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post #1 of 7 (permalink) Old 01-22-2019, 12:24 AM - Thread Starter
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refresh X299

Hello,

Just looking at the new intel chips - regarding the 12 core the outgoing model os 7920 X @ 2.9 Ghz whilst the new model is the 9920 X @ 3.5 Ghz -

Apart from the slightly faster clock speeds, is everything else the same? - or put another way if the 7920X was clocked to 3.5 Ghz would the performance be identical?

Always confusing with new CPU's - Is there anything new here?
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post #2 of 7 (permalink) Old 01-22-2019, 07:53 AM
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Yes they are very similar and will perform nearly identically at the same clock speeds.

Biggest differences with the 99xx series vs the 79xx (and 78xx) is the use of soldered heat spreader instead of thermal paste, moderate base and boost clock increases, and some CPUs have increases in L3 cache size. Also all CPUs have increased TDP to 165W.

The lower core count CPUs see the most changes and also more confusing numbering. The 6-core CPU is gone (i7 7800x), the 8-core CPU is now the i7 9800x (8-core was previously the i7 7820x) and has a full 44 PCIE lanes through the CPU, and there are two 10-core CPUs (i9 9820x and 9900x). 9820x is basically the same specs as the former 7900x, but with soldered heat spreader and slightly lower price. 9900x is also not that much different than either, just higher L3 cache at the old 7900x MSRP.

As seems typical for Intel this generation the naming and numbering is pretty confusing. I love how the 9900k is an i9 but the 9800x (same core count with more PCIE lanes and on HEDT platform) is an i7... Also the 7820x was an 8 core but the 9820x is a 10 core... They could've fixed this at the refresh and had 9908x, 9910x, 9912x, etc.

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post #3 of 7 (permalink) Old 01-22-2019, 08:06 AM
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Have you considered going with Threadripper instead?

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post #4 of 7 (permalink) Old 01-23-2019, 01:01 AM - Thread Starter
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Yes I had a look at the Intel website - The newer refresh X299's CPU's have smart cache which helps improve single threaded performance.

With the CPU's having more cores, for example the 7960 X with 16 cores, these produce more heat - The stock frequency is at 2.8 Ghz - Would it be possible to overclock to 3.6 Ghz - without major BIOS adjustments? - and without suffering thermal issues on a reasonable air cooler?

I've not used the mega-multi core CPU's yet but can see the multi-threaded advantage at some point when it's needed.

So a 7960X overclocked to 3.6 Ghz would offer some considerable performance over the 2.8 Ghz base clock? - What would be the maximum overclock without running into any difficulties on air cooling?

I'm not interested in overclocking for the sake of it and I'm not after any records but am interested in performance improvement for every day use if and when it's needed.

Any useful tips !!! -Thanks
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post #5 of 7 (permalink) Old 01-24-2019, 07:06 AM
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Quote: Originally Posted by fra z View Post
Yes I had a look at the Intel website - The newer refresh X299's CPU's have smart cache which helps improve single threaded performance.

With the CPU's having more cores, for example the 7960 X with 16 cores, these produce more heat - The stock frequency is at 2.8 Ghz - Would it be possible to overclock to 3.6 Ghz - without major BIOS adjustments? - and without suffering thermal issues on a reasonable air cooler?
Are you asking about the refresh CPUs or the original Skylake-X CPUs? I assume you mean the 16-core 9960X,which runs at 3.1 GHz base. You need to specify what kind of overclock you are looking for: all cores, 1-2 cores, what AVX/AVX512 offset, etc. Most of these CPUs should be able to hit 3.6 GHz all core pretty easily, but it depends on your cooling, your specific CPU (silicon lottery), and your motherboard.

If you're talking about boosting up to 3.6 GHz on one or two cores, well yes these CPUs will do that and a bit better out of the box. I believe all have default boost up to 4.4 or 4.5 GHz for one core if you use Intel's Turbo Boost Max 3.0.

In terms of minimal bios adjustments, that depends on the specific motherboard you go with. Just don't expect to go too far on this platform without incrementally testing and tweaking your settings. If you just set your multiplier in bios and leave everything else on auto, you will probably have cooling issues unless you have a really overkill setup. On air you're going to have to start at stock speeds, large AVX offsets, low voltages and gradually work your way up.

Quote: Originally Posted by fra z View Post
So a 7960X overclocked to 3.6 Ghz would offer some considerable performance over the 2.8 Ghz base clock? - What would be the maximum overclock without running into any difficulties on air cooling?
Yes you'll gain performance. How valuable that is to you is really dependent on what uses/workloads you're planning for. With overclocking you'll potentially draw more power, create more heat, need more cooling, etc... it's a bit of a loop and you need to find your own sweet spot. I will also say that an air cooler will likely not take you very far on this platform, especially with the 12-core and higher CPUs. Unless you're able to get by with very low voltages, modest all-core overclocks can easily see 350W+ power draw, which air coolers just can't handle well.

Check out the Skylake-X / Kabylake-X thread in this subforum. There's a lot of good info in there.

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post #6 of 7 (permalink) Old 02-02-2019, 03:32 AM
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Hi,
Little more here
JustinThyme got a good one
https://rog.asus.com/forum/showthrea...esh-OC-results

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post #7 of 7 (permalink) Old 02-02-2019, 04:13 AM
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Quote: Originally Posted by fra z View Post
Yes I had a look at the Intel website - The newer refresh X299's CPU's have smart cache which helps improve single threaded performance.

With the CPU's having more cores, for example the 7960 X with 16 cores, these produce more heat - The stock frequency is at 2.8 Ghz - Would it be possible to overclock to 3.6 Ghz - without major BIOS adjustments? - and without suffering thermal issues on a reasonable air cooler?

I've not used the mega-multi core CPU's yet but can see the multi-threaded advantage at some point when it's needed.

So a 7960X overclocked to 3.6 Ghz would offer some considerable performance over the 2.8 Ghz base clock? - What would be the maximum overclock without running into any difficulties on air cooling?

I'm not interested in overclocking for the sake of it and I'm not after any records but am interested in performance improvement for every day use if and when it's needed.

Any useful tips !!! -Thanks
You could probably go for 4 GHz on a 9960X with a good air cooling and reasonable temps. Frequencies above that, the power consumption increases exponentially. I own 7980XE but if I was in a similar use case as yours I might look at 2950X. Comparable performance, almost half the price. It would hit about 4.0-4.2 under air (due to lower power consumption) and might actually perform better. Skylake-X's big advantage over TR is higher clocks available, but that also comes with frightening heat and power consumption, and not really available on air.

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