The Intel Ivy Bridge (Core i7 3770K) Review
by Anand Lal Shimpi & Ryan Smith on April 23, 2012 12:03 PM EST- Posted in
- CPUs
- Intel
- Ivy Bridge
Overclocking and 22nm
In the old days, whenever Intel transitioned to a new manufacturing process it was accompanied by increased overclocking headroom thanks to the reduction in power consumption and increase in switching speed afforded by the new transistors. To be honest, it's surprising the ride has even lasted this long.
Intel's 22nm process (P1270) is the most ambitious yet. The non-planar "3D" transistors promise to bring a tremendous increase in power efficiency by increasing the surface area of the transistor's inversion layer. It's the vehicle that will bring Intel into new form factors in mobile, but we're around a year away from Haswell's introduction. Rather than 22nm being a delivery platform for Ivy Bridge, it feels like Ivy Bridge is being used to deliver 22nm.
The process is still young and likely biased a bit towards the lower leakage characteristics of lower voltage/lower wattage CPUs, such as those that would be used in Ultrabooks. These two factors combined with some architectural decisions focused on increasing power efficiency result in what many of you may have heard by now: Ivy Bridge won't typically overclock as high as Sandy Bridge on air.
The frequency delta isn't huge. You'll still be able to hit 4.4—4.6GHz without resorting to exotic cooling, but success in the 4.8—5.0GHz range will be limited to water alone for most. Ivy Bridge is also far more sensitive to voltage than Sandy Bridge. Heat dissipation can increase significantly as a function of voltage, so you'll want to stay below 1.3V in your overclocking attempts.
Dr. Ian Cutress, our own Senior Motherboard Editor, put Ivy Bridge through a pretty exhaustive investigation if you want more details on exactly how the chip behaves when overclocking and how best to overclock it.
For the past few years I've been focused on power efficient overclocking. I'm looking for the best gains I can get without significant increases in core voltage. With my 3770K I was able to reliably hit 4.5GHz with only a 140mV increase in core voltage:
The end result is a 15—28% overclock, accompanied by a 32% increase in power consumption. The relationship between overclock speed and power consumption actually hasn't changed since Ivy Bridge, at least based on this datapoint.
| Ivy Bridge Overclocking | |||||
| Intel Core i7 3770K | Stock | 4.6GHz Overclock | % Increase | ||
| Load Power Consumption | 146.4W | 204W | 39.3% | ||
| x264—2nd Pass | 41.8 fps | 49.5 fps | 18.4% | ||
As always, your mileage may vary depending on the particular characteristics of your chip. Ivy Bridge can be overclocked, but at least initially it's not going to be as good of an overclocker as Sandy Bridge. Over time I expect this to improve somewhat as Intel's 22nm process matures, but by how much remains a question to me. It's unclear just how much of these limits are by design vs. a simple matter of process maturity.
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bman212121 - Monday, April 23, 2012 - link
Does anyone know which motherboards are going to support VT-d? Is there a specific chipset you'll need to have or will it just be up to the vendor to decide?Thanks,
Bman
Magichands8 - Monday, April 23, 2012 - link
I feel so ambivalent about Intel's current strategy. I admit I really don't understand why laptops are moving ahead so significantly. Why on earth would someone want to buy a laptop to replace a home desktop system? And if they aren't doing that then how can Intel justify a move away from the high performance end of the spectrum? If you really need to do business work away from home AND away from work then I can see the need for the mobility that a laptop can provide but this focus on a gaming-centric platform so that people can one day soon play Crisis on their laptop at traffic stops on the way to work is utterly baffling to me. On the other hand, the process technology and architectural improvements we are seeing are amazing. It just burns me that performance for what I use a desktop for is essentially at a standstill now so that Intel can save this unfathomable laptop crowd a few watts during the occasional vacation. As it stands when I see a review like this at first I'm like "Oh wow!" and then I feel cheated for having waited for Intel's latest and greatest. Ivy Bridge-E and Haswell-E better be mind blowing or I'm going to be completely crestfallen at the direction that Intel is taking.Quantumbytes - Monday, April 23, 2012 - link
Intel is following a strategy that will in the end provide compute power for small and powerfull devices like cell phones, laptops, tablets, RFIDs, food and apparel tags, etc. They are looking at the big picture and the money is in the small designs. Desktops are a means to an end. Get used to the push to small and simple.JarredWalton - Monday, April 23, 2012 - link
Thanks for being an AMD apologist and reading with blinders. Trinity will probably maintain the GPU performance gap. Until Trinity arrives, however, IVB HD 4000 on laptops on average across 15 games is equal to Llano A8 on laptops.And what other things are people doing with graphics besides games? Video transcoding? Okay, there's one task. Name another that computer users do on a regular basis. [Crickets...]
So why is Intel putting so much effort into graphics? Because their business is to sell you a new microprocessor every 2-3 years if they can. With the ability to put 1.4 billion transistors into a 130mm^2 die, what else are they supposed to do? More cache? More CPU cores? You try to make the worst aspect of your product better, and then you market it to the masses. That's all that's really happening here.
frozentundra123456 - Monday, April 23, 2012 - link
Most Llano laptops I have seen are not even the A8 model, but mostly the A6, with somewhat lower graphics capabilities. So I think you are being very fair to AMD in comparing their top of the line graphics to HD4000, instead of the lower performance A6 graphics.André - Monday, April 23, 2012 - link
"Unfortunately at the time only Apple was interested in a hypothetical Ivy Bridge GT3 and rumor has it that Otellini wasn't willing to make a part that only one OEM would buy in large quantities. We will eventually get the GPU that Apple wanted, but it'll be next year, with Haswell GT3. And the GPU that Apple really really wanted? That'll be GT4, with Broadwell in 2014."Can't help but wonder were you got this tidbit from? :-)
Very interesting.
André - Monday, April 23, 2012 - link
D'oh ... spelling.Where you got the tidbit from even.
SC-D_E_A_T_H - Monday, April 23, 2012 - link
I'll be sticking with my AMD Sempron 3400+. A processing badass!DanNeely - Monday, April 23, 2012 - link
"How many enthusiasts who overclock their computers are going to be running them *at full load* 24/7? None. "I do. The 30W difference at stock would be ~$40/year directly (13c/kwh); and probably twice that indirectly since my LL pays for heat during the winter, but the AC bills all mine. Vs my current x58 boxes, probably another factor of 1.5-2x; although unless OC levels creep up over the next few months I'm tempted to just wait and hope haswell doesn't burn all its improvements on the IGP and lower TDP for mobile.
Malih - Monday, April 23, 2012 - link
Somehow I'm no longer hungering for the top performance CPU.CPU performance has somewhat exceed most people daily needs (and mine too), and mobile CPUs are more exciting today, especially if they can help the system to consume less battery and have better graphics. I think its now safe enough for manufacturer like for example Apple to go for Trinity instead of Ivy Bridge for their MB Air, provided Trinity can be made to consume minimal power.