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Re: Official: Ryzen 3700X and 3900X review comments

Posted: Tue Jul 09, 2019 8:41 pm
by MOSFET
Professional review all the way, Zak. Too bad this is the 7th or so time since Sunday I've tried to congratulate you on an article well-written. On the bright side, the 3700X looks very competitive, and probably hits the price/performance sweet spot for a lot of people. Not reviewed here, but the $199 Ryzen 5 3600 and the $249 3600X will likely be major sweet spots as well. A few years ago who would've thought AMD would be on 7nm with IPC parity (basically) with Intel about halfway through 2019?

Re: Official: Ryzen 3700X and 3900X review comments

Posted: Wed Jul 10, 2019 10:09 pm
by JustAnEngineer
f0d wrote:
i think im going back to Intel and getting a 9600k
https://www.techspot.com/review/1871-amd-ryzen-3600/
Steven Walton wrote:
Ryzen 5 3600 offers a tremendous value. It smoked the Core i5-9600K in every single application benchmark we ran and worst case matches its single core performance. You get 12 threads opposed to just 6, so it’s no doubt going to age better, but this time you don’t have to roll the dice on Ryzen's longevity, as it’s already faster today.

Re: Official: Ryzen 3700X and 3900X review comments

Posted: Thu Jul 11, 2019 4:01 am
by Bonusbartus
Also posted in the comment:
Does anyone have a clue about what is going on with the AIDA Memory bandwidth results?
I noticed the same performance on other review sites.
The Ryzen 3 3700X has a very low write bandwidth, and also its read bandwidth is lower than all the other cpus.
Memory copy results do look normal.
On the other hand, the Ryzen 9 3900x performs great. The latency is about the same between the two.

Re: Official: Ryzen 3700X and 3900X review comments

Posted: Thu Jul 11, 2019 5:01 am
by JustAnEngineer
Bonusbartus wrote:
Does anyone have a clue about what is going on with the AIDA Memory bandwidth results? The Ryzen 3 3700X has a very low write bandwidth.
enixenigma linked the answer to that in a post on the first page of this thread.

Re: Official: Ryzen 3700X and 3900X review comments

Posted: Thu Jul 11, 2019 9:51 am
by Bonusbartus
JustAnEngineer wrote:
Bonusbartus wrote:
Does anyone have a clue about what is going on with the AIDA Memory bandwidth results? The Ryzen 3 3700X has a very low write bandwidth.
enixenigma linked the answer to that in a post on the first page of this thread.


Thanks! How did I miss that...
I am not sure however how it would be possible to get a copy bandwith higher than the write bandwidth?
Copy == (read then write) right?

Re: Official: Ryzen 3700X and 3900X review comments

Posted: Thu Jul 11, 2019 10:12 am
by just brew it!
Bonusbartus wrote:
I am not sure however how it would be possible to get a copy bandwith higher than the write bandwidth?
Copy == (read then write) right?

Yeah, that does seem a bit odd. Almost has to be some sort of optimization that kicks in when the memory controller detects a block copy is being done, or a quirk of how the tests are coded which favors AMD's memory controller implementation for copy operations (or disfavors it for pure writes).

Re: Official: Ryzen 3700X and 3900X review comments

Posted: Thu Jul 11, 2019 10:39 am
by Waco
There's definitely something weird about that particular test with many CPUs - it's not uncommon for copy bandwidth to report higher than either read OR write.

Re: Official: Ryzen 3700X and 3900X review comments

Posted: Thu Jul 11, 2019 10:50 am
by just brew it!
Waco wrote:
There's definitely something weird about that particular test with many CPUs - it's not uncommon for copy bandwidth to report higher than either read OR write.

As a WAG, they're probably using a REP MOVD instruction for the copy test (which means the test effectively executes entirely in microcode within the CPU), whereas the read/write tests are probably executed as user-level code.

Re: Official: Ryzen 3700X and 3900X review comments

Posted: Thu Jul 11, 2019 3:57 pm
by synthtel2
50 GB/s on a memory copy bandwidth test conventionally means 25 read and 25 write, not 50 and 50. Think max achievable bandwidth, not actual copy rate; copy is just the access pattern.

Re: Official: Ryzen 3700X and 3900X review comments

Posted: Thu Jul 11, 2019 4:24 pm
by just brew it!
synthtel2 wrote:
50 GB/s on a memory copy bandwidth test conventionally means 25 read and 25 write, not 50 and 50. Think max achievable bandwidth, not actual copy rate; copy is just the access pattern.

Ahh, taken in that light, the numbers make more sense.

Re: Official: Ryzen 3700X and 3900X review comments

Posted: Thu Jul 11, 2019 5:35 pm
by Waco
synthtel2 wrote:
50 GB/s on a memory copy bandwidth test conventionally means 25 read and 25 write, not 50 and 50. Think max achievable bandwidth, not actual copy rate; copy is just the access pattern.

Ah, that does make more sense. I thought that might have been the case but I couldn't find anything from Aida stating it explicitly. Perhaps my Google-fu is failing me.

Re: Official: Ryzen 3700X and 3900X review comments

Posted: Fri Jul 12, 2019 2:57 am
by synthtel2
IDK if I've ever seen it explicitly stated in a benchmark context myself, but when I wrote bandwidth tests with a variety of access patterns it worked out that way, and that matches up with the spec (the same wires handle both directions and read/write/copy all get near the theoretical max bandwidth) (SuperTalent link b/c it was handy, JEDEC doesn't make the real deal accessible without a login).

Re: Official: Ryzen 3700X and 3900X review comments

Posted: Fri Jul 12, 2019 7:52 am
by f0d
JustAnEngineer wrote:
f0d wrote:
i think im going back to Intel and getting a 9600k
https://www.techspot.com/review/1871-amd-ryzen-3600/
Steven Walton wrote:
Ryzen 5 3600 offers a tremendous value. It smoked the Core i5-9600K in every single application benchmark we ran and worst case matches its single core performance. You get 12 threads opposed to just 6, so it’s no doubt going to age better, but this time you don’t have to roll the dice on Ryzen's longevity, as it’s already faster today.

this is for my gaming rig so application performance just doesnt matter to me and from what i have seen its faster in most games (although in the review quoted is damn close) out of the box AND it overclocks which is a fun past time for me

could it be the last overclockable cpu? i think that might be one major reason for me to get it because i like tinkering with settings and overclocking, i recently just got an x58 system with a X5675 just because of the fun i have with overclocking (got it to 4.5ghz :P) with chilled water and its actually a very usable system which cost me peanuts ($60 for the mobo and ram and $50 for the cpu)

also where i am in australia the 9600k and motherboard is close enough to the 3600 and motherboard that they are close enough to the same price so either is good depending on what you think is best

if it ends up being a turd over time i will just sell it and go ryzen again im not a fanboy of anything i will always just get what seems best at the time so i will swap between all the brands depending on what i think is best - i have zero loyalty

Re: Official: Ryzen 3700X and 3900X review comments

Posted: Fri Jul 12, 2019 9:49 am
by MileageMayVary
Hoping to see a review of the 3600 and 3600X.
Would also like to see some straight up IPC tests (Zen1, Zen+, Zen2, KabyLake, CoffeeLake) same number of cores, same clock speed: how does each perform?

Also, my Ryzen chart looked a lot better than the one in the article.

Re: Official: Ryzen 3700X and 3900X review comments

Posted: Fri Jul 12, 2019 7:04 pm
by enixenigma
Just received my 3800x from Newegg (a day late...but whatever). Good news is that 1.) I was able to drop it right in my Gigabyte X470 Gaming 5 mobo without issue (which is rare for me - I updated the bios earlier in the week), and 2.) every core seems to be able to hit the advertised boost speed of 4.5GHz. Prime 95 saw core speeds around 4.075 GHz. I look forward to playing with it more and seeing what I can get out of it.

Re: Official: Ryzen 3700X and 3900X review comments

Posted: Fri Jul 12, 2019 10:16 pm
by Waco
Same here - dropped a 3900X into an X570 Gaming X and it booted first time, boost clocks appear to be hitting the rated speeds (even with the included air cooler, I'm waiting on the adapter for my waterblock). So far so good!

Re: Official: Ryzen 3700X and 3900X review comments

Posted: Fri Jul 12, 2019 10:26 pm
by chuckula
Waco wrote:
Same here - dropped a 3900X into an X570 Gaming X and it booted first time


We're cancelling another product in the face of that kind of performance!

Re: Official: Ryzen 3700X and 3900X review comments

Posted: Fri Jul 12, 2019 10:31 pm
by Waco
chuckula wrote:
Waco wrote:
Same here - dropped a 3900X into an X570 Gaming X and it booted first time


We're cancelling another product in the face of that kind of performance!

Given that I managed to spill water on the board in the removal of my waterblock...I was pretty happy with it (I dried it out, obviously). :) I'm seeing sustained clocks even on the Wraith cooler above the base clock by a few hundred MHz when encoding x265. Under water I expect it'll be pretty happy once the mount shows up.

Re: Official: Ryzen 3700X and 3900X review comments

Posted: Sat Jul 13, 2019 8:39 am
by chuckula
Waco wrote:
chuckula wrote:
Waco wrote:
Same here - dropped a 3900X into an X570 Gaming X and it booted first time


We're cancelling another product in the face of that kind of performance!

Given that I managed to spill water on the board in the removal of my waterblock...I was pretty happy with it (I dried it out, obviously). :) I'm seeing sustained clocks even on the Wraith cooler above the base clock by a few hundred MHz when encoding x265. Under water I expect it'll be pretty happy once the mount shows up.


First of all, this is why you need to drink pure grain alcohol when building your system, at 6μS/m it has a very low conductivity and it evaporates quickly to boot.
As for all the craziness with "boost clocks" working well... they're supposed to boost somewhat even for a relatively heavily threaded workload like x265. To put things in context, the x265 re-encode of drone footage I'm running now is "boosting" 1.2 GHz above the nominal 3.5 GHz base frequency of the 4770K.

Re: Official: Ryzen 3700X and 3900X review comments

Posted: Sat Jul 13, 2019 9:50 am
by Waco
If your 4770K is boosting to 4.7 GHz you've overclocked it significantly (and have a great sample as well). That's 800 MHz over it's stock turbo speed. Stock turbo on anything is not going to violate the TDP limits by anywhere near that much.