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AMD Ryzen 7000/7000X3D CPUs are Slower with DDR5-7400 Memory in Gaming

The other day, AMD rolled out a new AGESA update that significantly boosts memory overclocking performance. Users have already reported overclocks of up to 8,200 MT/s using the new BIOS, and that too on budget hardware. Quasarzone tested the Ryzen 7 7800X3D and the Ryzen 9 7950X using high-speed memory on the new BIOS and got some interesting results:

When using the faster DDR5-7400 memory with the memory controller set in a 1:2 configuration (can’t be clocked higher than 6,200), the gaming performance is slightly lower than before. This boils down to the memory controller clocks. In 6,200 MT/s mode, the memory controller runs at the same clock as the main memory, thereby improving latency. Switching to 7,400 MT/s requires setting the controller to half the frequency, as 6,000 MT/s is the official upper limit.

We see similar results with the Ryzen 9 7950X. The deltas are within the margin of error, but most games are faster in the 6,200 MT/s 1:1 mode. We are essentially back to the early problems of the Infinity Fabric, although the severity is much less. Due to the 6,000 MT/s clock limit of the fabric/memory controller, getting a higher memory clock won’t benefit gamers unless you’ve got a golden chip whose MC can be overclocked to 7,000 MT/s or higher.

Areej Syed

Processors, PC gaming, and the past. I have been writing about computer hardware for over seven years with more than 5000 published articles. Started off during engineering college and haven't stopped since. Mass Effect, Dragon Age, Divinity, Torment, Baldur's Gate and so much more... Contact: areejs12@hardwaretimes.com.
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