Ideal temperatures for an overclocked R9 3900x
Ideal temperatures for an overclocked R9 3900x
I've successfully increased my new liquid cooled 3900x to 4.4ghz across all cores at 1.3v. My idle temperatures sit around the mid 30s, while full load pushes them into the mid 70s and occasionally the low 80s. I'm curious if these readings are typical for a machine I just assembled.
The load I'm experiencing is due to my best 360 rad setup with all copper blocks, and the temperatures are higher in Prime95 8kfft at 3800x @ 4.4GHz. Most 3900x models won't exceed 4.2GHz even with overclocking and remain stable. Have you run any stability tests? Did you try using a HEVC load? AyoKeito
Safe temperatures are certain. Everything appears alright.
"Liquid Cooled" is too general. Not all liquid coolers are the same.
Do you have an AIO or a homemade loop? What is the radius?
I would say yes.
My setup matches yours with the same configuration and hardware, including a silent custom watercooling system and RTX 1080 on the same loop, resulting in similar temperatures.
4.4GHz all cores from a 3900x at 1.3volts is impressive. However, cooling will be a challenge, especially with a HEVC workload. Overclocking options are listed in the table below.
3900X
Not Tested
4.00GHz
1.200V
100%
3900X
Not Tested
4.05GHz
1.212V
Top 87%
3900X
Not Tested
4.10GHz
1.225V
Top 68%
3900X
Not Tested
4.15GHz
1.237V
Top 35%
3900X
Not Tested
4.20GHz
1.250V
Top 6%
Do you have the FIT value for your 3900x? The FIT value is approximately 1.325 volts. If your Vcore voltage exceeds this FIT, your CPU may degrade. This could occur due to a Vcore that's too high (above FIT), elevated temperature, and manual frequency exceeding the maximum allowed. Reports on Reddit suggest degradation within two months under these conditions.
You should set your CPU to stock, calculate your FIT, and then adjust accordingly. To determine the voltage, enable PBO and max PPT, TDC, and EDC, and run a worst-case workload. Tools like Prime95 8k fft or AIDA64 CPU FPU are suitable. Your Vcore should match your FIT value.
I don't think I need to worry about that because mine is at exactly 1.3v. I guess I got pretty lucky with the silicon lottery, being able to overclock to 4.4ghz at only 1.3v across all cores. Thing is I haven't manually overclocked the best cores higher either, so it could probably go even further.
When operating above your FIT voltage, performance will exceed Fmax with all cores at 4.4GHz and temperatures between 80-95°C. Expected degradation is likely. If the chip appears capable and passes an AIDA64 CPU FPU test across all cores at 4.4GHz, ensure you remain below your FIT. The typical FIT value is around 1.325 volts; you might be fine at 1.3V, but variations exist between chips. FIT values differ per chip.