Discussion Zen 5 Speculation (EPYC Turin and Strix Point/Granite Ridge - Ryzen 9000)

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Abwx

Lifer
Apr 2, 2011
11,517
4,303
136
Prove it, otherwise. . .




You re just repeating what i said, so how should i prove it otherwise, didnt i say that if clocks are low enough there will be no time violation..??

It can occur if the signal comes too early but in this case it s only if the clock is too high and as a consequence that there s not enough time for the stage to be triggered during the relevant clock cycle as to hold the desired value.

So assuming that frequency is low enough at the start there will be no time violation by other mean than the transistors not switching fast enough, that is, too low transconductance to charge parasistic capacitances in due time, i.e, signal being too late as a result.


So read first what is said, since you re now trying to make a point out of something you once negated a few post above, your quote is saying exactly what i stated in my post that i just quoted above.

Anyway, at least i got a good pile of lols for free.
 

Hitman928

Diamond Member
Apr 15, 2012
6,057
10,388
136
You re just repeating what i said, so how should i prove it otherwise, didnt i say that if clocks are low enough there will be no time violation..??




So read first what is said, since you re now trying to make a point out of something you once negated a few post above, your quote is saying exactly what i stated in my post that i just quoted above.

Anyway, at least i got a good pile of lols for free.

Read it again, it agrees with me.
 

Abwx

Lifer
Apr 2, 2011
11,517
4,303
136
Read it again, it agrees with me.
Here the quote you posted :

Hold violation happen when data is too fast compared to the clock speed. For fixing the hold violation, delay should be increased in the data path.

And here what i said before you posted this quote :
The pudding interior say that time violation occur mainly when the data signal is too late.

It can occur if the signal comes too early but in this case it s only if the clock is too high and as a consequence that there s not enough time for the stage to be triggered during the relevant clock cycle as to hold the desired value

So what you quoted is just the same thing as what i said, and the contrary to what you said in your first posts on the subject.

Edit : The data signal state will last as long as the clock signal doesnt change state, if the clock signal is of low enough frequency the data signal will have all necessary time to trigger the driven stage.
 
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Hitman928

Diamond Member
Apr 15, 2012
6,057
10,388
136
Here the quote you posted :



And here what i said before you posted this quote :


So what you quoted is just the same thing as what i said, and the contrary to what you said in your first posts on the subject.

Edit : The data signal state will last as long as the clock signal doesnt change state, if the clock signal is of low enough frequency the data signal will have all necessary time to trigger the driven stage.

Nope, try again. As the quote says, you cannot fix a hold violation post fabrication. Clocks, making them faster or slower, have nothing to do with it.
 

mostwanted002

Member
Jun 16, 2023
33
66
61
mostwanted002.page
Arrow Lake Leak got somebody excited enough to tune up a 9950X on Geekbench. Multiple different runs of 5950 MHz all core OC today, probably DI or LN2



View attachment 103765
Is it a geekbench issue that it says "Memory Channels : 4"?

 

Markfw

Moderator Emeritus, Elite Member
May 16, 2002
26,065
15,200
136
So who wants to be guinea pig and buy a CPU from the first batch now, unless AMD discloses what the actual problem was and how well it could be fixed?
Me. Its not a problem. READ. Its a QA issue. In other words, allowing a 9950x to be sold at under the advertised MHZ or the like.

Worse case, allowing a 9950x to be sold that does not meet QA and at top frequency, is not stable. Sound familiar ?
 

Fjodor2001

Diamond Member
Feb 6, 2010
3,989
440
126
Me. Its not a problem. READ. Its a QA issue. In other words, allowing a 9950x to be sold at under the advertised MHZ or the like.

Worse case, allowing a 9950x to be sold that does not meet QA and at top frequency, is not stable. Sound familiar ?
Reading the other posts in this thread, it does not seem to be clear what exactly the reason for the delay is. QA could mean lots of things. How come you think it’s likely a frequency only issue?
 
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Doug S

Platinum Member
Feb 8, 2020
2,710
4,597
136
Edit: If it was an actual issue with the chips, there's no chance they would be able to get them fixed and new ones out the door within a week or two. It would have to be either the QA testing miss as explained, or something wrong with the microcode/firmware that they could fix and push out quickly.

