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[Official] RYZEN 7 1800X | 1700X |1700 Owners Club & 4GHz+ Club - Page 482

post #4811 of 11477
Quote:
Originally Posted by gupsterg View Post
 
Quote:
Originally Posted by gtbtk View Post

Actually the ram frequency is half of what your kit says because it is double data rate memory. GPU-z Actually reports the actual frequency on the page that shows the timings

If the Ram is double data rate so 3200Mhz ram is actually running at 1600Mhz if you put it on an oscilloscope and the DF would be at 800Mhz
Quote:
The data fabric

The northbridge of Zeppelin is officially called as the data fabric (DF). The DF frequency is always linked to the operating frequency of the memory controller with a ratio of 1:2 (e.g. DDR4-2667 MEMCLK = 1333MHz DFICLK). This means that the memory speed will directly affect the data fabric performance as well. In some cases, it may appear that the performance of Zeppelin scales extremely well with the increased memory speed, however that is necessarily not the case.

In many of these cases the abnormally good scaling is caused by the higher data fabric clock (DFICLK) resulting from the higher memory speed, rather than the increased performance of the memory itself.

Quote from The Stilt.
Quote:
Originally Posted by kundica View Post

Ah. Thanks for the clarification!

No worries smile.gif .

Once I get to know more of UEFI options / how "Auto rules" work when som,something is changed I will be setting all manually as required.

For example I went 2400MHz with my 3.8GHz OC profile and SOC: [Auto] resulted in ~1.050V , where as 2133MHz SOC: [Auto] resulted in ~0.838V on DMM. As 2400MHz seems is not broken or within official RAM support for say 2x4GB SS RAM I have kept it SOC: 0.925V ~0.944V on DMM. SO far so good, plane to lower some more.

So I'm ready on experience for when my other RAM is back wink.gif .

I have a problem with that quote.

 

The Doco that I have read does say 1:2 of the memory frequency. I agree withg that part, however the operating frequency of DDR4 memory is not 2133/2400/2666/3200 that is written on the box. The 3200 is double data rate that runs on chips with an operating frequency of 1600Mhz chips.

 

Of course the AMD doco may not be accurate and the DF actually runs at the same frequency of the Ram which is 1/2 of the DDR4 data Rate

 

the CPU-Z attachment that I found in the thread (not mine) is DDR4 running at what you would see in the UEFI memory timings selector as 3500Mhz 

 


Edited by gtbtk - 3/19/17 at 10:13am
post #4812 of 11477
The Stilt does say "(effective)".
Quote:
Data fabric, memory controller = MEMCLK (effective) / 2.

The guy has:-

a) access to a lot of AMD tech info.
b) experience.

So my apolgies to you and mean no offence, but unless he told me he had made a mistake I trust his information.

I have not met him in person, but online have been communicating on aspects related to my "endeavours" ~2yrs and he has not steered me wrong, unless of course he has made which I have only seen once.
Edited by gupsterg - 3/19/17 at 10:23am
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post #4813 of 11477
Just trying some cpu overclock now.

Boots fine at 4ghz at 1.4v but cinebench errors out.

Don't really want to go above 1.4v.

Anything to try? I'm just using multipler at the minute.
post #4814 of 11477
Quote:
Originally Posted by SpecChum View Post

Just trying some cpu overclock now.

Boots fine at 4ghz at 1.4v but cinebench errors out.

Don't really want to go above 1.4v.

Anything to try? I'm just using multipler at the minute.

As you have C6H with voltage points I would use a DMM to check VCORE under load. I know with what I thought was 1.381V via bios settings was 1.465V on DMM.

So I opted for lower 24/7 use OC.
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post #4815 of 11477
Quote:
Originally Posted by gtbtk View Post

I have a problem with that quote.

The Doco that I have read does say 1:2 of the memory frequency. I agree withg that part, however the operating frequency of DDR4 memory is not 2133/2400/2666/3200 that is written on the box. The 3200 is double data rate that runs on chips with an operating frequency of 1600Mhz chips.

Of course the AMD doco may not be accurate and the DF actually runs at the same frequency of the Ram which is 1/2 of the DDR4 data Rate

the CPU-Z attachment that I found in the thread (not mine) is DDR4 running at what you would see in the UEFI memory timings selector as 3500Mhz 



Pretty sure The Stilt said Data Fabric = North Bridge and therefor, as you can see in the CPUZ pic you posted, DRAM Freq = DF Freq (1:1).

edit: I think the 2:1 ratio quote actually came from the fact of Double Data Rate
Edited by f1LL - 3/19/17 at 10:22am
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post #4816 of 11477
Quote:
Originally Posted by gtbtk View Post

Why would you post that opinion in the owners club thread?

Because only the owners can tell if there are a lot of bugs.
post #4817 of 11477
Seems like my 1700 is a dud.. Oh well mad.gif
post #4818 of 11477
Quote:
Originally Posted by GreedyMuffin View Post

Seems like my 1700 is a dud.. Oh well mad.gif

Why????
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post #4819 of 11477
Quote:
Originally Posted by yoyo711 View Post

Why????

Does not overclock good..

Will test more once I receive my 1080Ti and WB since I have not put it under water yet. Did not want to assemble my custom loop just to disassemble it a few days later. tongue.gif
post #4820 of 11477
Quote:
Originally Posted by GreedyMuffin View Post

Does not overclock good..

Will test more once I receive my 1080Ti and WB since I have not put it under water yet. Did not want to assemble my custom loop just to disassemble it a few days later. tongue.gif

My 1700 is just 3925Mhz with 1.44Vcore and LLC-4 (not so good)

Temps are 70ºC Full Load and is stable 24h handbrake and cinebench. (Corsair h115i)

The thing I want to OC now is the memory to at least 3500MT and CL14. Seems that the board has some issues whebn POSTing at those frequencies but when it does POST (after 1 or 2 resets of 9F--->0D), it is stable.

Memory at 3200Mhz 14-14-14-34 is rock solid.
Edited by Frikencio - 3/19/17 at 11:05am
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