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Intel Core i7 5775C Review


Intel Core i7 5775C Testing:

To see what kind of performance the Core i7 5775C from Intel delivers will involve running it and its comparison products through OCC's test suite of benchmarks, which include both synthetic benchmarks and real-world applications. The gaming tests will also consist of both synthetic benchmarks and actual gameplay, in which we can see if similarly-prepared setups offer any performance advantages. The system will receive a fully updated, fresh install of Windows 7 Professional 64-bit edition, in addition to the latest chipset drivers for each board and GeForce drivers for the NVIDIA GTX 770. To ensure as few variables as possible, all hardware will be tested at their stock speeds, timings, voltages, and latencies, unless otherwise stated. Turbo Boost will be disabled on all processors to make a fair comparison without skewing results. After stock speed testing, each processor will then be overclocked as much as possible, while still maintaining full stability.


Testing Setup: Intel (Socket 1150)


Testing Setup: Intel Socket 2011 V-3


Testing Setup: Intel Socket 2011


Testing Setup: AMD (Socket AM3+)



Overclocked settings:

  • Processor: Intel Core i7 5775C  4300MHz 100MHz x 43


Getting the most out of the Broadwell 14nm Core i7 5775C was a bit more difficult than what I saw with the 22nm Haswell-based processors I have looked at so far. Out of the box, this 65W part will run at a 3.7GHz Turbo Boost 2.0 clock speed all day long. The Core i7 4790K runs at up to 4.4GHz in the same scenario, so there is a clock speed variance that may be tough to overcome with the Core i7 5775C.

Using the same avenues to overclock the Core i7 5775C as I have with Intel's Haswell processors, I was surprised at how soon additional voltage was needed to get the most out of this processor. At speeds up to 4.1GHz, the Core i7 5775C required nothing more than increasing the core clock multiplier to 41 and firing up whichever test you wanted and it was stable. At 4.2GHz, you have to start applying additional voltage (1.255v) to get the speed stable and at 4.3GHz, you need an even higher level of voltage to finally reach a stable overclock. It took 1.375v to get stable at the 4.3GHz mark. A 4.4GHz speed can be done, but with this processor, voltages up to 1.45v were needed to get it benchmark stable; for long term use it may not be the best option for scaring up some performance. Upping the cache ring ratio can improve performance, but doing so is a balancing act you have to manage. Some of the management comes from adjusting the operating voltages as well as finding out the limits of the cache ring bus when using specific DRAM memory speeds.

Since my test system memory kit is a 2400MHz 16GB kit from Patriot, I left the memory speed at 2400MHz using the XMP profile on the MSI Z97 Gaming 7 motherboard and adjusted the cache ring ratio up. I found that 40 was about the maximum ratio I could set and run stable, although it took voltages of 1.375v core and 1.36v cache that, in the long term, would prove detrimental to the processor. My results may vary from others and is typical, since all processors will overclock differently. A more reasonable overclock of 4.2GHz core and 3.9GHz on the cache ring bus are much easier on the core with the voltage needed to jump from 4.1GHz to 4.3GHz.

Overclocking the integrated Iris Pro Graphics was a bit challenging as well. The base clock speed on the graphics core is 1150MHz with an 1800MHz eDRAM memory clock speed. At this time, only the core was able to be overclocked. An improved BIOS for Z97 boards will allow us to take advantage of memory overclocking in the future. Bumping the graphics core multiplier up to 26 resulted in a 1300MHz core clock speed that did improve graphics performance in both 3DMark and Metro: Last Light where I was able to play at FPS levels around 40FPS using low settings at 1680 x 1050. Pretty stout for an integrated solution.



Maximum Core Clock Speed:

Each CPU has been tested for stability at the listed overclocked speeds. These clock speeds will represent the level of performance shown by the overclocked scores in the testing.




  • Scientific & Data:
  1. Apophysis
  2. WinRAR
  3. Geekbench 3
  4. Bibble 5
  5. Office 2010
  6. POV-Ray 3.7
  7. ProShow Gold
  8. HandBrake .99
  9. Sandra 2014 SP2
  10. AIDA64
  11. Cinebench R15
  12. X.264 Benchmark
  13. PC Mark 8
  • Video:
  1. Metro: Last Light
  2. Batman: Arkham Origins
  3. 3DMark

Well we have our lineup and maximum stable overclocks for each respective CPU; time to see what results we get.

  1. Intel Core i7 5775C: Introduction & Closer Look
  2. Intel Core i7 5775C: Specifications & Features
  3. Intel Core i7 5775C Testing: Setup & Overclocking
  4. Intel Core i7 5775C Testing: Apophysis, WinRAR, GeekBench, Bibble 5
  5. Intel Core i7 5775C Testing: Office 2010, POV-Ray, ProShow Gold, HandBrake
  6. Intel Core i7 5775C Testing: SiSoft Sandra, AIDA 64
  7. Intel Core i7 5775C Testing: Cinebench R15, X.264, PCMark 8
  8. Intel Core i7 5775C Testing: Metro: Last Light
  9. Intel Core i7 5775C Testing: Batman: Arkham Origins
  10. Intel Core i7 5775C Testing: 3DMark
  11. Intel Core i7 5775C Testing: IGP Performance
  12. Intel Core i7 5775C: Conclusion
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