Intel Dual-Core Mobile Ivy Bridge Launch and i5-3427U Ultrabook Reviewby Jarred Walton on May 31, 2012 12:01 AM EST
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- Ivy Bridge
Captain's Log, Stardate 20531.0: Dual-Core Ivy Bridge Spotted
After April’s launch of quad-core desktop and mobile Ivy Bridge parts, today Intel is launching the smaller, cheaper, and lower powered dual-core half of the IVB family...but only for mobile users. The i7 and i5 parts will be launching today, while budget-seekers looking for i3 parts will need to wait until Q3 to get their IVB fix. If you're looking for additional information on the desktop parts, we don't have much to discuss right now as those are also slated for Q3'12, but Anand does have a writeup of the i5-3470 with HD 2500 Graphics. As we've noted in the past, Intel continues to focus more and more on their mobile products, and dual-core Ivy Bridge continues that trend. Since Intel is really pushing their Ultrabooks for mobile users, we'll start there.
|ULV Mobile Ivy Bridge Processors|
|Base CPU Clock||2.0GHz||1.9GHz||1.8GHz||1.7GHz|
|Max SC Turbo||3.2GHz||3.0GHz||2.8GHz||2.6GHz|
|Max DC Turbo||3.0GHz||2.8GHz||2.6GHz||2.4GHz|
|L3 Cache (MB)||4MB||4MB||3MB||3MB|
|iGPU||HD 4000||HD 4000||HD 4000||HD 4000|
|GPU Clock (Base/Max)||350/1150MHz||350/1150MHz||350/1150MHz||350/1050MHz|
|Max Supported DDR3||DDR3-1600||DDR3-1600||DDR3-1600||DDR3-1600|
At the low end of the power scale and primed for use in Ultrabooks we have the Ultra Low Voltage (ULV) IVB family, which is composed of four chips—a pair of i7s and a pair of i5s, with one OEM model in each family. As is customary for the Core i-Series ULV parts, all of these chips have a 17W TDP and run at fairly conservative base clock speeds in order to keep their TDP in check. For the most part Intel is playing it straight here, with the primary differences between the chips being CPU and GPU clock speeds, L3 cache sizes, and of course price.
At the top of the lineup is the i7-3667U, which ships at a base clock speed of 2GHz and can turbo up by at least 50% to 3.0GHz with two cores active or 3.2GHz with one core active. Compared to its SNB predecessor this is 200MHz higher on the base clock and 400MHz/300MHz higher on the turbo clocks in the same 17W envelope, so in CPU-bound scenarios the i7-3667U should pack a noticeably bigger punch. That's in addition to minor performance enhancements with the Ivy Bridge microarchitecture, which should account for another ~5% performance increase at the same clock speed on average.
Of course with Ivy Bridge the biggest performance increases are on the GPU side. All of the ULV IVB CPUs ship with Intel’s HD 4000 iGPU, which brings with it a 33% increase in the number of EUs on top of support for DX11 and OpenCL. Compared to SNB the graphics clocks are largely unchanged—350MHz is still the GPU base clock speed while the turbo clock speed has been dropped from 1200MHz to 1150MHz—so the bulk of the performance improvements will be from the larger number of EUs, IVB’s ability to turbo more often, and of course the architectural improvements Intel has made for this generation.
Intel's prototype Ivy Bridge Ultrabook
Fleshing out the rest of the ULV lineup, we have the i7-3517U that runs at slightly lower clock speeds, and then the i5-3427U and i5-3317U. Along with still lower clock speeds, the i5 ULV CPUs also give up 1MB of L3 cache, leaving them with 3MB of L3. All of the ULV CPUs feature VT-x and AES-NI support, so Intel is leaving the most critical features available on the entire lineup, however business buyers will want to take note that the OEM-only parts—i7-3517U and i5-3317U—do not feature Intel’s Trusted Execution Technology (TXT) or vPro.
