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Challenger
Challenger

All-Core clockspeed of the 3800XT revealed

Some of us already have the 3800XT but are not gagged by any AMD NDA, and I am one of those people.

How can that be you ask?

The answer is that I have the 3950X which consists of two upper quality range eight core 3rd Gen Chiplets.

So to find out how high the "new" 3800XT will clock, all I have to do is disable one CCD, and hey presto, instant 3800XT.

Although this is obvious, it seems to have eluded the Tech-Media and so-called "Tech-Tubers", who have shown themselves, even after almost a year, to be incapable of adequately configuring the 3rd Gen Ryzen CPUs - either through laziness or stupidity - even though they get their stuff from AMD for free and I have to pay retail.

Doing the experiment of disabling one CCD on my 3950X I can run my virtual 3800XT at an all-core frequency of 4.5 GHz and run CineBench R20 (so it is a stable clock).

There is however a small problem. With a Ryzen 3rd Gen CPU you cannot set it to more than 4.225 GHz or so (might vary with some motherboards) in the BIOS without Windows 10 being corrupted at boot.

At first I thought it was my motherboard that was having this problem; however in a video JayzTwoCents stated that he couldn't get any of the 3rd Gen Ryzen CPUs to boot into Windows 10 when he set the clockspeed above 4.225 GHz or so in the BIOS.

There is a way around this and to run your shiny new 3800XT to run at 4.5 GHz and I explained my methodology as a step by step guide in the post:

https://community.amd.com/thread/249957 

If you try to configure the 3800XT in any other way, then you will be lucky to get 4.05 GHz or so out of it running an all-core load like CineBench R20.

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13 Replies
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Exemplar
Exemplar

Re: All-Core clockspeed of the 3800XT revealed

i dont think so
afaik the new XTs will have a refined process

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Challenger
Challenger

Re: All-Core clockspeed of the 3800XT revealed

If this were true - which it isn't - how would you account for no 3950XT?

It is plain and simply that the yield of high quality chiplets is a lot higher (which one would expect as a node matures) and instead of "wasting" them the existing product line, AMD has just invented a new SKU and upped the price.

I am not saying that as a criticism of AMD, it's just good business - to an extent.

I am however very much perturbed that AMD seems to be going the Intel route and having the Salescritters/Marketdroids running the show and nudging out the guys who actually work for a living, namely the engineers, in the corporate hierarchy.

Perhaps the powers that be should read the book "The Peter Principle".

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Challenger
Challenger

Re: All-Core clockspeed of the 3800XT revealed

Another thing to consider is that if there were differences to the current series of CPUs then there would have to be an AGESA update and concomitant to this a new BIOS update from the mobo manufacturer.

Neither is the case.

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Exemplar
Exemplar

Re: All-Core clockspeed of the 3800XT revealed

mh, i think we two missed eachother here.

i mean it is a refined production process - with less errors.
this will increase ability for higher clocks

you mean a new production process - with new layout etc
that will increase IPC etc

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Challenger
Challenger

Re: All-Core clockspeed of the 3800XT revealed

That doesn't make sense to me, simply because AMD is bringing out the 4000 series CPUs and the new RDNA2 Navi GPUs and also the Console APUs on the refined processes.

Occam's Razor would dictate that the CPUs are being made on the same process but just that they will be better binned as the node has matured.

Speaking of Occam's Razor, I prefer Hanlon's Razor which states, "Never attribute to malice that which can adequately be explained by stupidity".

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Exemplar
Exemplar

Re: All-Core clockspeed of the 3800XT revealed

mh - lets say we meet in between "more matured process" will increase yield of high-quality chips

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Adept III
Adept III

Re: All-Core clockspeed of the 3800XT revealed

So, would Zen+ be considered a refined process or a new process for CPU's

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Challenger
Challenger

Re: All-Core clockspeed of the 3800XT revealed

They moved to a new node for Zen+ albeit it was not such a big jump as it was to Zen2 (3rd Gen Ryzen).

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Adept III
Adept III

Re: All-Core clockspeed of the 3800XT revealed

Alright, so what iteration of zen is my Ryzen 5 APU

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