Today's Hard|Forum Post
Today's Hard|Forum Post

Core i7-7700K - Kaby Lake & Corsair RAM Overclocking

We were lucky enough to get our hands on a new set of Corsair Vengeance LPX 3600MHz RAM this week and we immediately put it work with the new Intel Kaby Lake Core i7-7700K processor that is to be launched next month.

Corsair Vengeance LPX 3600MHz RAM

We showed our readers on Monday of this week that we got in some new Corsair Vengeance LPX DIMMs, part number, CMK32GX4M4B3600C18, with a 4 x 8GB footprint. These DIMMs are rated at 3600MHz.

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I got the RAM into a yet-to-be launched motherboard quickly to see what it could do.

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I set the Core i7-7700K to run at 4.5GHz and I used the XMP settings on the RAM which sets the clock to 3600MHz and the timings at 18-19-19-39-2T. The system booted right up and to the desktop without issue. This is not always what we have seen with Skylake processors in the past. In fact, Skylake gets downright tricky to tweak properly to get highly overclocked RAM settings with above 4.2GHz or so in mine and Dan's experience.

As you can see above, I loaded up Prime95 with it set to reach into almost the entire 32GB footprint. Prime95 easily ran for about a day and a half. Note: I had to edit the picture above, as I took the screenshot and then turned off the system before I realized that I left the CPU-Z windows with the clock and timing data behind the Resource Monitor window. The 7700K core voltage was running under 1.23v under full Prime95 load. The core voltage shown above is at idle.

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After that I moved onto doing some RAM abuse with Memtest. The first three times I ran Memtest with the DIMMs, the test failed. It would just lock up the system. The stock RAM voltage listed in the BIOS was 1.36v. I bumped it by five hundredths to 1.41v. Going back and running Memtest again proved successful. The screenshot above shows it into its second iteration of the test.

The Bottom Line

RAM overclocking is looking to be very good on Kaby Lake. I cannot get this particular 7700K CPU I am using here today to be full-load stable at 5GHz, so it is not what I think to be a "good" example of Kaby Lake overclocking, although the jury is still out on how many retail Kaby Lake CPUs will be capable of that. One thing is for certain though, this example of RAM overclocking on Kaby Lake is looking to be much more robust than what we have seen on all of the Skylake processors we have had experience with. It is quite possible that we are seeing the Kaby Lake architecture having a much better IMC (Integrated Memory Controller).

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