Intel's Core i9-9900KF May Overclock Better Than 9900K

Welcome to the Intel Core i9-9900KF. No, that is not a typo. The eight-core 16-thread i9-9900KF is one of the newest mainstream processors from Team Intel. According to the vendor, the only difference between the “K” and “KF” model is that the latter does not have a functioning internal graphics processing unit (iGPU).

The KF chips, which are only available for pre-order, are likely meant to help Intel deal with its production shortages. How else do you explain that the chip goes from around the same price as the Intel Core-9900K, but has one fewer feature?

I am an competitive overclocker. I am not an engineer by any means. That being said, I am limited mostly to trial and error as my main source of information. This can be quite time-consuming, but incredibly valuable! It is the exact opposite of much of the traditional information available online, and in some regards it provides a better personal understanding of what is really going on. There are so many knobs and dials in the BIOS to tweak to perfection and create the harmonious symphony that is a stable overclock. So how does this relate to the 9900KF versus the 9900K? We’ll get there, hold on.

Luckily, I have access to processors and a really awesome team that contributes immensely, which paid off recently when I received 200 i9-9900K processors. What do you do with 200 i9-9900K processors? Well, you sort them one by one. This process is called binning. The secret to great liquid nitrogen (LN2) results is to first “bin” a great processor, and that process begins with testing on standard air cooling.

Out of 200 tested 9900Ks, here are the results of binning out the top 23 chips. Nineteen of the processors could do 5.3 GHz during a Cinebench R15 test with normal water cooling, but none could do 5.4 GHz. Out of a much smaller sample size of just five 9900KF processors, one of them does 5.4 GHz! It actually completes three-quarters of an R15 benchmark at 5.5 GHz on normal cooling, which is miles above any of the 9900Ks.

Now, the intelligent readers are thinking to themselves, this doesn’t mean anything. Even 200 CPUs is such a small percentage of all CPUs produced, it’s like making the statement that Earth is covered in ice because that’s all you can see if you’re standing at the North Pole. Well, you aren’t wrong, but this is what we have, so it’s what we will work with. The greater the sample size, the more accurate we can gauge the quality. Yes, 200 chips is small in the grand scheme of things, but I don’t think you will see too many people that have tested more CPUs with extensive documentation like this.

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Max Passable Freq Water Cooled
Model	Volts	Frequency	Max Temp
9900K	1.38	5300	96
9900K	1.39	5300	90
9900K	1.31	5200	78
9900K	1.32	5300	92
9900K	1.32	5200	81
9900K	1.34	5300	78
9900K	1.34	5300	78
9900K	1.38	5300	78
9900K	1.34	5300	78
9900K	1.31	5300	78
9900K	1.33	5200	80
9900K	1.36	5300	84
9900K	1.38	5300	90
9900K	1.37	5300	90
9900K	1.3	5200	74
9900K	1.4	5300	95
9900K	1.36	5300	83
9900K	1.29	5200	73
9900K	1.41	5200	96
9900K	1.31	5300	81
9900K	1.29	5300	78
9900K	1.34	5300	79
9900K	1.3	5300	71
9900KF	1.32	5400	73
9900KF	1.35	5300	77
9900KF	1.37	5300	82
9900KF	1.35	5300	75

Some CPUs even run 10 degrees Celsius warmer at the same voltage. We are looking for low load temperature in combination with low voltage while maintaining a high clock speed. This will give us the best chance to use a lot of voltage, yet keep the chip cooler with LN2. A very poor-scaling CPU can be excellent on air/water cooling, but be average to poor on LN2. It actually happens quite often and is a real pain, but it’s quite a rush when you do find a chip that does scale well.

Next I took the 5.4 GHz 9900KF, mounted my LN2 pot on it and away we went. It scaled beautifully and ran nice and cool. With a -193 degrees Celsius container temperature at idle, the CPU can only increase that to -187 degrees Celsius with a massive 1.73 volts being jammed into it. This resulted in a 6.95 GHz R15 run, which is 75 MHz higher than my best run with a standard i9-9900K with LN2 cooling. It was a thrill to be the first person in the world to bench a 9900KF on LN2, so naturally it was a first place score for 9900KFs at the time I did it.

Analyzing all of this info leads to a few theories. Could the 9900KF's have a refined, higher-quality silicon? Intel did similarly with its Engineering Sample (ES) 9900Ks versus retail chips. Retail 9900K CPUs are clocking much better on average than their ES counterparts. I have purchased three retail 9900K CPUs, and unless I'm the luckiest man in the world (I actually am but for other reasons), they were all 6.8 GHz+ chips on LN2. I've tried plenty of ES CPUs that maxed at 6.6 - 6.7 GHz (see above).

Folks, these are theories. I don’t work for Intel. I’m not a shareholder and I don’t have a dog in this fight beyond clawing for every ounce of performance and clocks I can get. If you already own a nice 9900K, should you go out and buy a 9900KF? Probably not, unless you are into overclocking and are displeased with your K-model. If you are in the market to upgrade and are into overclocking, then I would definitely suggest trying the 9900KF if you can find one for sale.

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A world-champion competitive overclocker who frequently tops the charts at HWBot, a site which tracks speed records, Allen will do just about anything to push a CPU to its limits. He shares his insights into the latest processors with Tom’s Hardware readers from a hardcore, push-it-to-the-limit overclocker’s perspective.

R15 Binning