Ryzen 9 3900XT
AMD's refreshed Zen 2 twelve-core on AM4, with a higher boost clock than the original 3900X, now a used-market option for multi-core AM4 productivity builds.
We may earn a commission on purchases via this link. It never affects our scores or rankings.
Why we rate it
- Twelve Zen 2 cores for productivity
- Higher boost than the 3900X
- Broad AM4 board compatibility
- Mature and well-understood platform
- Zen 3 5900X is better and similarly priced
- Gaming trails Zen 3 noticeably
Where the Ryzen 9 3900XT wins and loses
Specifications
General info
Cores and threads
Clocks and cache
Power
Watch it in action
Ryzen 9 3900XT vs AMD Ryzen 7 5800X3D
| AMDRyzen 9 3900XTThis page | AMDRyzen 7 5800X3D | |
|---|---|---|
| Overall score | 75 /100 | 75 /100 |
| Core count | 12Better | 8 |
| Thread count | 24Better | 16 |
| Boost clock | 4.7 GHzBetter | 4.5 GHz |
| TDP | 105 W | 105 W |
| L3 cache | 70 MB | 100 MBBetter |
Is the Ryzen 9 3900XT right for you?
If you find a used 3900XT at a clearly low price and need 12 cores for multi-threaded productivity on a budget AM4 system, it gets the job done. A secondary workstation or render node use case.
The Ryzen 9 5900X delivers Zen 3 IPC with better performance in everything for a modest premium on the used market. Unless the 3900XT is significantly cheaper, buy Zen 3 instead.
Before you buy
Only at a very low used price. The Zen 3 5900X is typically available at similar or modestly higher used prices and outperforms it in everything. Buy the 3900XT only if it's clearly cheaper.
The 3900XT is a refined Zen 2 refresh with a slightly higher 4.7 GHz boost versus 4.6 GHz on the 3900X. The performance difference is small in practice. Both are now Zen 2 second-hand options.
No. A decent aftermarket tower cooler or 240mm AIO is needed for the 105W TDP, especially under sustained all-core load.
Yes. All AM4 500-series boards support 5000 series CPUs. On 400-series boards, a BIOS update is needed. The 3900XT is an upgrade stepping stone on AM4 if you want to move to Zen 3 later.
Alternatives & similar cpus
