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*** AMD "Zen 4" thread (inc AM5/APU discussion) ***

alec said:
I believe it was shown that running memclk:IF in 3:2 is better for latency.
Could you compare these settings against IF@2067?
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Latency is improved at anything over 2000FCLK (very little improvement as I only tested default settings so far and not dialed in any Ram setting to improve latency)
Rough numbers so far 5600MT around 71ns 2000FCLK
6200MT at 2200FCLK varies 65ns-69ns These were only using AIDA6 and I do not think very accurate.

To tackle Ram takes weeks to get it stable at good timings,so I will be testing soon but can not give any of my real numbers yet.

Since I bought the AMD AM5 a few days ago I have not had time to test anything but basic overclocks and I am still at 5550Mhz all core testing but looks awesome. Working my way up to 5750Mhz.
Like I mentioned ,I play PC Games at 4K so memory is not important ,either is latency of the memory for me.I have tested this over the years a bunch,it has never made a difference in my use case PC Games.

I can say the AMD 7700X is the easiest most satisfying CPU I have ever owned with no weird stuff at all.It is so good makes me want to stop testing as I am good with the AM5 system and just play PC Games.
 
tyke_ said:
will a 4000 series gpu only use pcie 4.0 on a non E board? whereas the E variants 4000 gpu uses pcie 5.0?

HSC0O1x.jpg
www.pugetsystems.com

AMD X670E vs X670 vs B650E vs B650

AMD has launched their latest Ryzen 7000 Series processors, which use a new socket design and thus require new chipsets and motherboards. To fill this role, AMD is offering two chipset models with two variants each. How do X670 and B650 compare? And what differences are found in the "extreme"...
www.pugetsystems.com www.pugetsystems.com
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Yes, but you also need a PCIE 5 GPU (only AMD's RDNA 3 will use it, even Nvidia's unreleased RTX 40 uses only PCIE 4) and based on previous versions of PCIE it will take many years to saturate that bandwidth (and even then the difference in terms of frame rate will be small). Therefore at the moment it is nothing more than a marketing exercise. PCIE 5 will make a much bigger difference in terms of storage, particularly with Microsoft's Direct Storage coming out, but even then it will take years for PCIE 5 to really matter. Most people don't even have fast PCIE 4 NVME drives yet.
 
LtMatt said:
Someone should retest emulator performance.
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EDIT:I am a dumdum,I forgot to check AVX 512 in both video .So I think I will go enable 512 AVX and see if it makes a difference.After trying AVX 512 no difference in FPS with latest RPSC3 emulator

I took your suggestion and tried out the latest emulator.Made 20 minute video. If anyone wants to look at that stuff.

As far as I can tell AM5 works as good as Intel at same clock speed 5400Mhz.
I used the same settings in the RPSC3 Emulator.
Intel video used RTX 3080 GPU an older version of RPSC3.
AMD5 video used RTX 3090 and newest version RPSC3.
The video card does not really matter because of the actual settings

The settings I used for both videos

The Last Of Us 4K PC Gameplay RPSC3 PS3 Emulator 12900k 5400mhz​


The Last Of Us 4K PC Gameplay RPSC3 PS3 Emulator 7700X 5400mhz​

 
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They apparently did another zen4 update today; the emulator was calling Intel's AVX512 fast mode path but Zen4 does AVX512 more efficiently than Intel so updated the emulator to use the slow mode path when Zen4 is present, this results in single digit extra performance
 
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7950x with some cores going as high as 6050mhz. He does mention there is a bit of luck required, some 7950x will crash and can't even handle -5 curve optimiser and some will take -30

 
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This article is interesting and should dispel some myths about the 95c.

www.techpowerup.com

AMD Ryzen 9 7950X Cooling Requirements & Thermal Throttling

High temperature seem to be an issue on the new Ryzen 7000 processors. We're pairing a Ryzen 9 7950X with a $10 stock cooler, a Noctua air-cooler and a 420 mm AIO to get a feel for what the differences are like in terms of °C, MHz and performance in both applications and games.
www.techpowerup.com www.techpowerup.com
 
I confess I am a resolution racist.I post 4K PC gaming videos online and I always get asked questions like this especially every time new PC gear is released.I hate 1080p
Can you do Gameplays on lower resolution? You limited by the GPU. It's interesting to see how well it's scale performance with frequency uplift
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So I clapped back with how about AMD 7700X 5700Mhz all core at 1.30v and 6200Mhz ram and 2200Mhz Infinity fabric with recording straight from desktop and HWInfo64 on to game.

I bet I get NO RESPONSE from the 1080p whor..............wait I actually do not care what resolution I play at but prefer 4K and with the new prices of RTX 4090 and possible AMD Radeon ,I must just buy a phone to play games L/K
:D

 
Just a quick question - when running Cinebench multithreaded test, I get a little over 37,000 - my temp hits a max of 91 degrees, however the frequency of the chip only hits 5.2 or 5.3, how come it doesn’t boost further with that extra headroom?
 
cHk4 said:
Just a quick question - when running Cinebench multithreaded test, I get a little over 37,000 - my temp hits a max of 91 degrees, however the frequency of the chip only hits 5.2 or 5.3, how come it doesn’t boost further with that extra headroom?
Click to expand...

Doesn't have to run at 95c, there is a limit to how far it will boost clocks from the stock clock/voltage profile. You'll need to do manual overclocking if you want more than 5.3 all core
 
Zen 5 CPUs may already be in testing

Mhttps://www.reddit.com/r/Amd/comments/xufjcb/amd_nextgen_zen_5_cpus_get_early_support_within/
 
Grim5 said:
Zen 5 CPUs may already be in testing

Mhttps://www.reddit.com/r/Amd/comments/xufjcb/amd_nextgen_zen_5_cpus_get_early_support_within/
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From what I gather it takes 2+ years to make a CPU and they might already be at the nearly baked stage, when they come out of the oven they need to be able to test them - maybe before doing the big run, this is just a normal stage of CPU development.

I've been watching a lot of Bake Off recently. Not sure if you can tell :)
 
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keyser van someone said:
From what I gather it takes 2+ years to make a CPU and they might already be at the nearly baked stage, when they come out of the oven they need to be able to test them - maybe before doing the big run, this is just a normal stage of CPU development.

I've been watching a lot of Bake Off recently. Not sure if you can tell :)
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4 years apparently...

More likely Zen 5 development has already finished at this stage, taped out and now tuning and testing...

AMD was sampling Zen 4 Epyc to customers since last Q4 (2021), Zen 5 was in development since 2018, confirmed by AMD's video and reported in their (wccf) own report.
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Its a brand new architecture.
 
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clocks-table.png


Looking at this chart makes me wonder if enabling SMT is worth it on Zen 4 CPUs. Allowing more threads always has a cost in frequency in tasks that utilise many threads. It's particularly noticeable that when running 8 threads, frequency remains quite high regardless of the cooler used (Even on the Wraith at 100 percent fan speed).

The other factor, is that many games still do not benefit from SMT or hyperthreading, would be useful to have some testing to confirm this though, on Zen 4...
 
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