Intel Core i7-3770 Quad-Core Processor 3.4 GHz 4 Core LGA 1155 - BX80637I73770 Online
- Model: Intel Core i7 Processor i7-3770
- Clock Speed: 3.4 GHz
- Max Turbo Frequency: 3.9 GHz
- DMI: 5 GT/s
- Intel Smart Cache: 8 MB
- Graphics Base Frequency: 650 MHz
- Max Memory Bandwidth:?25.6 GB/s
Best Review: Intel Core i7-3770 Quad-Core Processor 3.4 GHz 4 Core LGA 1155 - BX80637I73770 - This is one of Intel's highest-value quad-core chips. It has very low power usage, a number of enterprise features missing on the 3770K, and does in fact overclock.FEATURES:i7 3770: 3.4 GHz* Hyperthreading (4 actual cores, 8 visible ones)* Partially unlocked turbo multiplier* vPro, VT-d, Trusted Execution (for better security and faster virtual machines)i7 3770K: 3.5 GHz* Hyperthreading (4 actual cores, 8 visible ones)* Unlocked base and turbo multipliersThe i5 3750 and 3750K have the same differences, but both operate at 3.4 GHz and neither has Hyperthreading. The latter can add 10-20% performance with heavily multi-threaded workloads like CAD rendering and video compression. VT-d reduces processor load with certain virtualized I/O operations by a factor of 2. For a workstation or server, I'd choose a chip with that feature, but verify that your motherboard supports it. Most ASRock and Gigabyte boards do; Asus boards for this chip do not. See the comments attached to this review for some useful guidance.OVERCLOCKING:The basic mechanism to determine clock speed is to multiply the system clock (a 'base' clock, typically 100 MHz or so that regulates the various other components in the system) by a multiplier. With modern chips, the multiplier varies dynamically based on system load. At idle, this chip operates at 1.6 GHz. At full load, it upclocks all four cores to 3.4 GHz. If the chip senses additional leeway in temperature and power use, the cores continue to 3.7 GHz. A three-core load could reach 3.8 Ghz, and two cores or less, 3.9 GHz.Each core has its own multiplier that is often, but not always, the same as the others. Some workloads may benefit from one or two cores clocked higher than all four could be without exceeding the chip's thermal capacity. Intel deems this ability to individually regulate core multipliers to provide maximum performance within a given thermal envelope "Turbo Boost".With the i7 3770K, the base multiplier and the turbo multipliers are unlocked. You can force the chip to hold a base multiplier above 35. Turbo may be unnecessary or counterproductive if the base multiplier already has the chip near the edge of its thermal capacity.With this i7 3770, the base multiplier is never higher than 34, but you can add up to four 100 MHz 'bins' to the Turbo multiplier. The maximum four-core frequency becomes 4.1 GHz, though subject to the whims of the turbo system. If your hardware allows, you can also boost the base clock to perhaps 105 MHz, yielding 4.3 GHz. Most people with the 3770K model don't do better than 4.6 or 4.7 GHz with air-cooling, so it's not as if this 3770 leaves a lot on the table.Those interested in frequency records might prefer the Sandy Bridge 2500/2600/2700 chips that predated this Ivy Bridge line. The Sandy Bridge die was about 1/3 larger and more effective at dissipating heat, outstripping the power reductions Ivy Bridge gained by moving to a smaller manufacturing process. Sandy Bridge chips are more easily pushed to 4.8 to 5 Ghz. They're about 10% slower at the same frequency, however, so the performance result is a wash.POWER CONSUMPTION:i7 3770Asus P8Z77-LK4 x 8 GB DDR3 1600 MHz256 GB Samsung SSD2 TB 5400 RPM Samsung HDSeasonic S12II-430W (~85% efficient)Kill-A-Watt meterPrime95 x64Idle: 44WLoad: 148WIdle: (turbo + 4 bins): 44WLoad: (turbo + 4 bins): 185WIdle: (turbo + 4 bins, 105 MHz base): 55WLoad: (turbo + 4 bins, 105 MHz base): 215WThis is a very impressive performance. Idle power use is even lower than my dramatically slower, underclocked AMD Athlon X2 system. Under load, it benefits from a larger third-party heatsink. The stock cooler is effectively silent at idle, but tends to ramp the fan up quickly with heavy computing. The fan character is not offensive. It does constantly vary itself, though, so it's difficult to tune out. I favor large, heavy tower heatinks (700g or more) with 120mm fans for silence.PERFORMANCE & ALTERNATIVES:Windows runs noticeably faster with this chip than the i7 875K @ 4 GHz system I assembled in early 2010. Photoshop CS5 takes 4 seconds to open on that system and 2.5 on the new one. The best alternative for many users will be the i5 3570, which is about 80% as fast for $100 less with all the same enterprise features.The gulf between all of these top-tier Ivy Bridge quads isn't terribly wide; unless the chip is physically missing a feature important to you, you can't take a step wrong.
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