X670 Overclock Guide

BiscuitBomber

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Does anyone have any suggestions regarding a good guide to follow to Overclock a 7950X? I currently have my curve optimizer at -10 (All Core) and everything seems to be stable. Anything beyond that I get random crashing. I figured I could do a per core via CO, but that's very time consuming to determine the value of each core.
 

citay

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With most "basic" OC like all-core OC you're gonna end up slower than stock with this beast, simply because in anything less than full multithreaded load, the stock configuration would actually boost higher. In general, with this CPU, AMD already got 99% of the available performance out of it, so there is really not much headroom to overclock, plus you're quickly gonna run into temperature problems. So CPU OC is kind of a moot point nowadays with the top CPU models, you'd be better off concentrating on the RAM.
 

BiscuitBomber

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With most "basic" OC like all-core OC you're gonna end up slower than stock with this beast, simply because in anything less than full multithreaded load, the stock configuration would actually boost higher. In general, with this CPU, AMD already got 99% of the available performance out of it, so there is really not much headroom to overclock, plus you're quickly gonna run into temperature problems. So CPU OC is kind of a moot point nowadays with the top CPU models, you'd be better off concentrating on the RAM.
Good to know. Yeah, I have my RAM at 6000 Mhz. So, I don't think I'll be getting better than that.
 

citay

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Yeah you have a pretty nice setup then. Don't bother too much with OC on these high-end CPUs. They are set up so aggressively by default nowadays (because Intel and AMD want to beat each other in certain benchmarks on launch day) that they leave almost nothing untapped. Five to seven years ago, what they do to the top CPU models at stock would've only been done by overclockers at home, that's how far beyond the most efficient frequency range they push these CPUs now, with accordingly high stock VCore.

If anything, you want to gain back some efficiency by undervolting or setting lower power limits. You can even get higher performance by that, because, say you undervolt by -0.08V or so, then you're getting lower power consumption and lower temperatures, which in turn can make the CPU boost to higher frequencies if it sees more headroom in those parameters that it constantly monitors. Another example, if you set the ECO mode with 142W power limit (PPT), you only lose 5% performance, but at 38% lower power draw! Whenever you have a huge decrease in power draw at a much smaller decrease in performance, you see that you're moving towards a much more comfortable operating range for the CPU. Conversely, this is a sign that AMD deliberately let the power draw go too high, just to have slightly longer result bars in some benchmarks. Same with the top-end GPUs for example, it's all about looking that tiny bit better in the reviews, this can make or break how successful a CPU/GPU is going to be viewed as by the customer.

Of course, it's completely silly to go from 142W to 230W for only 5% more fully multithreaded performance, such jumps should be left to overclockers, and then there would be something perhaps worth overclocking for. The way it is now, the top CPUs are already screaming for mercy at stock (or make your CPU cooler do that). So no use in further OC.
 

Alan J T

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Ryzen master will set Curve optimiser for you

Will also show your fastest core this is likely the one causing a problem with less than -10

I can set all to -30 except Core three it must be no lower than -25 or the system will crash

Been a bit since I used to use as once you get setting that is it. you just set in BIOS and forget about it.
But make sure the ones I circled are set the same and then click on Validate Offset that should auto-scan for you
I think has been a while.

Ya it has been a while set cores to -20 or -30 on all of them and then validate it should give you a value it can use without crashing.
No, that is not quite right is to test if you know your values:bonk:
OK so ya I had forgotten select Auto off-set as well and then select Start Optimise this will give you a working Offset value

It will all most all ways be your fastest core that is the problem with Curver Optimiser if you still get crashed just bump it up a bit but leave the rest as set.
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Alan J T

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If anything, you want to gain back some efficiency by undervolting or setting lower power limits. You can even get higher performance by that, because, say you undervolt by -0.08V or so,
Citay best way to achieve and lose nothing in performance is go to PBO look for Thermal cap or limit and set to 75c this will do all the work and may gain more performance over stock or Auto settings
No need to use under volt or use Echo mode

Just PBO with Curve optimiser setting and Thermal limit set to 85c or 75c
And the better your cooler the better the performance you will get Cooler has become quite important on the AM5 CPU as your boost and clocks are all tied to temps more so than they were before.
 

