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Need help undervolting the 5800x. getting 90 degrees in cinebench r20 and r23 this normal?

MrFrazzles said:
does the usages of tdp, edc, ppt and cpu power matter that much?
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There's a point at which if you lower them too much then performance won't be what it could be. If you try what I suggested with EDC and check the cinebench scores you may find same performance at lower temps. Shaving 15C off as you've already done is already very good though, if performance appears to be the same with no downclocking on load.
 
How fast does it cool down after its hit max temp ? If it takes a long time then it could be a bad contact on heatsink or bad fan config (fans fighting each other and reducing efficiency.)
 
Danny75 said:
There's a point at which if you lower them too much then performance won't be what it could be. If you try what I suggested with EDC and check the cinebench scores you may find same performance at lower temps. Shaving 15C off as you've already done is already very good though, if performance appears to be the same with no downclocking on load.
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yeah ive tried setting new limits and temps are WAY lower. why on earth are my stock pbo limits set stupidly high??
 
MrFrazzles said:
the rad isnt too hot.
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Stupid question but have you actually tried reseating the cooler as it rather sounds you don't have good contact with the cpu.

Always the simplest thing to try. Take the cooler off, clean it up, new paste, and screw it back down ensuring even pressure.

If you don't see a drastic reduction in temps after that then it might be worth exploring undervolts but you said you're not very experienced with pcs so I'd tread very carefully and go one step at a time so things are easy to back out if they go wrong.
 
90c doesn't actually sound especially unusual for a 5800X using default PBO settings like that, they do run warm. It doesn't look like anyone has actually explained to you what you're actually doing though, i.e. people are giving you numbers to play with but not really explaining what that is actually doing.

For a start, the reason we use PBO 2's Curve Optimiser for this is because of the way Ryzen 3 handles power relative to operating frequency which becomes important when the boost algorithm is factored in and it always is as that's how these CPU's work, and Curve Optimiser is allowing us to alter this. So the negative curve setting is basically telling the CPU to boost using less power, the default is set high enough that even a very poorly binned chip should have no problems hitting the numbers on the box, most will do rather better than that though, when I say better I mean do it while needing less power or use the same power to go higher. There will come a point where it can't maintain the boost clock anymore and it will no-longer be able to boost as high of course when dialing in a negative and there is also a point where it will do it but isn't quite stable aswell and you may sea WHEA errors, this is a bit less obvious though tbh and requires some testing.

EDC = Electrical Design Current (This is the peak current supplied under maximum all core boost)
TDC = Thermal Design Current (This is the maximum amount of current supplied under a thermally constrained scenario, so this setting will be used to bring down temps when the CPU is being maxed out for long periods of time)
PPT - Package Power Tracking (This is the maximum amount of power in WATTS that the whole CPU package is allowed to pull, the other two are more important than this one to the 90c peaks you are seeing but this number needs to be higher than your EDC.


Bear in mind if you use the Boost Override settings to actually increase overall clockspeed, you wont be able to be quite so aggressive with the negative curve, as it will need more power to hit and sustain higher clock speeds. I wouldn't worry about this for now though, better to just get your temperatures at stock speeds down first and then figure out how much more performance you might be able to get later if you're interested. You may just find using a negative of -12 or -15 with something like 90 for the TDC and 110-115 for the EDC works well enough for you as is, leave PPT at around 140 and just forget about it, but you can fine tune it much more than that if you wish and do it on a per core basis.

I would recommend you watch this video, it's the best guide to using PBO 2 I have seen https://www.youtube.com/watch?v=dU5qLJqTSAc and it explains what's going on.
 
Have you tried a locked speed & voltage? My 5800x was too hot for my liking at stock and when messing with curve optimizer. I now have it at 4.6ghz locked at 1.225v and its cooler than my old i5 2500k, barely breaks 60c in intensive games on low pump/fan speeds.

Worth a shot just whacking in 4.5/4.6ghz at 1.25v and see if you like it, takes 1 minute to change.
 
Hi all. Posted this in CPU cooling but having read this thread, this looks a much more appropriate place (made a few edits).

Wow its been many years since I last posted here, wonder if anyone remembers me! :)

I've recently made my way back to PC gaming, and love it.

So I've got a 5800x at stock using PBO it ran 4.7ghz 80c in game (max) and 90c Cinebench. I downloaded the Ryzen Master app and tested it out and undervolted got it to 1.27v @4600ghz. Cinebench runs solid at 80c and games at 60c (a drop of 20c). So now I believe its best to translate this into overclocking in the bios? My question is what exactly do I have to do? I'm new to overclocking and there's too many options I don't understand to just try things out and see what works. The motherboard is a MSI B550 Tomahawk, with a Black Rock 4 Pro Cooler.

Would really appreciate is someone would tell me what options to change within the bios. It dosnt have to be exactly like for like as the Ryzen Master overclock, I believe an offset negative voltage is preferable reading this thread? On Ryzen Master its showing at 90% EDC limit of 140a been used when I "test and apply" that overclock.
 
I would suggest you use PBO2 Boost Override to overlock. For that I would refer you to my above post and the video I linked. While I was talking mainly about keeping the same performance but being able to reduce the power used to achieve that and thus the heat output ....you can also use this to boost performance by acheiving higher boost speeds.
 
Thank you both. Am going to get my OC on tonight when I get in. I had to order a cheap wired keyboard just so I could input the numbers into the bios as I only had a bluetooth mechanical one.
 
Hostile_18 said:
Hi all. Posted this in CPU cooling but having read this thread, this looks a much more appropriate place (made a few edits).

Wow its been many years since I last posted here, wonder if anyone remembers me! :)

I've recently made my way back to PC gaming, and love it.

So I've got a 5800x at stock using PBO it ran 4.7ghz 80c in game (max) and 90c Cinebench. I downloaded the Ryzen Master app and tested it out and undervolted got it to 1.27v @4600ghz. Cinebench runs solid at 80c and games at 60c (a drop of 20c). So now I believe its best to translate this into overclocking in the bios? My question is what exactly do I have to do? I'm new to overclocking and there's too many options I don't understand to just try things out and see what works. The motherboard is a MSI B550 Tomahawk, with a Black Rock 4 Pro Cooler.

Would really appreciate is someone would tell me what options to change within the bios. It dosnt have to be exactly like for like as the Ryzen Master overclock, I believe an offset negative voltage is preferable reading this thread? On Ryzen Master its showing at 90% EDC limit of 140a been used when I "test and apply" that overclock.
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From what is looks like is you have a manual OC so to translate this to bios you would need to set the CPU multiplier from auto to 46 and change the CPU core voltage from auto to override then punch in 1.27
 
Joxeon said:
From what is looks like is you have a manual OC so to translate this to bios you would need to set the CPU multiplier from auto to 46 and change the CPU core voltage from auto to override then punch in 1.27
Click to expand...

Is it better for me to put this in as a manual overclock or as a negative offset?

Just so I understand what am I multiplying by 46, that probably sounds more extreme than it is!
 
Update: In the end I went with Precision Boost Overdrive on, negative curve -30 all cores. PPT: 142, TDC 95a, EDC 90a.

I get 15083 Cinebench 23 @76c, in game 68-72c, 36c-39c Idle. Using a Black Rock 4 Pro.

Pretty happy with that.
 
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