|Standard Voltage Mobile Ivy Bridge Processors|
|Base CPU Clock||2.9GHz||2.8GHz||2.6GHz||2.5GHz|
|Max SC Turbo||3.6GHz||3.5GHz||3.3GHz||3.1GHz|
|Max DC Turbo||3.4GHz||3.3GHz||3.1GHz||2.9GHz|
|L3 Cache (MB)||4MB||3MB||3MB||3MB|
|iGPU||HD 4000||HD 4000||HD 4000||HD 4000|
|GPU Clock (Base/Max)||650/1250MHz||650/1200MHz||650/1200MHz||650/1100MHz|
|Max Supported DDR3||DDR3-1600||DDR3-1600||DDR3-1600||DDR3-1600|
The other family of dual-core mobile IVB CPUs being launched today is the Standard Voltage (SV) lineup, which is composed of CPUs that operate at 35W. With the bulk of Intel’s i7 mobile IVB lineup focused on quad-core CPUs, there’s a single i7 here along with three i5s. The i7-3520M has a base clock speed of 2.9GHz and can turbo up to 3.4GHz and 3.6GHz with two and one active cores, respectively. Meanwhile the GPU base clock is 650Mhz and can turbo up to 1250MHz. Compared to the outgoing SNB based i7-2640M, this is only a 100MHz bump, so the CPU performance difference isn’t going to be quite as remarkable as on the ULV lineup, though we still expect these IVB CPUs to be able to turbo higher and more often.
Meanwhile the i5 versions of these CPUs take the requisite clock speed and L3 cache reductions. All three i5 CPUs have 3MB of L3 cache, base clock speeds between 2.5GHz and 2.8GHz, and of course lower prices. The HD 4000 GPU’s base clock speed is 650MHz for the entire lineup, while the maximum turbo clock is between 1100MHz and 1200MHz. The entire SV mobile IVB lineup features AES-NI and VT-x, and with the exception of the OEM-only i5-3210M, all of them feature TXT and vPro as well.
Finally, the chipsets these CPUs will be paired with should be familiar to you; Intel is using the same 7-series mobile chipsets that they first launched last month with quad-core mobile IVB, though we do have a bit more information on them compared to last month, particularly regarding power consumption.
|Intel 7-Series Mobile Chipsets|
|USB Ports (USB 3.0)||14 (4)||14 (4)||10 (4)||14 (4)||12 (4)|
|PCIe 2.0 Lanes||8||8||4||8||8|
|SATA Ports (6Gb/s)||6 (2)||6 (2)||4 (1)||6 (2)||6 (2)|
|Smart Response Technology & RAID||X||X||X||X|
|vPro & Active Management Technology||X||X|
|Small Business Advantage||X||X||X||X|
With the increasing number of functions handled by the CPU there are fewer and fewer things left for the supporting chipset, which makes many of the chipsets quite similar. Mostly, it's a question of maximum USB ports, PCIe lanes, SATA ports, and power envelope. UM77 is going to be the best candidate for use in Ultrabooks as it has the lowest TDP and lowest average power consumption thanks to its lack of VGA and LVDS monitor support. At the same time with only 4 PCIe lanes available from the chipset, it's only going to have enough bandwidth for Thunderbolt and little else (and at least one of those lanes will be used by a mini-PCIe slot for WiFi). Otherwise QM77, HM77, and HM76 all share the same 4.1W TDP and 1.22W average power and are more likely to be found alongside 35W CPUs.
With the CPU and chipset overview out of the way, it's time to get to the meat of today's review: the Ivy Bridge Ultrabook. Wait, what about architecture changes, die sizes, transistor counts, and all of those good tidbits? We've covered the architecture side already, and the only real change is in the loss of two cores and some of the L3 cache. Sadly, Intel didn't provide any information on how that affected die size or transistor count.