BiscuitBomber

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Citay best way to achieve and lose nothing in performance is go to PBO look for Thermal cap or limit and set to 75c this will do all the work and may gain more performance over stock or Auto settings
No need to use under volt or use Echo mode

Just PBO with Curve optimiser setting and Thermal limit set to 85c or 75c
And the better your cooler the better the performance you will get Cooler has become quite important on the AM5 CPU as your boost and clocks are all tied to temps more so than they were before.
Yeah I didn't have much luck with Curve Optimizer it made all of my cores -30 and then everything crashed all the time lol.
 

BiscuitBomber

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I also ran it as single core optimizer not a single crash... but yeah it's always putting each core at -30. I'm stable at -10. So maybe if I just apply the auto overclock?
 

Alan J T

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I also ran it as single core optimizer not a single crash... but yeah it's always putting each core at -30. I'm stable at -10. So maybe if I just apply the auto overclock?
Took me about a week to get Curve Optimiser sorted there is an App that may help you can change it on the fly and the setting won't get saved between reboots or system restarts
 

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BiscuitBomber

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I'll have to check it out... right now I have all my cores at -10 and Core 0 and 1 at -15. Figured I'll do a bit at a time for the day and see if I get any crashes.
 

Alan J T

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Set the two cores with stars next to them to -10 and set the rest to -20 see how it goes

Make sure core selection is set to OC and not OS
as this can also mess up Curver optmiser settings
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lostking20015bf02e6

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I settled down to all core -10 and TDP 125W. 7950x runs below 85C at full load.
By default, 95C is too high and it is not stable with my air cooler. It seems that in order to get 100% spec performance, you have to have AIO or custom water cooler.
 

BiscuitBomber

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I settled down to all core -10 and TDP 125W. 7950x runs below 85C at full load.
By default, 95C is too high and it is not stable with my air cooler. It seems that in order to get 100% spec performance, you have to have AIO or custom water cooler.
Yes, AMD recommends using a 280MM AIO or larger with the 7900X/7950X. I'm using a 360MM, but only time I ever hit above 70 degrees is when benchmarking Cinebench etc. I'm using -18 on more of my cores and -10 on my two worst.
 

andysa196157402e0

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Im tinkering with Curve Optimizer while in Eco Mode. First system optimised run gave -30 on all cores in advanced mode, while Eco mode was also set. When I switched to Basic Mode view I noticed CO was not enabled? So I did the system optimization in Basic Mode, I noticed the option to lower the CO value lower than -30, so I set in -35 and let the system optimize, all cores were set to -35. Does Eco Mode impact how much negative opimization can be applied?

I've ran Cinebench R23 on single and all core no issues, CPU temp was around 75*C.

EXP 1 timing applied, Fabric clock 2033

Update: 1

So I set CO optimization to -40, increased the test duration from 15 or what ever it was to 120 seconds, the optimization took >3hrs to complete. Afterwards it applied -40 to all cores, going to run Cinebench R23 bench marks.

Update: 2
I saw game World of Tanks crash that Ive never experienced before, so I assume some instabilty at this level

Update: 3

Its all new to me, I thought I might be doing something wrong, but Ive got a better understanding of PBO now. I set PBO to default, applied EXPO 1 and auto OC +200, then I tried to see if i could go to -45 setting, the optimisation ran without restarts, but failed to boot. Thru process of illimination in the bios I incrementally increased each core negative value from -40 from previous optimisation until it failed to boot, I then dialled back 2 on each core to where Im at now, i experience some instability and dialed back >> to where the PC is stable.

Core 0 = -40 (*2) >> -33
Core 1 = -40 >> -33
Core 2 = -38 >> -32
Core 3 = -39 >> -32
Core 4 = -41 (*1) >> -34
Core 5 = -41 >> -34
 

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