leaked specs for the tablet platform:
32 nm process
1GB of DDR2 RAM
GPU (no details given)
Noticeably absent from the leaked materials was any reference to a baked-in 4G LTE (or 3G GSM/CDMA) modem. Also absent was the very important CPU core count figure (based on the performance, this appears to be a dual-core chip).
The leak appears to consist of a benchmarked
is the name of the Android 3.2 Honeycomb tablet reference design, which Intel previewed in September. Given past information, it appears likely that
does have a 3G modem onboard, though whether it's on-die remains to be seen.
Intel's Red Ridge platform will be the first target for
, after Intel scrapped plans for a smartphone platform. [Image Source: The Verge (left); VR-Zone (right)]
II. A Powerful Little Piece of Silicon
Now the good news --
appears to be pretty fast. To give a point of comparison, let's look at top ARM chipmakers' current bread-and-butter smartphone chips, NVIDIA Corp.'s (
) Tegra 2, Qualcomm Inc.'s (
) MSM8260 third-generation Snapdragon, and Samsung Electronics Comp., Ltd.'s (
) Exynos were benchmarked (
's report made it unclear whether these benchmarks were performed by the blog or by Intel) and gave:
is a fast little bugger, capable of beating up on the current generation ARM smartphone chips. But the numbers are a bit deceptive as
is more of a tablet chip (more on that in a bit), so it
have gone up
against Tegra 3
, but for some reason the testers instead put it up against Tegra 2. As they did not give the Samsung platform tested, it's very possible they pulled a similar shenanigan with Samsung's chip, testing the lower clocked smartphone variant, versus the higher clocked tablet variant.
That said, the numbers do indicate unquestionably that
is going to be in the ballpark of ARM in terms of processing power, possibly even beating the ARM chips.
: Battery-Guzzler Edition
Now the bad news: the power budget is quite high. The platform reportedly has a 2.6W TDP at idle and a maximum power consumption of 3.6W when playing 720P Flash video. By launch the maximum power is intended to drop to 2.6W, while the idle is also likely to drop a fair bit.
Still, these numbers are pretty horrible if Intel hopes to squeeze
on a smartphone. Some quick "napkin math":
An average smartphone battery is around 1600 mAh
The output voltage is typically 3.7 V
The total battery power is thus 5.92 Wh
Thus the platform would last a bit over two hours at idle in a smartphone before dying
Intel's new chip could only muster about two hours of battery life in a smartphone.
[Image Source: Namran blog]
In other words there's no way Intel can hope to launch this chip in a smartphone.
It's disappointing to see Intel is still trailing so badly in power. For example, a loaded Tegra 2 reportedly draws around 1 W, meaning that it could sip the aforementioned battery for around 6 hours before kicking the bucket. Intel's chip is fast, but it appears to be a "battery-guzzler".
More troubling is the fact that these results come from a 32 nm part, where as NVIDIA and Qualcomm have 40 nm parts (Samsung is also at the 32 nm node). In other words, that process advantage Intel is always talking about appears to be nonexistent here.
Intel's best hope power-wise is its
3D FinFET technology
, which wil be introduced to
sometime in the 2013-2014 window
. That will likely be the true test of Intel's fading hopes in the mobile space. If Intel's 22 nm finFET transistor chip can't meet or beat ARM in power budget, it's game over.
IV. Launching Soon in a Tablet Near You
Lastly let's examine what else is known about
Intel reportedly hopes to launch the chip in "early 2012". As laid out here, it seems obvious that this is a tablet-only launch.
The launch is being spearheaded by Intel's new "Mobile and Communications" business unit. Intel has merged four separate units -- Mobile Communications, Mobile Wireless, Netbook & Tablet PC, and Ultra-Mobility -- to form the new super-unit.
The unit is headed by Mike Bell and Hermann Eul. Mr. Bell has a particularly interesting history. He was at Apple, Inc. (
) and helped design the first iPhone. From there he jumped ship to Palm. And when Palm was in its final throes pre-acquisition, he jumped ship in 2010 to Intel. So it's fair to say he has a bit of mobile experience.
was originally intended to be a smartphone platform. Instead -- likely due to poor power performance -- it has morphed into a third leg in Intel's tablet push. Intel already has
-- a beefier platform with PCI support, designed for Windows 7 tablets -- and
a lighter platform ideal for Android tablets. Presumably
will take the role of a leaner
, or perhaps step in as a
It has a tough road ahead as Intel has thus far had almost no traction in the ARM-dominated tablet market. The problems in the tablet department are familiar -- Intel's tablets tend to be powerful, but
have poor battery life and run hot
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RE: Dead before it comes out...
12/29/2011 3:45:54 PM
You do know that all these issues have already been resolved, right?
A15 brings an extended memory model called LPAE, which behaves somewhat like PAE though, as I understand it, the reason for it is very different.
PAE was about allowing many apps (each using less than 4GB) to utilize the memory of a system with more than 4GB. This is a model that makes sense for servers, but not for phones where few apps (especially really large apps) run at once.
So LPAE is more about providing a clean way for co-processors (like GPU) to share memory with the CPU. (ARM don't say this, but I would not be surprised if another reason for LPAE is to allow flash storage to be brought "directly" into the memory hierarchy, the way IBM AS/400 works. I could see Apple working towards this.)
Meanwhile A64, the Arm64 bit extensions have also been defined, including the new registers and memory model.
RE: Dead before it comes out...
12/30/2011 1:50:22 AM
I love all this talk about x86 is so awesome because of 15+ years of backwards compatibility.
Anything designed to run on x86 thats more than even a FEW YEARS OLD will run at full speed through emulation. Apple bet on that when they moved from PPC to x86 and it worked perfectly. And who can forget about DOSBOX?
The reality is any modern operating system (for tablet or phone) isn't going to run x86 programs just because it has an x86 processor, because the operating system (unless its Windows 8) isn't going to be compatible with the executables (Android on x86 obviously can't run Windows programs.)
Intel is literally pushing a bloated tank uphill by sticking with x86 on mobile platforms.
x86 command set has been stacked on like a Sega console: you can add a Genesis, Sega CD, and 32x; in the end you still have the same old-school core system using more and more electricity.
RE: Dead before it comes out...
12/30/2011 7:18:04 AM
Im sorry i dont get all this talk about 15 year backwards compatibility with ancient x86 games and software...
The smartphone and tablet market..which lets face it is what we are talking about here, the MAJORITY of people running arm version windows or google equivalent arnt going to worry about that,
Besides very quickly the most important x86 apps that would benefit being on a tablet/smartphone will be re-writen for arm..problem solved.
Of course there will be a small niche of people that will benefit from all the old apps..in that case they will have to do with a full laptop/pc variant.
I get the feeling however that not a whole lot of them apps will be optimised for a screen/touch input method and so wont be used, instead developers will just release a more up to date touch friendly version on arm for the masses.
Qualcomm krait/cortex a-15 have extensions enabling 40 bit memory addressing i think that what you were saying above...
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