3900x PBO.

[Scottx125]

Lol perfect time for this video to come out, it's quite interesting:

 

[Shac]

How are your temps allowed to get so high? I've got plenty of thermal headroom but for some reason my CPU just doesn't want to have the extra juice? I mean it does on light loads, but under heavy load it just goes up to 66c and sits there...

As his video states if the management decides your cooling is not sufficient it lowers the voltage which lowers the cpu clocks.
My settings are not an all core overclock so the cpu management is still controlling my votages.

However what are your clockspeeds at 66º C under heavy load as you may have got lucky with a cool running chip.

 

[Scottx125]

As his video states if the management decides your cooling is not sufficient it lowers the voltage which lowers the cpu clocks.
My settings are not an all core overclock so the cpu management is still controlling my votages.

However what are your clockspeeds at 66º C under heavy load as you may have got lucky with a cool running chip.

With -0.0625v offset an average of 4150Mhz with a peak of 4175Mhz all core heavy load. That averaged about 66 degrees. And yes a cool running chip will last 10 years or longer. But I'm only looking for it to live as long as I need it which is 5-6 years. As that's my update cycle. My desired temp max was 85 but with people saying that Ryzen is a bit more sensitive to temperatures I've lowered that to 80 max. I'm playing around with manual OC to see how high I can go before I start going past 80 after heavy loads. Though I was at 1.35v LLC3, 4.375Ghz was last stable clock, after that it seems to want more and more voltage to get higher clocks. So I'm gonna find the voltage my CPU is happy with, and then individually over clock the CCX's.

 

[Skynet5]

Ok, so got my new fans in and flipped my cooler. Temps are now down pretty much always below 70c with XFR on. With the same -0.0625 V offset my average speed increased by about 75Mhz from 4075Mhz to 4150Mhz. I've found that lowering the voltage offset more to 0.0831V allows me to peak all core heavy load at about 4175Mhz. Though with single core you don't see 4.6Ghz anymore, most you get is 4.55Ghz. Single core heavy loads are about 4.375Ghz. Again with all this going on temps are below 70c and around 65c-66c.

This is exactly my findings.

 

[Scottx125]

Dial'd in my final manual OC @ 1.3875v (high but running LLC3 (middle setting) and temps are under long heavy loads only hitting 82-83c, idle temps are in mid-low 30's and cores do sleep when not in use(idle 1.1v), only time I'll be needing 100% core use is with blender renders and I do that rarely so it should be fine.)
CCD 1-
CCX1: 4.4Ghz
CCX2: 4.25Ghz
CCD 2-
CCX1: 4.25Ghz
CCX2: 4.375Ghz

 

[andy_mk3]

or to put a different lens on it, a 3.4% decrease in single threaded which would be unoticible for a 10.2% increase in multi threaded.

Exactly. Very little I do relies on single thread performance to the point were a few mhz are going to make any difference at all.

Lol perfect time for this video to come out, it's quite interesting:

Caught a bit of that earlier on. From what I can make out, a 3900x overclocked at 1.35v idle and at 1.3v under load is pretty safe. I don't run my cpu flat out all day long either.

 

[Scottx125]

Exactly. Very little I do relies on single thread performance to the point were a few mhz are going to make any difference at all.



Caught a bit of that earlier on. From what I can make out, a 3900x overclocked at 1.35v idle and at 1.3v under load is pretty safe. I don't run my cpu flat out all day long either.

Yeah. If I was running my CPU at 85c all year round then I'd expect it to be dead within 2 years. But most of the time my CPU is sitting idle at 35c and under gaming loads might hit 50c-60c. So as far as I'm concerned it should be okay with the occasional heavy load thrown in. XFR works fine, but it's honestly not configurable enough. You should be allowed to set a maximum temperature at which your CPU begins to limit itself. If i could do that I'd just put it on 80c-85c and leave it at that. It's no good if your CPU is going 100% at 66c when there's still plenty of room for more speed.

 

[andy_mk3]

Yeah. If I was running my CPU at 85c all year round then I'd expect it to be dead within 2 years. But most of the time my CPU is sitting idle at 35c and under gaming loads might hit 50c-60c. So as far as I'm concerned it should be okay with the occasional heavy load thrown in. XFR works fine, but it's honestly not configurable enough. You should be allowed to set a maximum temperature at which your CPU begins to limit itself. If i could do that I'd just put it on 80c-85c and leave it at that. It's no good if your CPU is going 100% at 66c when there's still plenty of room for more speed.

Yeah my CPU is the same. I don't bother with hammering it with synthetic loads like prime95, I do Cinebench R20 as a quick stability and performance check, the rest I do never hammers the CPU anywhere near as much.

I'm generally quite disappointed in PBO/XFR though. It doesn't do what anyone really expected it to do. AMD led us to believe XFR would see us above stock boost speeds. But I'm really happy with the performance with a manual OC so I will leave it at that now. It's stable, always <70C and chews through anything thrown at it.