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Why 3800X? They are binned... I think

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post #21 of 127 (permalink) Old 08-03-2019, 01:21 PM - Thread Starter
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Quote: Originally Posted by almstsobur View Post
Yes, completely. Unfortunately for hrs on end sometimes.
That being said, I did have crashes to desktop from Horizon when my CPU was dialed in and I was working on memory. If your memory is OC'ed, I'd up the voltage a bit, or dial it down a bit and see if it stops. In my case my timings were just a bit too tight. I have no experience with the first gen though, just 2600x 3800x

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post #22 of 127 (permalink) Old 08-03-2019, 01:33 PM
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Anyone tried IBT @ Very HIgh?

I just went for it to see what it would require for voltage to pass, was a little more than I was comfortable with and I found out it is really running much slower than it did on my Ryzen 7 1700.

The 3800X tops out @ ~110GFlops when my old 1700 @4.0Ghz could do 180GFlops and as such complete a lot faster. Maybe the halved memory write speed limit hitting here?
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Gigabyte X570 AORUS XTREME, Ryzen 7 3800X 4.4Ghz, 4266/1900 MEM/FCLK, 18.26.19.44.73.tRFC 650 1T 1.45V
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post #23 of 127 (permalink) Old 08-03-2019, 01:58 PM
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Quote: Originally Posted by Nighthog View Post
Anyone tried IBT @ Very HIgh?

I just went for it to see what it would require for voltage to pass, was a little more than I was comfortable with and I found out it is really running much slower than it did on my Ryzen 7 1700.

The 3800X tops out @ ~110GFlops when my old 1700 @4.0Ghz could do 180GFlops and as such complete a lot faster. Maybe the halved memory write speed limit hitting here?
Where would the IBT results be useful in real world applications though?

Also subbed, I'd like to know the results of 3700X users.


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post #24 of 127 (permalink) Old 08-03-2019, 03:24 PM
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Not to hijack thread, but isn't the 3900X worth getting over the 3800X? Just $100 difference. I can't find any benchmarks between the two.

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post #25 of 127 (permalink) Old 08-03-2019, 04:46 PM
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https://twitter.com/HardwareNumb3rs/...93620981174272
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Quote: Originally Posted by Schnitter View Post
Not to hijack thread, but isn't the 3900X worth getting over the 3800X? Just $100 difference. I can't find any benchmarks between the two.
3900X is 12 core 24 thread, 2 DIE ("CCD")

3800X is 8 core 16 thread , 1 DIE ("CCD") , same as 3700X

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post #26 of 127 (permalink) Old 08-03-2019, 05:12 PM
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Quote: Originally Posted by Speedster159 View Post
Where would the IBT results be useful in real world applications though?
Cinebench R20 then good enough?

4400Mhz CPU 3800Mhz MEM 1900 FCLK: 5235points | 500points
4400Mhz CPU 4066Mhz MEM 1900 FCLK: 5263points | 512points
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Gigabyte X570 AORUS XTREME, Ryzen 7 3800X 4.4Ghz, 4266/1900 MEM/FCLK, 18.26.19.44.73.tRFC 650 1T 1.45V
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post #27 of 127 (permalink) Old 08-03-2019, 05:35 PM
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Quote: Originally Posted by Speedster159 View Post
Where would the IBT results be useful in real world applications though?
IBT isn't useful with use of real world applications.
It's useful for gauging system stability and most real world applications won't load the CPU as heavily as IBT.
So the theory is if it's IBT stable at X settings, then you have a very good chance of very good stability while using the real world applications.
That is all.


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post #28 of 127 (permalink) Old 08-03-2019, 05:38 PM
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Quote: Originally Posted by Schnitter View Post
Not to hijack thread, but isn't the 3900X worth getting over the 3800X? Just $100 difference. I can't find any benchmarks between the two.
https://cpu.userbenchmark.com/Compar...00X/4044vs4047


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post #29 of 127 (permalink) Old 08-03-2019, 06:58 PM - Thread Starter
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Quote: Originally Posted by Schnitter View Post
Not to hijack thread, but isn't the 3900X worth getting over the 3800X? Just $100 difference. I can't find any benchmarks between the two.
Depends what you are doing with the chip, for heavy multi-thread workloads, production software, obviously it would be worth it. From a pure overclocking or gaming perspective, I would say no.

My personal issues with the 3900 are as follows:

Harder to keep cool, we see already how the scaling is directly effected by temperature.
The surface area to cooler gets saturated even with the best of water-blocks, that is a lot of cores in a small package, it's not Threadripper size.
The chip very likely already has some weak silicon, or those chips would be in the 3950 bin. Granted the weak ones are disabled, but it makes me assume less headroom above and beyond.
Uses a pretty fair amount more power in every respect, VRM, motherboard, CPU, for no net gain for my use case.
A little bit of an unknown factor regarding latency and proper software instructions for using 2 CCD's


The one nice gain is the doubling of the cache, but again in "normal" use I am not sure how much a gain that is, considering AMD didn't seem to skimp on the cache with any of the 3000 series. The net effect may turn out to be zero, because the cache is the same per CCD. Don't get me wrong, if you have a use case for the 3900, spend the extra. I just don't, 16 threads as fast as I can get them is my ideal scenario and I thought the 3800 is the best candidate.


Last edited by almstsobur; 08-03-2019 at 07:01 PM.
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post #30 of 127 (permalink) Old 08-03-2019, 07:06 PM - Thread Starter
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Quote: Originally Posted by AlphaC View Post
https://twitter.com/HardwareNumb3rs/...93620981174272
Attachment 285784



3900X is 12 core 24 thread, 2 DIE ("CCD")

3800X is 8 core 16 thread , 1 DIE ("CCD") , same as 3700X
Thank You, this is very good info, only 4 3800's that he says were tested, but none the less, shows the same thing I/We have been seeing. Little more headroom, little less power needed. leaning in the direction that 3800 owners paid for something more than changes to the internal instructions.

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