What we do know is that the quad-core Ivy Bridge die is 160mm2 and has 1.4B transistors. We did some quick and dirty estimates based on the removal of half the L3 cache and two CPU cores, and it looks like a dual-core IVB die should be in the neighborhood of 120mm2, but that's just an estimate. There are also rumors circulating that Intel might be harvesting quad-core die for dual-core use as well; that's certainly possible, though it seems unlikely the ULV parts would be harvested chips. Unfortunately, we don't have much else to say on the CPU die beyond that. We'll update with any additional details if we receive them, but now let's see what Intel has planned with their Ultrabook update.
Update: We cracked open the Zenbook Prime UX21A and measured its Core i7-3517U dual-core/GT2 Ivy Bridge CPU.
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mikk - Thursday, May 31, 2012 - linkWhy you don't record the frequency used in games with gpu-z? This would be interesting. And it would be also interesting to see how it performs with a disabled cpu turbo to give more headroom for the iGPU.
JarredWalton - Thursday, May 31, 2012 - linkGPU-Z doesn't detect HD 3000/4000 frequency; in fact, I'm not sure anyone has a utility that correctly reports HD 4000 core clocks. If I'm wrong, please let me know as I'd love to be able to do a FRAPS run and log the iGPU clocks! If you know of one, please post and/or email me.
mikk - Thursday, May 31, 2012 - linkJarredWalton: "GPU-Z doesn't detect HD 3000/4000 frequency; in fact, I'm not sure anyone has a utility that correctly reports HD 4000 core clocks. If I'm wrong, please let me know as I'd love to be able to do a FRAPS run and log the iGPU clocks! If you know of one, please post and/or email me"
You are wrong, gpu-z 0.6.2 fully supports the HD4000, you can "log to file" the frequency. I have tried it myself on a Desktop HD4000. It's interesting. Due to some driver issues some games did not run with the max turbo frequency ony my Desktop 77W model. It's fixed with driver build 2752. There are several turbo steps between base 350/650 and max turbo 1150 Mhz.
JarredWalton - Thursday, May 31, 2012 - linkGoing to go check now... I think I might have been running an older version (6.0?) I'll update the article when I have some details. Thanks for the heads up -- GPU-Z has failed to provide any useful information on HD 3000 for so long that I never noticed anything had changed! :-)
JarredWalton - Friday, June 1, 2012 - linkI've posted a follow up article, in case you don't see it over in Pipeline:
vegemeister - Wednesday, June 6, 2012 - linkCPU idle power doesn't mean much when you have to drive the backlight for a 17" screen. Smaller screens are more portable anyhow, and look better given the same resolution.
sonofsanta - Thursday, May 31, 2012 - linkSo are stardates always one month ahead of the real date, even if that stardate doesn't technically exist on the Gregorian calendar? ;)
(I'm guessing you meant May 31...)
JarredWalton - Thursday, May 31, 2012 - linkOh crap! And there aren't even 31 days in June! Hahahaha.... wrote that too late at night after a long day of testing/writing! But of course, actual Star Trek Stardates are never expressed with a month and year:
mschira - Thursday, May 31, 2012 - linkI am amazed how Intel professionals fail to realize that if a laptop does not have VGA out not even with a converter (note apple has VGA out with the right converter) it's useless for presentations.
This may be different for other people but for me one of the most important jobs of a laptop is to run a presentation at conferences and this sort.
I have yet find a conference location where you could hook up your laptop via display port. Or even DVI. They simply don't exist.
-> no VGA = useless.
JarredWalton - Thursday, May 31, 2012 - linkHDMI? I've seen plenty of HDMI projectors at least. But this is a prototype, and there will undoubtedly be Ultrabooks with VGA outputs (possibly via a converter). Anyway, Ultrabooks are a specialized market, so I don't expect most of them to target business users that need VGA outputs. Just because some people find VGA indispensable doesn't mean there aren't many others who wish the connector would just die already. It's basically just hanging around for legacy purposes, sort of like PS2 mice/keyboard connectors. In five more years I hope to be rid of all the old style connections on the majority of products (with those who absolutely need them catered to by niche products).