x370 and 3800x issues involving 4xDIMM RAM
x370 and 3800x issues involving 4xDIMM RAM
Hello, your system has changed significantly. The performance drop you're experiencing might be related to the new CPU and its compatibility with your motherboard. Removing two DIMMs could help, but it's important to check if your current setup supports the upgraded CPU. Also, consider confirming warranty details before proceeding.
It seems you have XMP enabled and it's actually operating at 3200 MHz, which was my initial assumption. For discussion purposes, I’d attempt it with two sticks, ensuring they fit the correct slots. Were you only testing two sticks on the X370 board? I tested on a 5600X using an X570 with 4x8 GB DDR4-3200 CL16, and the results were quite close to yours at 3800X. The slower write speed might stem from using four sticks instead of two.
Zen 2 presents a completely new layout. According to Wikipedia: Zen integrates memory, PCIe, SATA and USB controllers onto the same chip as the processor cores. This offers benefits in bandwidth and power usage, though it increases chip complexity and die size. The architecture shifts to a multi-chip module format where CPU I/O parts are on dedicated chips, referred to as chiplets. https://community.amd.com/t5/processors/...td-p/51401 This outcome is quite normal. The connection between core and IO dies operates at 16B per cycle, resulting in roughly half the bandwidth compared to earlier generations. Additionally, separating IO and core dies adds delay when interacting with RAM, since signals must travel from core to IO die then to memory. All single chiplet Ryzen 3000 series designs share this slower write speed. Double chiplet models (3900X and 3950X) remain unaffected because they use two chips that can exchange data at the same time. In practice, this impact on performance is minimal since the 3000 series doubles its L3 cache to offset memory latency. The system reads and writes to RAM much less often, leading to an overall performance improvement. Edit: @Maquak, verify you have the most recent chipset drivers installed.
I didn't realize about this... after some adjustments everything is working smoothly, even CTR 2.1 functions on my old X370 now. I'm sure my 3800X is a Golden Sample.