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Intel Core i7-5775C 3.3GHz Broadwell LGA-1150 CPU Performance Overview

By: Steven Bassiri | Intel CPUs in CPUs, Chipsets & SoCs | Posted: Jul 2, 2015 2:13 pm

Intel Core i7-5775C




This is a side by side of the i7-5775C on the right and the i7-4790K on the left. Both CPUs work in LGA1150 socket motherboards, however the Z97 chipset is recommended for the Broadwell SKU and XMP is only supported on Z97.





The bottom of each CPU is a bit different, the SMDs are positioned differently. While the CPUs have an almost identical pin out, two pins, LGA Ball #s "K9" and "Y7" have changed. Previously Intel had the signal names, "FC_K9" and FC_K7" on pins "K9" and "Y7" for Haswell CPUs. Those two pins are now "VCCST" on pin "K9" and "VCCST_PWRGD" on pin "Y7" for Broadwell CPUs.


VCCST is the "sustain voltage for the processor in standby" as described by the Desktop 5th Gen. Intel Core Processor Family Datasheet. Power improvements have been made to Broadwell for very low power consumption standby modes. I assume that VCCST perhaps circumvents the FIVR, or provides only partial power to some specific area of the FIVR so that the entire FIVR doesn't need to be turned on.



Test Systems


For this article, I went back and retested four processors in addition to the 5775C, that means all the benchmarks run in this review have been done so with the same drivers, OS, and benchmark software versions. All LGA1150 CPUs were tested on the same motherboard.




Z97 motherboards have been on the market for a while now, but Broadwell will require a BIOS update. Some BIOSes will have new options for eDRAM overclocking. For this article, I used three motherboards, one X99 and two Z97. I used the ASRock X99-OC Formula/3.1 for the X99 results, the GIGABYTE Z97X-SOC Force to test all the LGA1150 CPUs at stock and at 4.0GHz, and the MSI Z97 Gaming 9 ACK for exploring overclocking.




For the benchmarks, I decided that out of the box performance was just as important as clock for clock performance. I decided to test all the CPUs at stock, but also at a 4GHz overclock with 2133MHz memory clock with the same timings. I was able to apply the same VCore of 1.27 to accommodate all the LGA1155/LGA1150 CPUs for the overclock to 4GHz, which helped standardize the power consumption results. I also set the Cache/Uncore ratio to 33x.

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