Info 64MB V-Cache on 5XXX Zen3 Average +15% in Games

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Kedas

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Dec 6, 2018
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Well we know now how they will bridge the long wait to Zen4 on AM5 Q4 2022.
Production start for V-cache is end this year so too early for Zen4 so this is certainly coming to AM4.
+15% Lisa said is "like an entire architectural generation"
 
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Forgive my ignorance, whats GDM ? and most of mine are single rank ? 8 gig sticks ?

Geardown Mode - allows the DRAM device to run off its internally-generated ½ rate clock for latching on the command or address buses.
ON is the default for speeds greater than DDR4-2667. However, the benefit of ON vs. OFF will vary from memory kit to memory kit. Enabling Geardown Mode will override your current command rate
 

Markfw

Moderator Emeritus, Elite Member
May 16, 2002
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I can't select specific text to italicize, wtf
On Ryzen, I have never heard of GDM, just the 1T/2T command rate. All of mine are verified at 1T. On my 12700F however, I was in 1T, but geardown mode over 3200 kicked in, and I had to lower it to 3200. It's a hard wall for Alder lake at 3200, but not for Ryzen, not sure the hard wall for them.
 
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On Ryzen, I have never heard of GDM, just the 1T/2T command rate. All of mine are verified at 1T. On my 12700F however, I was in 1T, but geardown mode over 3200 kicked in, and I had to lower it to 3200. It's a hard wall for Alder lake at 3200, but not for Ryzen, not sure the hard wall for them.

Here's a little more about Gear Down Mode, Timings, etc.


The highest I can run GDM disabled with my dual rank kit (2x16) is 1333:2666 with simple voltage changes, after that it's a huge mystery. The memory latency is huge at 1333 but input delay is extremely low. Latency is around 80ns @ 1333, with my current 1833:3666 speed memory latency is around 55ns

EDIT: my gaming rig's highest IF stable speed is 3733 (5800X)
 
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Markfw

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Here's a little more about Gear Down Mode, Timings, etc.


The highest I can run GDM disabled with my dual rank kit (2x16) is 1333:2666 with simple voltage changes, after that it's a huge mystery. The memory latency is huge at 1333 but input delay is extremely low. Latency is around 80ns @ 1333, with my current 1833:3666 speed memory latency is around 55ns

EDIT: my gaming rig's highest IF stable speed is 3733 (5800X)
Well, like I did with my Alder lake, I will have to do more testing. What is the easiest way to tell if its in gear down mode ???? I always thought CPUZ was king, but it did not show it for Alder lake, I had to run benchmarks. And after this ignore my comments that they all run 3800/1900. Thats only assuming GDM did not kick in..

Why is it, you can't just buy memory thats runs at a speed, and call it good ?

Just something that ticks me off.
 
Nov 26, 2005
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Well, like I did with my Alder lake, I will have to do more testing. What is the easiest way to tell if its in gear down mode ???? I always thought CPUZ was king, but it did not show it for Alder lake, I had to run benchmarks. And after this ignore my comments that they all run 3800/1900. Thats only assuming GDM did not kick in..

Why is it, you can't just buy memory thats runs at a speed, and call it good ?

Just something that ticks me off.

When I upgraded to Ryzen it took me a while before I learned about GDM. I spent 10+yrs with an X58 rig and never knew GDM was a thing, lol

Download Zen Timings to see your settings. It's pretty comprehensive. Here's a screen shot of mine.

1833 GDM Enabled 1T.jpg


EDIT: Also tells you the PCB DRAM revision, and the Rank at the bottom of the pic. A2 = PCB DRAM Revision, (16GB, DR)
 
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Markfw

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May 16, 2002
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When I upgraded to Ryzen it took me a while before I learned about GDM. I spent 10+yrs with an X58 rig and never knew GDM was a thing, lol

Download Zen Timings to see your settings. It's pretty comprehensive. Here's a screen shot of mine.

View attachment 58600


EDIT: Also tells you the PCB DRAM revision, and the Rank at the bottom of the pic. A2 = PCB DRAM Revision, (16GB, DR)
Problem... Most of my boxes are linux. Also, even if its enabled, is it currently being used (is it on) ????

Here is the box I am posting from, one of the few Windows boxes

1647222798326.png
 
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I don't game. How do I tell by software ?

On Linux I wouldn't know. I never looked to see if Zen Timings works on Linux, but with your Windows box Zen Timings says it's enabled. I highlighted mine in Red. Or you can use Ryzen Calculator 1.7.3 and look under the MEMBench tab and it'll list all your timings and GDM. I'd imagine doing a TM5 test you'll finish a cycle sooner with GDM Disabled 1T vs GDM Enabled 1T. My entire desktop responsiveness on my Dark Hero is much quicker/snappier when I run 1T GDM disabled, also.

Also your FCLK is 1800 while your MCLK and UCLK 1600. Did you set those that way or is that the XMP profile that's doing that?

Whoa! I just realized you're running 3200. Is VSOC @ 1.175v what 4x8 needs to run stable at that speed? Did you TM5 test it??
 

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lobz

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When AMD launches an SKU, how many units are we talking about? Thousands? Hundreds of thousands? Or in the millions?
It 100% depends on the type of the SKU itself and without information coming straight from the company, you could never tell - but that has nothing to do with AMD, it's the same with any vendor.
 

nicalandia

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Releasing on 04/20/20222 so in 5 days

1647353420346.png


1647353559906.png
 

nicalandia

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The world's Fastest gaming processor

 
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Panino Manino

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More than a month away, too late...
And the availability... I can already see only a few lucky ones getting one and all the negative reaction from all the others that waited so much for this thing, along with the collective disappointment at the performance.
There's no way this will be more than a curiosity at this point, right? Right?
 

nicalandia

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Jan 10, 2019
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More than a month away, too late...
And the availability... I can already see only a few lucky ones getting one and all the negative reaction from all the others that waited so much for this thing, along with the collective disappointment at the performance.
There's no way this will be more than a curiosity at this point, right? Right?
Since When having Zen3 can disappoint anyone? At gaming or otherwise?