3900x First impressions. Precision Boost Overdrive vs. Manual OC on X370 - Overclock.net - An Overclocking Community

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3900x First impressions. Precision Boost Overdrive vs. Manual OC on X370

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post #1 of 22 (permalink) Old 07-10-2019, 10:37 PM - Thread Starter
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3900x First impressions. Precision Boost Overdrive vs. Manual OC on X370

Bravo, AMD engineers!

X370 Asrock Killer SLI/ac
Gskill TridentZ 3600 AMD SKU - for now at 3200 CL16/18/18/18/36
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IC Diamond 24K (my personal favorite) thermal paste

So with a manual overclock, my R7 1700 topped out rock solid stable at 3.9 anywhere around the 1.38v mark. With the new Gskill I bought for Ryzen 3000, I got the same memory OC on the X370 with the newest BIOS's (5.3 and 5.4). It was a great chip, I loved it from day one when I got it in March of 2017. As much as I had loved my BE 550 with it's 2 free unlocked cores (because who doesn't love free). I knew the 1700 would win my heart. It did! From March of 2017 I knew one thing. Wait 2 gens...get a 12 core. And that's what I did.

Don't get me wrong, I'd love a 16 core 3950X...but for a $140 MSRP X370 board..I knew that would be asking a lot..12 cores...bring it.

As I'm sure most of you guys reading this waited with anticipation the last year or so...I was NOT waiting for reviews of this chip. It was going to be mine ASAP. It was a struggle getting it, as I'm sure you'll all have your own stories..but here it is day 3..in my hands...and I got home at 9pm tonight and knew it would be a long night.

Cleaned my rig, took out the 1700 (going to my son to bring his B350 to it's full potential, I'll use the 2200G as a backup chip)..and in it went.

I'm sure I don't have to mention to you guys on OCN...but just so it's said....UPDATE your BIOS FIRST!! I also put it back to stock settings before shutting it down. The boot process was long...way long...the suspense killed me (like heart in throat)....and into BIOS we went.

I started with stock settings. Ran Cinebench, Geekbench...and WOW..impressive. Almost 3100 on R15, Geekbench impressive too.

Then I went to Precision Boost Overdrive. From all I've read and watched, it seemed the way to go. The BIOS unlocked a TON of new options with the 3900 that weren't there with the 1700. I kind of let it do it's thing...and back into Windows. Cinebench and Geekbench a bit better, but obviously I'm still not done. I wanted to put first impressions here, so we can all learn together.

What's amazing is that a.)It's totally insane out of the box b.)I'm totally hitting 4.6 plus on multiple cores on Boost*see attached pic* c.)I'm averaging 150% to close to double the computational power of the 1700.....AT 65 watts in most cases.

Let me give you a frame of reference. My 1700 at 3.9 would hit 140 watts at 100%..temps would be mid 60's with the AIO. 1680s to 1730 Cinebench (stupid Windows updates!). 600 hash/sec at best on XMR Stak (I'm a dirty miner!). XMR uses 8 of the 16 threads..anything above that yielded no addition hashes.

R9 3900X - 4.1-4.2 when most or all cores in use. 5 or so cores regularly hit that 4.6 plus. I'm at 78% usage as I type..I have 18 of the 24 cores mining XMR at 1250 Hash/sec - at 65 watts...at 55C...same AIO.

Double the computation in some instances, 1.5X at minimum, half the energy in normal scenarios..at less temps...on PBO!

I tried manually OC'ing to 4.3 all cores. Got into windows, tried Geekbench. Dead..back to PBO. Obviously I'll keep trying. But I don't know if I want to. If multiple cores can hit 4.6 in say a gaming scenario, while the rest stay super efficient...and half the energy my 1700 was using..why would I bother. I'd rather spend the time on the memory clocks and timings (Help me Buildzoid, you're my only hope!).

To be fair to my 1700, the 3900X will get to 120 Watts at 100% usage. But really, there's NO comparison between these two chips...It's such a leap forward, I'm truly amazed (I knew I would be, but wow).

One more nail in the coffin. My Vega 56 hashes at 1850 hash/sec...pulls 157 watts. The 3900X...1250 hash/sec at 65 watts. Enough said. The future is here gentlemen/ladies. PBO is beating what we can do..but OCN will still exist, because we'll need to find the fine balance with the memory and the boards.

But if I could leave you with one thing. This is on a mid range X370. VRM's are decent (Buildzoid would still not approve)...but don't let any of these naysayers out there scare you into an X570 that some brands are pumping WAY too much energy into the chips/VRMS and RAM just to try to overclock something that has been superseded by superior engineering (PBO).

I wouldn't be a member here if I didn't keep trying. But the performance I'm seeing on my 3900X is making me a true believer in PBO. Now to tweak that (there are a bunch of settings in that alone as well)...so let the discussion commence!

To anyone waiting for backorders...STICK IT OUT. I'm entirely happy with mine! I could have flipped it on Ebay today for $150 profit. But this is a chip I've been waiting for, for two years. And I'd officially have to quit OCN if I were to pull that sort of blasphemy.
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Quote:
Originally Posted by Fatty Beef go_quote.gif
I did my build in the kitchen (no carpets in sight) and in underwear to avoid any possible static. My roomates where kinda creeped out. headscratch.gif
Quote:
Originally Posted by BlackHoleSon go_quote.gif
he reads Pentiumhouse magazine and gets so turned on by it, he will never use another processor.



