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*** AMD "Zen 4" thread (inc AM5/APU discussion) ***
- Thread starter 4K8KW10
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In the techpowerup review, W1zzard says this about manual overclocking with a 7700X and AIO cooler:
"The Ryzen 7 7700X comes with a fully unlocked multiplier, which makes multiplier-based all-core overclocking very easy. I dialed the voltage up to 1.25 V, which is about the maximum I could run Prime95 at, while not overheating by crossing 115°C—even with a powerful AIO... There was no way that a 5.2 GHz all-core OC would be fully stable, so I settled for 5.1 GHz."
It's a surprise to me to learn that even AIO coolers are struggling with manual overclocking on a 7700X.
Review here:
https://www.techpowerup.com/review/amd-ryzen-7-7700x/26.html
"The Ryzen 7 7700X comes with a fully unlocked multiplier, which makes multiplier-based all-core overclocking very easy. I dialed the voltage up to 1.25 V, which is about the maximum I could run Prime95 at, while not overheating by crossing 115°C—even with a powerful AIO... There was no way that a 5.2 GHz all-core OC would be fully stable, so I settled for 5.1 GHz."
It's a surprise to me to learn that even AIO coolers are struggling with manual overclocking on a 7700X.
Review here:
https://www.techpowerup.com/review/amd-ryzen-7-7700x/26.html
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Manual overclocking is daft, you just lose performance in gaming vs PBO and tuned curve optimiser.
Not sure what has happened to TPU.
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His review reflects my experiences with trying to manually overclock a 7700X. It needs a lot of voltage for stability @5.2/5.3Ghz, apparently more than my air cooler can handle (at least under 95 Celsius).
So, manual overclocking may make more sense with a fairly heavy undervolt. Or, the ability to limit temperature during demanding tasks like running Prime95 + AVX instructions.
So, manual overclocking may make more sense with a fairly heavy undervolt. Or, the ability to limit temperature during demanding tasks like running Prime95 + AVX instructions.
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You lose performance in gaming though. Why would you do that? Unless the only game you play is Prime95 it’s completely illogical. If you want the best performance, you tune you memory frequency and timings, enable PBO and tune curve optimiser. Curve optimiser equals higher frequency, higher performance, less voltage, less heat.
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I don't think manual overclocking is illogical on Zen 4 (for things like gaming), but impracticable for most:
www.youtube.com
Generally, it looks like manual overclocks get the best results in games (a bit higher minimum framerates), but it depends entirely on what OC can be achieved, at acceptable temperatures.
Comment from @AncientGameplays
95C is not the thermal limit. At 95C these will have zero throthling
www.youtube.com
Generally, it looks like manual overclocks get the best results in games (a bit higher minimum framerates), but it depends entirely on what OC can be achieved, at acceptable temperatures.
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I can achieve 5.8Ghz-5.65Ghz with PBO and curve optimiser. Good luck achieving that with all core. If that video has all core winning in gaming, then that means his tune is not working properly. Likely clock stretching.
I think he's running at crazy high temperatures.
When using PBO on Zen 4 CPUs, does each core have it's own independent Vcore voltage? That basically gets increased/decreased based on the load of that particular core?
If so, I assume that's how lower temperatures are possible, compared to a single fixed voltage for all CPU cores.
If so, I assume that's how lower temperatures are possible, compared to a single fixed voltage for all CPU cores.
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Isn't that what curve optimiser is.
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You are working out what is the lowest voltage each core can work at, combined with PBO this can give better performance at lower temperatures.
Every system i've built, the RAM ends up being upgraded to double the initial config towards the end of its lifespan in order to partially keep up with next gen.Every time I would have that mindset that it "ought to be enough for anybody", only to be proven wrong eventually.It really was mindblowing when i went from 64MB RAM to 320MB RAM back in the Voodoo era.
Its those games that are heavily modded that eat up RAM and then some.Cities Skylines with its 4k assets, when heavily pushed will also devour the matching pagefile even with 4x32gb.With that and who knows if there be a CS2 in mind, 32gb would be the minimum system memory and it likely be one stick of it when i do go on board the AM5 train.
Some games can definitely increase their upper limit for RAM capacity dynamically but I'm not sure it will be a restrictive problem for awhile yet.
Oh ok didn't know that. Considering how easy it is to change it I am just starting off with 16GB I think. If I ever need more it will probably be cheaper by then.
I got the 7700X even though it's just for (hopefully) less than 5:months until 3D out.
I thought about getting the 7600 but I thought the 7700 may be easier to sell.
The boost I got and have 30% more give or take and the added cache smoothness be great.
Not in a hurry tho.
rdna3 card takes priority over x3d..and
a new monitor maybe
I decided agasint the upgrade to 5800x3D as zen4 made more sense
I've reduced my PBO curve magnitude to -15 on all cores. Generally, this is a very important setting for stability. This setting has so far passed Prime95 tests for 5 hours, -20 failed after a couple of hours.
I wouldn't recommend a magnitude of -30 as a starting point, unless you enjoy spending many hours stability testing and having random crashes in a few games.
Try -15 and work your way up.
I wouldn't recommend a magnitude of -30 as a starting point, unless you enjoy spending many hours stability testing and having random crashes in a few games.
Try -15 and work your way up.
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