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How Many Cores Do AMD Ryzen 9 3900 CPUs Have?

Find out how many cores AMD's Zen 2-based Ryzen 9 3900 processors have.

Motherboard Timur Garifov / Unsplash

Last Updated: June 13, 2022

Written by Kevin Jones

In addition to discussing the number of cores in the 3900, this article will discuss recommendations for compatible CPU coolers and memory.

Check another CPU:

Important considerations regarding this CPU:

The Ryzen 9 3900 is an OEM-only CPU, meaning that it is only available in pre-built computers. You can't purchase a boxed or tray version of it.

How Many Cores Do 3900 CPUs Have?

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AMD's Ryzen 9 3900 CPUs have 12 cores. The processor has a 3.1 GHz base frequency and supports a 4.3 GHz max boost frequency.

How Many Threads Does the 3900 Have?

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The AMD Ryzen 9 3900 has 24 threads. The processors provide two threads for each of the 12 cores.

At What Frequency Does the 3900 Run?

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The processor has a 3.1 GHz base frequency and supports a 4.3 GHz max boost frequency.

What Does the Lack of a Suffix in the 3900 Name Mean?

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The 3900 model name doesn't have a G suffix. Non-G CPUs do not contain integrated graphics, and a separate graphics card is required.

CPU Cooling for the 3900

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A CPU cooler's TDP (Thermal Design Power) rating indicates how much heat it can dissipate in watts. If the cooler can't keep your CPU cool enough, your CPU may throttle (slow down), and your cooler will constantly run at full speed.

AMD CPU specifications indicate this power dissipation number as "TDP."

The Ryzen 9 3900 has a TDP of 65 watts.

A CPU cooler can still work with a lower TDP rating than the TDP of a CPU. However, the CPU will eventually throttle itself to a lower frequency to allow itself to cool.

The CPU may not achieve or maintain maximum boost speeds without adequate cooling.

Learn more in What is the Best Type of CPU cooler for a Gaming PC?

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Best AIO Liquid Cooler: Enermax Liqmax III 360

  • This Enermax liquid cooler has an excellent cooling capability with a 360-watt TDP (Thermal Design Power).
  • Supports a variety of CPU sockets, including Intel LGA 2066, 2011-3, 2011, 1700, 1200, 1366, 1156, 1155, 1151, 1150 and AMD AM4, AM3+, AM3, AM2+, AM2, FM2+, FM2, FM1.
  • Quiet operation at 14-27 dBA.
  • Make sure your computer case dimensions support this, as it will take up a decent amount of space! Enermax Liqmax III 360 Enermax Liqmax III 360 Check Price on Amazon Amazon Affiliate Link

Best Dual-Fan Air CPU Cooler: Noctua NH-D15

  • Dual 140 mm fans provide 220-watt TDP (183 NSPR) of cooling capability.
  • Supports a variety of CPU sockets, including Intel LGA 1700, 1200, 1156, 1155, 1151, 1150, 2011, 2066 and AMD AM4, AM3, AM3+, AM2, AM2+, FM2, FM2+.
  • Quiet operation at 24.6 dBA. Noctua NH-D15, Premium CPU Cooler Noctua NH-D15, Premium CPU Cooler Check Price on Amazon Amazon Affiliate Link

Runner Up - Dual-Fan Air CPU Cooler: Thermaltake TOUGHAIR 510

  • This CPU cooler doesn't have any fancy LED lights, but the dual 120 mm fans do a great job of cooling AM4 CPUs.
  • Supports a variety of CPU sockets, including Intel LGA 1700, 1200, 1156, 1155, 1151, 1150 and AMD AM4, AM3, AM3+, AM2, AM2+, FM2, FM1.
  • Suppose you think this cooler will take up too much space. In that case, Thermaltake has a few single-fan TOUGHAIR variants which use different orientations.
  • This CPU cooler has a 2000 RPM max speed for optimal cooling.
  • 180-watt TDP (Thermal Design Power). Thermaltake TOUGHAIR 510 Thermaltake TOUGHAIR 510 Check Price on Amazon Amazon Affiliate Link
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Before purchasing memory, review your motherboard specification to verify which speeds are supported. For example, if a DDR4 motherboard stated that it supports "DDR4 3400(O.C.) / 3333(O.C.) / 3300(O.C.) / 3200 / 3000," that would mean that it could support DDR4-3400, DDR4-3333, and DDR4-3300 with memory overclocking, and DDR4-3200 and DDR4-3000 at stock speeds. Motherboard specifications also indicate the maximum capacity per stick of RAM (DIMM) and across all slots.

Learn More About the AMD Ryzen 9 3900

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Other Considerations When Building a PC

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Want to brush up on other new technologies to consider when building a computer? Check out these articles: