Team Red Lobbyist
Join Date: Jan 2009
Location: Plymouth, MA - Soxnation
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
Thermaltake 280mm Rad AIO with lots of bling
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.
Last edited by Gill..; 07-11-2019 at 12:45 AM.