Broadwell i7 5775C good product or dead on arrival?

A Review On: Intel Broadwell Core i7-5775C 3.3 4 NA BX80658i75775C

Intel Broadwell Core i7-5775C 3.3 4 NA BX80658i75775C

Rated # 52 in CPUs / Processors
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TwilightRavens
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Pros: Runs extremely cool and quite fast considering it doesn't reach as high of overclocks as a 4790k and the likes.

Cons: Doesn't overclock as high as others, L3 cache is gimped to 6MB, does .[U]NOT[/U] like high speed RAM

So as we all know it, Intel’s Z97 platform was wildly successful as it offered Nehalem and Sandy Bridge owners a decent upgrade. Haswell in its self was a beast but today we are going to talk about a lesser known chip, Broadwell. Broadwell-DT is the platform no one actually wanted but Intel fit its launch in just 3 months before the release of Skylake. It featured only 2 socketed models , the i5 5675C and the i7 5775C. Today we are going to be focusing on the i7 5775C. I'll review it by granting you my personal experience of overclocking it.


Firstly, take everything you know about overclocking Haswell and chunk it out the window. Broadwell is a separate beast to be tamed. Remember how high clocks on the 4790k were fairly easy? This is not the case with Broadwell at all. Stock clocks are just 3.3GHz compared to 4.0GHz on the 4790k. But that’s okay because Broadwell even with its lower headroom and better efficiency is more powerful in the end.

Okay so maybe I lied about taking everything you know and chunking it out the window, as with previous generations core clock is king. With a good chip you should hit 4.2GHz at around 1.250v (I happened to get a very good chip with it stable at 4.2GHz with just 1.235v) A bad chip will take around 1.3v or so to stabilize at those clocks (I've binned quite a few of them over the past 2 years and this is by far the best one I've seen.) A lot of people say you won’t get higher than that. That is not true, if you are willing to pour the voltage into it you can hit 5GHz albeit at around 1.5v.

Cache is extremely sensitive to voltage and speeds compared to Haswell, where as you could run your cache ratio almost 1:1 with Haswell I can guarantee that you will not with Broadwell. With 1.250v in cache 4.0GHz was barely stable and the chip was near thermonuclear in temperatures, but that okay because 3.7GHz is really more than enough and actually does not provide much benefit over stock and i have yet to have a memory bottleneck.

The unique thing about Broadwell is its inclusion of EDRAM on its die or also called L4 Cache, Overclocking that over 2000MHz will actually reduce performance so its best to leave it stock and save that for last.

Ram is a different beast on Broadwell, it still confuses me completely because sometimes you can get a kit working at 2200MHz (DDR3) other times it won’t post if the speed is anything over 1866MHz (this is the same exact kit) so it appears that it is very cache clock and voltage sensitive.

Basically if you have an i5 4690k and you are not sure if you want to get a i7 4790K the 5775C would be a very smart choice, now if you already have a 4790K this would offer little to no performance increase unless you got a really bad chip for overclocking. Anyway I hope this review helps anyone on the fence about buying it or just need help with overclocking it.

1 Comment:

best gaming cpu on the planet still.