Last edited by Gill..; 07-11-2019 at 12:45 AM.
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post #2 of 22 (permalink) Old 07-10-2019, 11:05 PM
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post #3 of 22 (permalink) Old 07-11-2019, 12:12 AM
 
 
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Have you looked into whether undervolting would allow PBO to boost higher?

Really been eyeballing the 3900x myself so these findings are very helpful. I did also get the impression that OC's would not be worth it because PB/PBO seemed to do the job very well.

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post #4 of 22 (permalink) Old 07-11-2019, 12:37 AM - Thread Starter
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Undervolting Vcore? I have that set to Auto now - let PBO do it. So one setting I have is PBO Scalar at 10X. From what I can tell, it will boost the voltage where needed for max frequency for longer durations.

There was another setting that enabled the Max clocks to go beyond where AMD supposedly allows. Definitely seems like 5 of the cores are stronger than the rest (4.6 plus), with the rest maxing out around 4.3ish. Another notable is that the main clocks seem to be 4.2 at all times with an idle wattage of 3.8 watts....yes, you read that right.

Part of me says, there's the potential gain - let's get them all to 4.3. But if I do that, I lose PBO - and those spikes above 4.6...so is it really worth it for the extra 100 Mhz for all of them - and fight for stability - or be happy with the silicon that I have. 5 cores (so 10 threads?? I need to find something that will show me ALL threads and their clocks...CPUID's HW Monitor is just showing me the cores as a whole) that are strong seem to be a good pull on the silicon lottery.

Now the RAM...that's being a punk when I try to bring it above 3200. That will take some work. I really thought the memory controllers would work like magic...

Too funny though..I ran Division 2, SOTTR, Timespy and Firestrike and GTA V for some quick game benches...I don't think any of them topped 30% usage on the CPU...I'm TOTALLY GPU bound now with my Vega 56 (which oddly was averaging 1715 or so core clock at 50% power limit on GTA V)...only game that was holding it above the 1700 mark consistently.

AIB 5700XT's can't come fast enough...

So, Go X370/X470 B350 and B450 if they're decent. No Chipset fans, no ridiculous pricing, no PCIE 4 marketing hype. Way less heat and wattage from not only myself, but from what I'm seeing with others.

How the cores and clocks behave is wicked interesting to me...especially with the power consumption. Hopefully we'll get more info as people start getting them on the ground.

Quote:
Originally Posted by Fatty Beef go_quote.gif
I did my build in the kitchen (no carpets in sight) and in underwear to avoid any possible static. My roomates where kinda creeped out. headscratch.gif
Quote:
Originally Posted by BlackHoleSon go_quote.gif
he reads Pentiumhouse magazine and gets so turned on by it, he will never use another processor.


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post #5 of 22 (permalink) Old 07-11-2019, 02:28 AM
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The Memory support on the first launch B350/X370 was really crappy on some motherboards, had nothing much to do with the IMC on the CPU:s had as everyone raved from my own observations.

It was that the boards that could barely manage 3200Mhz speeds. I think the cheaper ASRock boards where some with major issues and another being the even more expensive ASUS X370 Prime Pro. (X470 version got fixed though)

MSI and Gigabyte had better support from the get go if I recall. Though this was mostly a AGESA issue as well with enabling the better memory speeds came quite a bit late in the game.

Not all X470 boards were good either.

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post #6 of 22 (permalink) Old 07-11-2019, 07:46 AM
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Consider adding a negative voltage offset.

Typically the CPU starts downclocking due to thermals. Less voltage == less watts == longer time at boost.

At least that was how my 2700x performed. I suspect you'll have a higher all core boost with a negative voltage offset

I miss the golden days of OC'n
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post #7 of 22 (permalink) Old 07-11-2019, 08:05 AM
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i thought this was a great video by Jayz2Cents on OCing Ryzen... It appears that auto settings for some mobos, the voltage for CPU, I.F., memory, etc. are all way too high! Jay is going to do a deep dive and see what this really turns out, but it does show some promise!


EDIT: I know you're board is not an X570 so I'm not sure if the same settings apply to your mobo, but if you could match you infinity fabric settings (1800) and push your memory to 3600 that would be nice to see. Please note I haven't used AMD in ages (since Phenom) so I'm not familiar with 1st and 2nd Gen Ryzen bios settings specially with Infinity Fabric.

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post #8 of 22 (permalink) Old 07-11-2019, 08:19 AM
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I enjoyed your enthusiasm for the performance uplift from the 1700X to the 3900X (I built a 2700 rig for 4K video editing myself), but not for PBO or any automatic overclocking mechanisms without equal options to do them manually. Of course, AMD is only following the likes of NVidia's Boost on GPU's and most motherboard's BIOS overclocking features (which employ egregious voltages btw.)

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post #9 of 22 (permalink) Old 07-11-2019, 09:18 AM
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asrock boards are still waiting for AGESA 1.0.0.3 BIOS's for x370 It should provide more stable 3200+ speeds on memory.
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post #10 of 22 (permalink) Old 07-11-2019, 09:55 AM
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Oh boy , this is the review I was waiting for to pull the trigger on My CrossHair VI Extreme and put that 3900X cpu monster . is stupid how good marketing can convince people to buy a expensive buggy X570 board with a PCIE.4.0 that you probably never use and see working .
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