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Ryzen 3900X thread

MartinPrince said:
Is your PSU non modular? You should really be plugging into all the power connectors on the motherboard.
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It is semi modular, but doesn't have the extra 4pin CPU power cable output. Motherboard manual says you can use just the 8pin or the 8pin + 4pin. However my question is more what will it improve if I get a new PSU with the extra 4pin cable?
 
NuScorpii said:
It is semi modular, but doesn't have the extra 4pin CPU power cable output. Motherboard manual says you can use just the 8pin or the 8pin + 4pin. However my question is more what will it improve if I get a new PSU with the extra 4pin cable?
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OK I see. What motherboard is it? I've had several boards over the years with the extra socket and even some with a 4pin molex in addittion to 2 x 8pin EPS ones.
While for normal stock operation it is not required if overclocking or you have a few peripherals plugged in with overclocking on top then it helps to supply a more stable current to the motherboard.

Does your manual state under what condition you should use the extra 4-pin?
 
NuScorpii said:
I updated the AMD chipset drivers and that helped with allocating of cores. In Cinebench R15 using single thread it now switches between the fastest and second fastest cores on CCD0 CCX1. Had to edit the settings in the BIOS to increase EDC and TDC, now with PBO / auto oc it will hit a constant 4.4GHz in single threaded workload. Multithreaded it will now almost immediately hit max temp 95C and throttle back from 4.1GHz to 3.8GHz. I'm guessing the stock cooler is not up to this?

There are two motherboard connections for CPU power, an 8 pin and a 4 pin. My PSU only has an 8 pin connector. Is it worth getting a new PSU with the extra 4 pin too?
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The stock cooler should handle stock clocks really... So that's strange with the multicore throttling.

You only need the 8 pin it can draw over 300w which you will never do
 
Illuminist said:
The stock cooler should handle stock clocks really... So that's strange with the multicore throttling.
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It idles high 40s, and as soon as there is a full load such as P95 the temp instantly rises to 80+. As soon as P95 is stopped, goes back to ~50 then high 40s again. Is that normal? I'd have thought the temp would ramp up and down.
 
NuScorpii said:
It idles high 40s, and as soon as there is a full load such as P95 the temp instantly rises to 80+. As soon as P95 is stopped, goes back to ~50 then high 40s again. Is that normal? I'd have thought the temp would ramp up and down.
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That sounds perfectly normal to me when I tested the stock heatsink though I suggest using Realbench to put load on your CPU rather than Prime95.
 
NuScorpii said:
It idles high 40s, and as soon as there is a full load such as P95 the temp instantly rises to 80+. As soon as P95 is stopped, goes back to ~50 then high 40s again. Is that normal? I'd have thought the temp would ramp up and down.
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Auto on vcore...? it’s goes way higher than it should. P95 is designed to torture the CPU so don’t be surprised there either.
 
Not done any kind of benchmarking since I've had my 3900X but after seeing Der8auer's video today, this one - https://www.youtube.com/watch?v=l-G1Ukrg-Wk - I've decided to have a look and see what's going on with mine. I won't run Cinebench until the weekend but for now I've got HWInfo and ran it for an hour with Chrome, Steam, Logitech mouse software, Sound Blaster software, HWInfo ofc running while playing Vermintide 2.

4500MHz on 2 cores and 4300 on the rest. Stock BIOS settings except for XMP, Ryzen balanced in Windows. P1.80 BIOS on my x570 Taichi and AGESA 1.003.
 
I’m about to upgrade to 3900X and ROG Hero viii X570 motherboard. Unsure on what ddr4 to get to go with it. Looking forward to the build though not built an amd system since Thunderbird
 
Zeed said:
Get 8packs 3200cl14 ryzen kit
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I’ve been looking at the 3600mhz cl16 or 3866mhz cl18 kit both showing £169.99. Was looking more towards the 3866mhz kit and down clock to 3600mhz and then tighten timing. I will be honest the near £9 delivery charge is putting me off.
 
UrKoS said:
I’ve been looking at the 3600mhz cl16 or 3866mhz cl18 kit both showing £169.99. Was looking more towards the 3866mhz kit and down clock to 3600mhz and then tighten timing. I will be honest the near £9 delivery charge is putting me off.
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The 3600 CL16 is likely the better option in the first place.
 
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