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
Model i7-3667U i7-3517U i5-3427U i5-3317U
Cores/Threads 2/4 2/4 2/4 2/4
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
VT-x Yes Yes Yes Yes
AES-NI Yes Yes Yes Yes
TXT/vPro Yes No Yes No
TDP 17W 17W 17W 17W
Package BGA BGA BGA BGA
Estimated Price $346 N/A $225 N/A

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
Model i7-3520M i5-3360M i5-3320M i5-3210M
Cores/Threads 2/4 2/4 2/4 2/4
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
VT-x Yes Yes Yes Yes
AES-NI Yes Yes Yes Yes
TXT/vPro Yes Yes Yes No
TDP 35W 35W 35W 35W
Package rPGA/BGA rPGA/BGA rPGA/BGA rPGA/BGA
Estimated Price $346 $266 $225 N/A

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
Model QS77 QM77 UM77 HM77 HM76
TDP 3.6W 4.1W 3.0W 4.1W 4.1W
Average Power 1.15W 1.22W 0.84W 1.22W 1.22W
Package Size 22x22 25x25 25x25 25x25 25x25
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)
VGA Output X X   X X
LVDS Output X X   X X
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.

Meet the Second Generation Ultrabook
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  • ananduser - Thursday, May 31, 2012 - link

    I'm going to chicken out, out of this one :) Reply
  • Hector2 - Thursday, May 31, 2012 - link

    Jarred is spot on. There's a mobility review on another tech website that shows how badly Llano's performance dives when fitting it into the lower TDP platform as compared to IVB. Reply
  • ssiu - Thursday, May 31, 2012 - link

    So what is the holdup in getting 17W mobility Trinity review? Didn't AMD announce the 17W part at the same time as the 35W part? (Unlike Intel who announced the quad Ivy first, and 17W part was under NDA until now.) Reply
  • JarredWalton - Thursday, May 31, 2012 - link

    Getting hardware. No one is shipping the LV/ULV Trinity stuff yet, and AMD didn't send out a prototype with one or both of those chips. They may not be under NDA, but they're not available for purchase anywhere that I know of. Reply
  • R3MF - Thursday, May 31, 2012 - link

    "Given the 17W and 25W TDP on the A6-4455M and A10-4655M, they could easily fit in similar sized laptops (e.g. HP’s “Sleekbooks”). "

    Unfortunately HP are being utter cretins and only offering Trinity in the 15.6" Sleekbook, and not the 14" version.

    WHY!
    Reply
  • Spunjji - Thursday, May 31, 2012 - link

    Because Intel, duh. :/ Reply
  • R3MF - Thursday, May 31, 2012 - link

    i'm not sure that logic applies.

    they allow the 15.6" Sleekbook to roll with an AMD APU.........................

    but why not the 14" Envy 4!
    Reply
  • kallogan - Thursday, May 31, 2012 - link

    So ULV gpu base clocks are half of regular core i7 HD 4000. Not surprising they are not performing very well.

    On the cpu side it's pretty awesome. I mean Max dual core turbo is 3,0 ghz for the highest ulv cpu. I guess it's possible to run on turbo forever if the cooling system allows it. Too bad it's only BGA.

    I don't know if there is 17 inches notebooks with ulv on board. Saw some 17 inch sitting at 10-15W while idling even with regular core i5. Would love a low power 17 inch.
    Reply
  • JarredWalton - Thursday, May 31, 2012 - link

    The HD 4000 ULV clocks are interesting. Base clocks are very low, but maximum clocks are quite high. WIth better cooling and configurable TDP (e.g. TDP Up or whatever it's called), it's possible there will be Ultrabooks that manage to get within 10% of the quad-core HD 4000 for graphics performance. However, Intel is only guaranteeing a rather low 350MHz iGPU clock, so in practice I bet average gaming clocks will be in the 700-900MHz range. Reply
  • IntelUser2000 - Thursday, May 31, 2012 - link

    If there's one thing Apple is clearly ahead is managing thermals. Macbook Air's graphics performance is pretty darn close to top performance. Reply

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