The Ryzen Threadripper 3990X eats up power, but not nearly as much as we expected, at least at stock. We saw total system power go to around 370W, with the CPU pulling about 300W. We noticed that AMD achieved this by greatly reducing the core voltage, so we were pulling a bit over 300A at less than 1v. HOWEVER, look below to see what happens when we enable PBOC; hint, the system power went over 1000W.
As of now, we are not going to be overclocking the 3990X, enabling Performance Boost Overdrive fed the CPU up to 800W easily, if not higher. Core voltages went as high as 1.45v from less than 1v at stock, and total system power consumption increased almost more than three times.
However, if you look at the performance increase in CINEBENCH between the CPU at stock and with PBOD enabled (with XMP of course), we see some crazy results. Whether or not this increase in power is worth the extra performance, you will need a 1kw PSU to take full advantage of this CPU.
You will also need a solid TRX40 motherboard to enable XMP up to 3600MHz with four 16GB dual-rank kits. AMD told us only one motherboard did it by just enabling XMP out of the box; others need manual tweaking. Officially AMD only supports up to 3200MHz with 4x16 GB dual-rank DIMMs, so this is over their limits.
Last updated: Apr 7, 2020 at 12:34 pm CDT
- Page 1 [Introduction, Specifications, and Pricing]
- Page 2 [The CPU and Test Setup]
- Page 3 [CINEBENCH, wPrime, and AIDA64]
- Page 4 [Blender, Handbrake, ScienceMark, and SuperPI]
- Page 5 [UNIGINE and 3DMark]
- Page 6 [Gaming]
- Page 7 [Overclocking and Power Consumption]
- Page 8 [What's Hot, What's Not & Final Thoughts]