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CPU Benchmarks

Over 1,000,000 CPUs benchmarked

AMD Ryzen 9 3900XT vs Ryzen 9 7900

The AMD Ryzen 9 7900 is newer than AMD Ryzen 9 3900XT also around 33% faster in multi-threaded (CPU Mark) testing, it is around 34% faster in single-thread testing. However, AMD Ryzen 9 3900XT uses around 47% more power. All the CPUs in this comparison belong in the Desktop CPU Class.The values below were tabulated from a combined 3055 benchmarks submitted from our PerformanceTest software and results and are updated daily to include new submissions.

  • The first section will show basic information for each CPU selected.
  • The additional graphs shows the CPU Mark and Single Thread values of each CPU selected.
  • An accompany graph, if price data is available, will shows the value for money, in terms of the CPU Mark/Thread Rating per dollar.
  • The last section will show approximate yearly running costs for the CPUs.

×AMD Ryzen 9 3900XT×AMD Ryzen 9 7900+ ADD
Price $375 - BUY $385.41 - BUY
Socket TypeAM4AM5
CPU ClassDesktopDesktop
Clockspeed3.8 GHz3.7 GHz
Turbo SpeedUp to 4.7 GHzUp to 5.4 GHz
# of Physical Cores12 (Threads: 24)12 (Threads: 24)
CacheL1: 768KB, L2: 6.0MB, L3: 64MBL1: 768KB, L2: 12.0MB, L3: 64MB
TDP105W65W
Yearly Running Cost$19.16$11.86
OtherAMD Radeon Graphics
First Seen on ChartQ3 2020Q1 2023
# of Samples13701685
CPU Value86.9125.9
Single Thread Rating(% diff. to max in group)2742(-33.8%)4141(0.0%)
CPU Mark(% diff. to max in group)32602(-32.8%)48541(0.0%)

CPU Mark Rating
As of 6th of April 2025 - Higher results represent better performance
AMD Ryzen 9 3900XT
32,602
AMD Ryzen 9 7900
48,541
PassMark Software © 2008-2025
CPU Value (CPU Mark / $Price)
As of 6th of April 2025 - Higher results represent better value
AMD Ryzen 9 3900XT
86.9
AMD Ryzen 9 7900
125.9
PassMark Software © 2008-2025
CPU Single Thread Rating
As of 6th of April 2025 - Higher results represent better performance
AMD Ryzen 9 3900XT
2,742
AMD Ryzen 9 7900
4,141
PassMark Software © 2008-2025
Estimated Energy Usage Cost
Estimated Energy Adjustable Values
Average hours of use per day Average CPU Utilization (0-100%)1 Power cost, $ per kWh2
8
25
1Average user usage is typically low and can vary from task to task. An estimate load 25% is nominal.
2Typical power costs vary around the world. Check your last power bill for details. Values of $0.15 to $0.45 per kWh are typical.
AMD Ryzen 9 3900XT AMD Ryzen 9 7900
Max TDP105W65W
Power consumption per day (kWh)0.210.13
Running cost per day$0.052$0.033
Power consumption per year (kWh)76.647.5
Running cost per year$19.16$11.86
Shown CPU power usage is based on linear interpolation of Max TDP (i.e. max load). Actual CPU power profile may vary.