Upcoming Core i7-9700K Overclocked to 5.3GHz on Air
Intel’s 9th Generation Core desktop CPUs may not have been formally announced yet, but at this point, they’re the worst-kept secret in the semiconductor industry. We know these chips will target higher clocks and that at least some of the SKUs will use solder instead of thermal paste. It is not currently clear, based on the leaked slides, whether all of the desktop Core i5 / i7 / i9 CPUs in the family will use solder or whether this is reserved for the Core i9-9900K. Early data from the i7-9700K, however, suggests it may be common to the family.
According to leaked information from Expreview, the Core i7-9700K can be overclocked to 5.3GHz on air using what’s apparently an entry-level cooler from Kyushu Fengshen Xuanbing 400. We don’t know the fan RPM, but the overall design of the cooler recalls basic models you can buy from companies like CoolerMaster.
An attached screenshot claims a multiplier of 53x with a relatively low core voltage (1.25v). The chip in question is clearly an engineering sample, and we don’t know how stable the OC was. My own standards for whether a CPU is stable when overclocked are extremely high. I don’t personally consider an overclock to be stable until and unless the CPU has demonstrated that there is literally no difference in stability between the OC’d chip and the stock chip. I don’t care if your CPU runs 99 tests perfectly and fails the 100th. If it isn’t stable in all 100, it isn’t a stable overclock. That’s somewhat different from the typical mentality of the competitive overclocking scene, which is one reason I don’t get invited to the really cool liquid helium parties.
Hitting 5.3GHz on air is a real achievement, but WCCFTech notes that other leaked chips have been hitting 5.5GHz with water cooling and a CPU voltage of 1.536 volts. I mention this not because 5.5GHz on water is a bad achievement — it absolutely isn’t — but 1.536v is an insane amount of voltage to pump through a CPU. By contrast, 5.3GHz on 1.25v with an entry-level cooler is a very good result. What this means, in aggregate, is that we don’t actually know much about how much headroom these cores will practically have. The 5.5GHz chip could be a bad overclocker, while the 1.25v CPU @ 5.3GHz might represent a semi-mythical “golden sample.” Said samples aren’t actually mythical but your chances of acquiring one are as bad as you think they are. The actual amount of improvement compared to a standard CPU or GPU always varies depending on the particulars of the manufacturing process and the characteristics of the product in question.
But the implication of these results, at least, is that Intel’s decision to move to solder could pay some modest dividends for enthusiasts and overclockers when these cores launch later this year. Overall performance on the 9700K is also said to be better than the 8700K, even at stock, which should help make them an overall upgrade — though the 8700K is an excellent chip in its own right and unlikely to drive much in the way of an upgrade cycle. We’d expect most buyers to come from customers using Skylake or older CPU cores.
Don’t expect solder to fundamentally change the physics of CPU scaling, however. Even if Intel’s manufacturing tweaks move the bar outwards by a few hundred MHz, just using solder between an IHS and die won’t magically make silicon scale more effectively above 5GHz. Enthusiasts may be able to scale their CPUs higher by 5-8 percent, but Intel won’t be riding this change to another GHz of clock — or even another 500MHz.
Now Read: Intel Reportedly Won’t Deploy EUV Until 2020, Core i9-9900K May Use Solder, Not Thermal Paste, and Intel is at a Crossroads