Intel's 4th gen processor codename: Haswell offers superior performance over the previous generation Ivybridge by up to 10% clock for clock. This astounding performance boost results in performance improvements in multi-tasking, encoding, gaming and multithreaded applications. Intel's 4th generation processor has improved PCI-Lane 3.0 bandwidth which helps further boost performance of latest generation 3 graphics cards for the ultimate gaming experience.
For overclocking enthusiasts, Intel's 4th gen CPU has improved memory overclocking support, with up to and beyond 3000MHz possible with the very best memory kits. Memory bandwidth is critically important to Haswell compared to previous generations. High frequency memory performance significantly improves encoding, gaming and benchmarking tasks.
The biggest leap in Intel's Haswell processor is the onboard graphics which is now up to 2.6x faster than previous HD4000 found in the Ivybridge CPU. What this means is these latest processors can actually play the latest games in HD with low/medium settings applied. Of course if you want to experience True HD gaming at maximum details then a dedicated graphics card is still a must.
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With PC and mobile converging quicker than ever before, Intel needs to reassert its presence in portable devices with an architecture that can scale across multiple platforms. That quest begins with the introduction of the fourth-generation Core processor family, codenamed Haswell.
Launched as a successor to last year's Ivy Bridge, Haswell follows Intel's tick-tock release schedu le, where a tick (Penryn 2008, Westmere 2010, Ivy Bridge 2012) primarily insinuates a shrink in manufacturing process, and a tock (Nehalem 2009, Sandy Bridge 2011, Haswell 2013) implies a major architectural refresh.
Yet, from a manufacturing point of view, not a whole lot appears to have changed. Looking at an overview of a quad-core desktop Haswell die, the chip is very similar to incumbent Ivy Bridge; it's built using the same 22nm Tri-Gate process and continues to carry 1.4 billion transistors, albeit in a slightly larger 177m² die (up from 160mm²).
Intel has taken a multifaceted approach to enhancing efficiency in Haswell as both a processor and a platform. At a silicon level, the company has introduced fine-grained control over which parts of the die are turned on or off. As we know, existing Ivy Bridge processors - that feature up to four IA cores, a graphics processor and a memory controller all hooked up to a ring-based interconnect - allow for the CPU and GPU to go idle, but other components remain active.
With Haswell, the philosophy is that if you don't need it, it ought to be turned off. In order to make this happen, Intel has added more power gating and decoupled the ring-based interconnect and L3 cache from the IA cores, allowing, for example, the GPU access to the ring bus without waking the IA cores. Expanding on this granularity, ultra-low-power Haswell mobile processors will be equipped with deeper C-States (C8, C9, C10) that allow practically everything to be turned off when idle. In addition, fourth-generation processors are said to switch between states 25 per cent faster than their third-generation predecessors.
Taking into account connected systems as a whole, Intel has also created a more suitable middle ground between the ACPI specification's S3/S4 sleep and S0 active states by introducing new active-idle states dubbed S0i1 and S0i3. With previous-generation platforms, putting a computer to sleep and waking back up was achievable in just a couple of seconds, but the experience wasn't as quick as, say, on a smartphone or tablet.
Haswell's primary ambition may be to drive down power consumption, but it wouldn't be a new Intel architecture without performance improvements on both the CPU and GPU fronts.
One of Haswell's most striking enhancements is that the number of back-end execution ports has been upgraded from six to eight. This is the first increase in execution ports we've seen since Conroe, and the new additions give Haswell a fourth port for math logic and a fourth for store address calculations.
Ensuring that the wider back-end is well fed, Intel has also made further branch prediction improvements to ensure fewer cache misses. As you might expect, faster buffers and faster access to level one memory are also a priority. Each Haswell core continues to be served exclusively by a 64KB L1 cache and a 256KB L2 cache, with a third last-level cache of up to 8MB shared across all cores, the graphics processor and system agent.
This time around, L1 store bandwidth is doubled from 16 bytes/cycle to 32 bytes/cycle, and interface bandwidth between the L1 and L2 caches has doubled from 32 bytes/cycle to 64 bytes/cycle. Although Haswell is officially described as new micro-architecture, it's clear that it has a lot in common with earlier generations and the focus has been on getting the most out of a tried-and-trusted system.
In order of performance, Haswell's IGP will be available in at least half-a-dozen models; Iris Pro 5200; Iris 5100; HD 5000; HD 4600; HD 4400 and HD 4200. The reason for this is that, unlike Ivy Bridge's HD 4000 IGP, the graphics in Haswell have been deliberately designed to be scalable. The amount of scalability is reflected in the number of execution units, in what Intel calls a slice, and the operating frequency of each core will be dependant upon processor positioning.
The top-of-the-range Iris Pro 5200 is said to have 40 execution units, while the middle-of-the-pack HD 4600 is believed to have 20. This compares to 16 such units in the best Ivy Bridge chips, but remember, the execution units themselves have been overhauled for Haswell and can't be compared directly.
Making matters even more interesting, and illustrating Intel's need to push graphics performance, certain Haswell IGPs will be paired with a dedicated eDRAM frame buffer that will be accessible to both the CPU and GPU, and will further benefit performance in either workload.
All of the architectural advancements in Haswell have resulted in the need for a new LGA1150 socket and, therefore, a new supporting 8-series chipset headlined by the Z87. The new chipset natively supports more high-speed USB and SATA interfaces, and it is designed to be physically smaller, making it easier for motherboard manufacturers to create Z87 solutions that are more compact, less-cluttered and more efficient.
To satiate the needs of overclockers, Intel has borrowed from the X79 platform and reintroduced base clock ratios. What this means is that, like Sandy Bridge Extreme, Haswell processors will run at a choice of three base clocks: 100MHz, 125MHz and 166MHz, with a bit of extra wiggle room thrown in. This means that you should be able to overclock every Haswell chip - even a mid-range Core i5-4570 might run at 4GHz, provided it's stable when the default 32x multiplier is partnered to a 125MHz base clock.
Of course, the premium multiplier-unlocked parts offer extra incentive. Intel allows an 80x multiplier at 100MHz, up to 64x at 125MHz and up to 48x at 166MHz. There are various ways of getting to 8GHz, but while neither Sandy Bridge nor Ivy Bridge offered such flexibility, remember that, as always, your overclocking mileage will vary.
Desktop Haswell Processor Suffixes
No suffix - standard processor aimed at the mainstream
K - multiplier unlocked, providing greater overclocking potential for enthusiast users
P - no integrated graphics processor
R - high performance Intel Iris graphics, BGA package
S - "performance optimised lifestyle," features a lower CPU base frequency and a reduced TDP
T - "power optimised lifestyle," features a lower CPU base frequency, a lower Turbo Boost frequency and a greatly-reduced TDP
An examination of the Haswell architecture suggests that fourth-generation processors will be up to 20 per cent faster than the previous generation in CPU-intensive tasks, and up to 50 per cent faster in IGP-intensive tasks, when evaluated over a wide range of benchmarks. A more efficient architecture and a revamped integrated graphics processor are the primary instigators for this performance increase.
Yet, while performance is up, Haswell's greatest strength lies in the energy-saving department. Intel's latest chips, designed for a new breed of ultra-thin, ultra-efficient PCs, are without doubt the most advanced to date, and will scale across a wide range of devices ranging from tablets to servers.
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