They could easily fix a hardware issue within a week or two. Just look at Intel, they didn't need a respin they're able to solve it with a firmware update (at least to the extent of preventing future degradation, they can't undo potential past degradation)

AMD could have looked at Intel's troubles, done some internal reviews "are we vulnerable to the same sorts of problems", found they were, and are making changes to insure voltage levels are kept within bounds to prevent similar issues. By recalling before release they avoid the risk of having chips out there that are operating "unfixed" for months/years by the sort of people who never update their firmware.

Now I have no idea what AMD's problem really is, but the timing of this given Intel's announcement seems a little suspicious to me. A couple week delay to cut the possibility of such issues off at the pass would be well worth it, if it means being able to sit back with a smug grin on your face while Intel deals with the fallout for their problems for the next year or two.
 
Jul 27, 2020
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These companies are packed with talented and highly professional people, yet things go wrong from time to time. This (Zen 4/RPC) gen should be very indicative of that.
These talented and highly professional people don't get it in their heads to do crazy or stupid things on the CPUs. That's how they got their job in the first place. Usually someone wanting to monkey about with things isn't tolerated at most workplaces around the world.
 
Jul 27, 2020
19,613
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It’s good that AMD found this issue before launch. But as I finding this issue this close to launch is a bit concerning. AMD should have done tested all scenarios and not skipped on some.
Maybe some smartass in the art department drew a really tiny doodle on the Zen 5 IHS and one or some of the reviewers discovered it while examining the IHS with magnification. And it's probably NSFW.
 

FlanK3r

Senior member
Sep 15, 2009
320
82
101
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gaav87

Member
Apr 27, 2024
117
154
76
If anyone is interested here are some answers from the 9900x italian guy. Full answer on YT. The tests were done with 2:1 but he managed to boot into windows with 3600uclk 2400IF.
Is 3600 uclk real with proper tunning ? (i dont own zen4 does it even turn on with 3600uclk and 2400IF ?)
 

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Philste

Senior member
Oct 13, 2023
251
444
96
Some Bits from Computerbase:

-nobody had review samples, so nobody can tell if the SKUs are really taken back and switched out
-AMD knew about a problem for weeks, so they put 31th as release and tried fixing it until then.
-AMD specifically told the press on AMD Tech day over 2 weeks ago that supply of Ryzen 9 SKUs will be (extremely) tight.
-with these info, Computerbase Editor definitely thinks what AMD said to the Verge isn't the truth.
-However, he doesn't know the real reason

Overall it makes me think my Yield Theory gets increasingly more likely. There must be something different for the big SKUs and the only real difference is higher boost clocks.
 

exquisitechar

Senior member
Apr 18, 2017
682
939
136
Some Bits from Computerbase:

-nobody had review samples, so nobody can tell if the SKUs are really taken back and switched out
-AMD knew about a problem for weeks, so they put 31th as release and tried fixing it until then.
-AMD specifically told the press on AMD Tech day over 2 weeks ago that supply of Ryzen 9 SKUs will be (extremely) tight.
-with these info, Computerbase Editor definitely thinks what AMD said to the Verge isn't the truth.
-However, he doesn't know the real reason

Overall it makes me think my Yield Theory gets increasingly more likely. There must be something different for the big SKUs and the only real difference is higher boost clocks.
Source is forum posts or what?
 
Reactions: Tlh97 and coercitiv

CakeMonster

Golden Member
Nov 22, 2012
1,493
653
136
HUB talked about this a day or two before the news broke, Steve was waiting for a package with the CPU's but there was radio silence about when it would ship or arrive, and they were quite overdue compared to earlier launches that had a fixed date.
 

MS_AT

Senior member
Jul 15, 2024
210
502
96
Some Bits from Computerbase:

-nobody had review samples, so nobody can tell if the SKUs are really taken back and switched out
-AMD knew about a problem for weeks, so they put 31th as release and tried fixing it until then.
-AMD specifically told the press on AMD Tech day over 2 weeks ago that supply of Ryzen 9 SKUs will be (extremely) tight.
-with these info, Computerbase Editor definitely thinks what AMD said to the Verge isn't the truth.
-However, he doesn't know the real reason

Overall it makes me think my Yield Theory gets increasingly more likely. There must be something different for the big SKUs and the only real difference is higher boost clocks.
Tight for 9950X only or both 9900X and 9950X?
 
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