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post #1 of 8 (permalink) Old 02-07-2019, 05:07 PM - Thread Starter
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9900K vs. 9900KF?

Time to replace my aging 3970X in my 2nd rig and wanted to build a Z390 system with a 9900K or 9900KF CPU.

The thing is, the "KF" is the one without the i-GPU so does that mean it can OC better? Or is there no real difference between the two? The "KF" is slightly more expensive but that's not an issue if it is a better CPU overall.

Also, what is the BEST motherboard for the Z390 platform? I don't care about price - I want highest OC with the fastest RAM (32GB) and will be using 2x 2080 Ti in SLI/NVLink.

TIA.
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post #2 of 8 (permalink) Old 02-07-2019, 05:11 PM
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Apparently the 9400F isn't soldered, so if that's true too with the 9900F I definitely wouldn't buy it.

And no, it doesn't OC better - just like the 2550K didn't OC any better than the 2500K.

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post #3 of 8 (permalink) Old 02-07-2019, 05:12 PM
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I think it still physically has the iGPU on board. They are just ones that had a bad iGPU during manufacturing so they disabled it.

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post #4 of 8 (permalink) Old 02-07-2019, 05:14 PM
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Quote: Originally Posted by Hydroplane View Post
I think it still physically has the iGPU on board. They are just ones that had a bad iGPU during manufacturing so they disabled it.

I thought the same thing, but at least with the 9400F the die is (?) smaller. It's wider but it's a lot shorter, it seems like they removed something.


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post #5 of 8 (permalink) Old 02-07-2019, 05:18 PM
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Quote: Originally Posted by Baasha View Post
Time to replace my aging 3970X in my 2nd rig and wanted to build a Z390 system with a 9900K or 9900KF CPU.

The thing is, the "KF" is the one without the i-GPU so does that mean it can OC better? Or is there no real difference between the two? The "KF" is slightly more expensive but that's not an issue if it is a better CPU overall.

Also, what is the BEST motherboard for the Z390 platform? I don't care about price - I want highest OC with the fastest RAM (32GB) and will be using 2x 2080 Ti in SLI/NVLink.

TIA.
So far nobody has found an actual advantage to the KF parts for the buyer unless they are offered for less money. They appear to be just K parts that had a defective iGPU so it's been deactivated.

We will need to see some overclocking comparisons to really know for sure, but due to the variations in the overclocking capabilities from one part to the next, it will probably take some sort of statistics gathering over many parts before we can see a trend (PassMark or Silicon Lottery perhaps).

Personally, I'd think the place they would fit best would be in a pre-made system (like say a Dell) that comes with a graphics card. Then, presumably, Intel would offer Dell some sort of discount for the F or KF parts vs. the K parts. If selling at the same price as the K, I don't know why anyone would buy the F or KF parts.

If the KF was actually a new chip layout with the iGPU physically removed and the CPU cores spaced out more and thus offered better cooling, then Intel might actually have a better part for overclockers who use an external GPU, but so far I haven't seen any sign that this is that.

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post #6 of 8 (permalink) Old 02-07-2019, 05:23 PM
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Quote: Originally Posted by Baasha View Post
Time to replace my aging 3970X in my 2nd rig and wanted to build a Z390 system with a 9900K or 9900KF CPU.

The thing is, the "KF" is the one without the i-GPU so does that mean it can OC better? Or is there no real difference between the two? The "KF" is slightly more expensive but that's not an issue if it is a better CPU overall.

Also, what is the BEST motherboard for the Z390 platform? I don't care about price - I want highest OC with the fastest RAM (32GB) and will be using 2x 2080 Ti in SLI/NVLink.

TIA.

'KF', post silicon lottery and unless binned differently, should give you a smidgen of extra headroom simply because of slightly lower temps, compared to iGPU not being completely cut off, but the difference may be so minor, it may be hard to tell. EVGA Dark Z390 seems to have the right kind of VRM and is seriously optimized for RAM OC (Buildzoid's review here
Spoiler!
but note that it only comes with 2x DDR4 slots (because it is optimized for RAM OC !). Other than that, Gigabyte Aorus Z390 seems to have quite a following...
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post #7 of 8 (permalink) Old 02-16-2019, 10:25 PM
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Quote: Originally Posted by jfriend00 View Post
So far nobody has found an actual advantage to the KF parts for the buyer unless they are offered for less money. They appear to be just K parts that had a defective iGPU so it's been deactivated.

We will need to see some overclocking comparisons to really know for sure, but due to the variations in the overclocking capabilities from one part to the next, it will probably take some sort of statistics gathering over many parts before we can see a trend (PassMark or Silicon Lottery perhaps).

Personally, I'd think the place they would fit best would be in a pre-made system (like say a Dell) that comes with a graphics card. Then, presumably, Intel would offer Dell some sort of discount for the F or KF parts vs. the K parts. If selling at the same price as the K, I don't know why anyone would buy the F or KF parts.

If the KF was actually a new chip layout with the iGPU physically removed and the CPU cores spaced out more and thus offered better cooling, then Intel might actually have a better part for overclockers who use an external GPU, but so far I haven't seen any sign that this is that.
If like 9400 images its not soldered (i through they just solder the top 9700-9900K, im wrong), it maybe have a chance of having thinner diffusion barrier which would made it much better to just delid and apply metal tim.
Clearly its not a new chip, its some kind of binning, but there surfaced also some news of the 9900KFC edition (no pun intended), it will be interesting to check what those chips really are and if they perform somewhat differently.

https://www.anandtech.com/show/13967...0kfc-processor
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post #8 of 8 (permalink) Old 02-17-2019, 12:54 AM
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There is no difference in overclocking with the KF.

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