Ivy Bridge Debuts: Intel Core i7-3770K ReviewSince late last year Ivy Bridge seems to be the architecture everyone is waiting for. Although Intel is only anticipating a 10–15% processing performance bump when compared to Sandy Bridge, the big news comes in the form of improved graphics and efficiency, thanks to the move to a 22nm design process using new 3D transistor technology we recently explained in detail here.


Today the company is unveiling its full new line of Core i7 and Core i5 processors, accompanying chipsets and Centrino wireless options. Ivy Bridge is a 'tick' release, but Intel is calling it a tick+ due to the more significant overhaul the graphics side of things is getting. The new chips are set to provide 20–50% better GPU performance over Sandy Bridge, the kind of jump we'd normally expect from a tock release.

Ivy Bridge Debuts: Intel Core i7-3770K ReviewS

To be fair, Intel has gotten by with lackluster GPU performance from their integrated chipsets for years. When they moved the GPU on-die they continued to peddle the same subpar performance, and to this day they lag way behind, but that's not to say things haven't changed dramatically for the better. Features and performance have scaled to the point that integrated graphics are capable of playing high-definition content, handling more than a single screen, multiple inputs, offering wireless display technology, among others.

Intel is preparing another big graphics performance bump when the Haswell architecture hits the market next year. But in the meantime, for the same money consumers should be looking at faster performance and even better efficiency with the Ivy Bridge architecture.

Ivy Bridge Debuts: Intel Core i7-3770K ReviewS

For a while it appeared the move to the new manufacturing process would cause a delay of several months, but the company was able to reduce that to a few weeks. As you know, Ivy Bridge's companion chipset release remained on track. The new 7-series chipsets are backwards compatible with Sandy Bridge processors, so it's been possible to purchase a Z77 motherboard and actually use it for a few weeks now.

Having already discussed the new Tri-Gate transistors in great detail, the new 7-series chipsets, and some of the motherboards that use them, we are going to focus primarily on the Core i7-3770K processor in this review.

3rd Gen Intel Core Lineup

The Ivy Bridge lineup is comprised of several desktop and mobile Core i7 and Core i5 processors that will effectively replace most of the current offerings under those series. Core i3 variants will make it to market on the second half of the year.

The new Core i7 desktop processors include the Core i7-3770K, i7-3770, i7-3770T and i7-3770S — all selling for $278 except for the i7-3770K that sells for a slight premium at $313. If you ask us, it's a little bit like the unnecessary multiple flavors of Windows Vista/7, but that's the way Intel is going about their CPUs these days. The Core i7-3770K and i7-3770 are identical in almost every way, with a few key exceptions. The K version comes with an unlocked multiplier and is 100MHz faster out of the box. The Intel vPro/TXT/VT-d/SIPP technologies have also been removed from the K series.

The Core i7-3770S and i7-3770T are members of the low power series (second chart below) and as such the TDP has been reduced from 77w down to 65w and 45w, respectively. A determining factor in achieving this lower consumption is a lower CPU base frequency, reduced from 3.50GHz to just 3.10GHz for the i7-3770S and 2.50GHz for the i7-3770T.

Ivy Bridge Debuts: Intel Core i7-3770K ReviewS

All Ivy Bridge Core i7 desktop processors feature 4 cores with 8 concurrent threads when using Hyper-Threading. The Core i7 3770K operates at 3.50GHz with a Turbo Boost frequency of 3.90GHz, while the non-K version features the same Turbo Boost frequency with a base clock of 3.4GHz. They are designed to work with DDR3-1333 memory and feature an 8MB L3 cache.

Then there is the new Core i5 series which features the i5-3570K, i5-3550, i5-3470 and i5-3450 processors ($194 for the K version, $174 for the rest). There are also the Core i5-3570T, i5-3550S, i5-3470T, i5-3470S and Core i5-3450S low power models, we know, it gets very confusing, so let's talk about the standard processors first.

All standard Ivy Bridge Core i5 processors carry a 77W TDP and feature four cores and four concurrent threads. The only Core i5 processor to differ from this configuration is the i5-3470T which features two cores with Hyper-Threading for four threads.

