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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12/29/2011 4:30:07 PM
Those Phoronix benchmarks are actually mildly surprising - I would have expected the OMAP4660 to be closer than that. I'm also quite impressed with their selection of processors for comparison (N270 is original single-core atom at 1.6 GHz, Z530 is a more recent single-core atom also at 1.6 GHz, the Pentium M 1.86 GHz is a single-core dothan, and the T2400 is a 1.86 GHz dual core yonah.) The inclusion of the dothan and yonah not only provide comparison against the original core micro architecture, but also show what kind of gains a specific benchmark realizes from multi-threading.
Now looking through the various benchmarks yields a few interesting points. First, for single-threaded performance the OMAP4660 is, at best, as fast as atom once the frequency difference is taken into account. Meanwhile the worst case has it lagging by quite a bit even with the result scaled for frequency. Second, the multi-threaded performance of the OMAP4660 is simply abysmal - there's only one multi-threaded benchmark where the dual core A9 beats a single core atom with hyperthreading.
12/29/2011 5:13:16 PM
Yea but the atom is higher clocked and with hyper threading, which intel puts up against arm duel core offerings...put it this way atom will not match arm in core count..the power consumpion would turn your tablet into a blow heater!.
Also they are at much higher tdps, and i think at much bigger die sizes even taking into account the die shrink to 32nm.
IMHO the duel core cortex a9 is comparable to an atom with HT clock for clock...but the a9 is at a fraction of the power..so can scale to much higher frequencies, and also much smaller die size.
28nm krait will completley smoke any atom,in any benchmark comparison and it will be launched in smartphones, with intergrated LTE on die with in 2 months.
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