The Core i5 range is clocked aggressively: the i5-3570K and i5-3570 operate at 3.40GHz with a Turbo Boost frequency of 3.80GHz. The i5-3550 operates at 3.30GHz with a Turbo Boost speed of 3.70GHz, the i5-3470 has a base clock of 3.20GHz and can reach 3.60GHz when using Turbo Boost.

Finally the Core i5-3450 has a base clock of 3.10GHz and a Turbo Boost frequency of 3.50GHz. All Core i5 processors feature a 6MB L3 cache with the exception of the i5-3470T which has been downgraded to 3MB.

All Core i5 processors use the Intel HD Graphics 2500 engine with the exception of the i5-3570K which uses the HD Graphics 4000 engine.

Ivy Bridge Debuts: Intel Core i7-3770K ReviewS

The low-power Core i5 range is equally confusing. The five models available at launch are different though many of them occupy the same price range. The Core i5 3470T is essentially a Core i3 processor with Turbo Boost added. This processor operates at 2.90GHz with a Turbo Boost speed of 3.50GHz. However like the Core i3 processors, the i5 3470T features only two cores with Hyper-Threading support and a smaller 3MB L3 cache, it is said to cost $174.

Then there is the Core i5-3570T and i5-3550S (both $194). The i5-3570T features a thermal design rating of 45w and works at 2.30GHz with a Turbo Boost frequency of 3.30GHz. The i5-3550S is actually faster, working at a base clock of 3.0GHz with a Turbo Boost frequency of 3.37GHz. As you would expect the i5 3550S has a higher TDP rating of 65w.

Finally we have the Core i5-3470S and i5-3450S processors (both $174) which feature a TDP rating of 65w. The Core i5-3470S has a base clock of 2.90GHz with a Turbo Boost frequency of 3.60GHz, while the i5-3450S works at 2.80GHz with a Turbo Boost of 3.50GHz. Like the Core i7-3770K and i5-3570K, the i5-3450S also misses out on Intel vPro/TXT/VT-d/SIPP technologies.

3rd Gen Intel HD Graphics

The first generation of on-die Intel HD graphics, which was released with the Westmere architecture, wasn't actually on-die as such, rather on-package. The on-package graphics engine was separate from the CPU. Furthermore, it was built using the 45nm process and not the same 32nm process used by the actual CPU.

Then the second generation (Sandy Bridge) graphics changed all that by including the GPU on-die, meaning that it's also built using the same 32nm process as the CPU. Even though both are now under the same roof, the GPU is still independent of the CPU. It features its own clock domain, meaning that it can be clocked independently and can be powered down as needed.

This same design principle has been used for the Ivy Bridge architecture, Intel has simply added more horsepower. There are again two different versions of the Intel HD graphics and the Ivy Bridge processors can either use the HD 2500 or the faster HD 4000 graphics engine.

Ivy Bridge Debuts: Intel Core i7-3770K ReviewS

They can be clocked up as high as 1350MHz and support a maximum resolution of 2560x1600. Rendering support includes DirectX 11, OpenGL 3.1 and Shader Model Support 4.1. In contrast, the previous generation supported DirectX 10.1 and OpenGL 3.0.

Ivy Bridge Debuts: Intel Core i7-3770K ReviewS

The shaders, cores and execution units are what Intel calls EUs (Execution Units) with HD Graphics 2500 featuring six and the speedier HD Graphics 4000 getting sixteen. Interestingly, most Core i5 desktop processors use the slower HD Graphics 2500 engine, while all mobile processors receive the 4000 engine.

Besides the increased resolution support (up to 2560x1600 from 1920x1200 previously), the new Intel HD graphics now support triple monitors. The Sandy Bridge processors were limited to dual displays much like Nvidia graphics cards. However the new Ivy Bridge graphics can simultaneously support three displays which is a nice upgrade.

Intel claims the 3rd Generation Core processor graphics delivers greater 3D performance and API improvements over Sandy Bridge, such as 2x better performance in 3Dmark Vantage. Intel also says that the Ivy Bridge Intel HD 2500 is expected to perform ~10-20% higher than Sandy Bridge Intel HD 2000 on 3D graphics workloads. Right off the bat, we recommend you focus more on features and encoding performance than gaming, as you will see on our benchmarks later on this review.

Test System & Memory Performance

Intel LGA2011 Test System Specs
- Intel Core i7-3960X Extreme Edition (3.30GHz)
- Intel Core i7-3820 (3.60GHz)
- x4 2GB G.Skill DDR3 PC3-14900 (CAS 8-9-8-24)
- Gigabyte G1.Assassin2 (Intel X79)
- OCZ ZX Series 1250w
- Crucial m4 256GB (SATA 6Gb/s)
- Gigabyte GeForce GTX 580 SOC (1536MB)
Software
- Microsoft Windows 7 Ultimate SP1 64-bit
- Nvidia Forceware 296.10

AMD AM3+ Test System Specs
- AMD Phenom II X6 1100T (3.30GHz)
- AMD Phenom II X4 980 (3.70GHz)
- AMD FX-8150 (3.60GHz)
- AMD FX-8120 (3.10GHz)
- AMD FX-6100 (3.30GHz)
- AMD FX-4170 (4.20GHz)
- x2 4GB G.Skill DDR3 PC3-14900 (CAS 8-9-8-24)
- Asrock Fatal1ty 990FX Professional (AMD 990FX)
- OCZ ZX Series 1250w
- Crucial m4 256GB (SATA 6Gb/s)
- Gigabyte GeForce GTX 580 SOC (1536MB)
Software
- Microsoft Windows 7 Ultimate SP1 64-bit
- Nvidia Forceware 296.10

Intel LGA1366 Test System Specs
- Intel Core i7-975 Extreme Edition (3.33GHz)
- Intel Core i7-920 (2.66GHz)
- x3 2GB G.Skill DDR3 PC3-12800 (CAS 8-8-8-20)
- Gigabyte G1.Sniper (Intel X58)
- OCZ ZX Series 1250w
- Crucial m4 256GB (SATA 6Gb/s)
- Gigabyte GeForce GTX 580 SOC (1536MB)
Software
- Microsoft Windows 7 Ultimate SP1 64-bit
- Nvidia Forceware 296.10

Intel LGA1155 Test System Specs
- Intel Core i7-3770K
- Intel Core i7-2600K
- Intel Core i5-2500K
- x2 4GB G.Skill DDR3 PC3-14900 (CAS 8-9-8-24)
- Asrock Z77 Extreme6 (Intel Z77)
- OCZ ZX Series 1250w
- Crucial m4 256GB (SATA 6Gb/s)
- Gigabyte GeForce GTX 580 SOC (1536MB)
Software
- Microsoft Windows 7 Ultimate SP1 64-bit
- Nvidia Forceware 296.10

Intel LGA1156 Test System Specs
- Intel Core i5-750
- x2 4GB G.Skill DDR3 PC3-12800 (CAS 8-8-8-20)
- Gigabyte P55A-UD7 (Intel P55)
- OCZ ZX Series 1250w
- Crucial m4 256GB (SATA 6Gb/s)
- Gigabyte GeForce GTX 580 SOC (1536MB)
Software
- Microsoft Windows 7 Ultimate SP1 64-bit
- Nvidia Forceware 296.10

Ivy Bridge Debuts: Intel Core i7-3770K ReviewS

The memory bandwidth performance of the Core i7-3770K is similar to that of the i7-2600K, in fact the slight increase in performance can likely be attributed to the 100MHz bump in clock frequency.

Ivy Bridge Debuts: Intel Core i7-3770K ReviewS

Although the memory bandwidth wasn't improved greatly compared to the Core i7-2600K, the L2 cache performance does. The write performance in particular was much faster when using the Core i7-3770K.

Continue Reading

Synthetic Performance
Application Performance
Encoding Performance
Discrete GPU Performance
On-die GPU Performance
Overclocking Performance
Power Consumption
Final Thoughts

Republished with permission from:
Ivy Bridge Debuts: Intel Core i7-3770K ReviewSteven Walton is a writer at TechSpot. TechSpot is a computer technology publication serving PC enthusiasts, gamers and IT pros since 1998.