Ryzen 5900x bei niedriger Spannung optimieren
Ryzen 5900x bei niedriger Spannung optimieren
I have a Ryzen 5900x connected to an Asus B550M motherboard. I'm experimenting with lowering the voltage to save energy and reduce power usage. It's not risky, but I'm trying to optimize performance without the usual performance drop at normal voltages. My board has an Eco mode profile that only allows up to 65 watts. It worked a bit at first when I raised the voltage limit from 87 to 90, but at about half its intended power it felt slower. Now I'm aiming for around 95 watts and want it to run smoothly. At full stock settings, the CPU would draw 150-160 watts under load and stay between 80-85°C. Right now at 65 watts it reaches about 70°C. I’m unsure what the exact numbers mean except that the top value is the maximum power the socket can handle. Can anyone suggest suitable values for the three boxes to reach roughly 95 watts while staying stable? Or explain how tweaking other settings affects things? I'm new to this, so any guidance would be appreciated.
Get the latest AGESA model, which will lower your max voltage from 1.5 to 1.425. Then operate at full stock without adjusting PBO or CO settings. Alternatively, upgrade to a better cooler. I tested it at 235/160/190 with boosting up to 5150 across multiple cores—no temperature issues.
This resource offers a great introduction to fine-tuning adjustments. You can find more details here: https://www.reddit.com/r/overclocking/co...ing_guide/
He mentioned a new cooler mainly because it’s far below what he can handle, well under the available stock, and he’s still displaying a 70°C price.
I checked the newest BIOS yesterday, which should have updated me to the latest AGESA. However, my voltage keeps showing 1.5. I’ll attempt a manual tweak in BIOS and check stability. I found a redit listing the default PBO settings for the 95w eco profile (my board lacks) and adjusted PPT to 120, TDC to 90, EDC to 125a. Then I performed a power curve adjustment of -10 on all cores. My Performance Test score dropped from 39890 at stock settings to 39470. Power consumption decreased from 162W to 126W, and temperatures fell from 85°C to 74°C. That’s nearly matching stock performance with a significant drop in draw. Still, I haven’t run this profile long enough to confirm stability. Overall, it seems okay so far. Edit— I also turned off the ASUS performance enhancement, which would push 200W to the CPU under heavy load and cause temperatures to spike. Also, since my board only has an 8-pin CPU power connector rated for 150W max, I aimed to keep wattage well below that limit for safety.
Cpu power ratings seem mostly meaningless if they actually count. If they did, why would this be possible without the 8-pin just overheating? Also, x58 scales with both voltage and frequency for power consumption, so 1.8V isn't the only factor. I'm not sure of the exact power draw, but these units from around 2008/09 are old, so when overvolting and running fast that high current, expect more than double the 150W 8-pin rating. Plus, designers back then didn't worry about dual 8 pins on XO boards—probably just worked fine. You should focus more on the VRMs on the board; I think a Prime B550M-A or similar might be better, though I don't know the exact model. VRMs are usually lower on prime boards.
Back in my super-noob days, I had a board with a 4-pin cpu power connector and didn't realize it had one. I only had the mobo power connector plugged into the board and ran the computer for years that way. It wasn't until I upgraded that I realized it had this connector and the CPU got its power from somewhere. While I realize that it's 'probably' fine, having real-world experience in almost starting fires by drawing too much power through wires that weren't designed to carry it, I am very conscious of this now.
It looks like that 20-pin connector didn’t fit. You might have a weak processor or an unusual board layout. My 775 model won’t work without the EPS plugged in. Also, I know that ATX connectors on a 20/24-pin motherboard aren’t built to handle high power loads, so trying an older CPU would likely fail.
Apparently it's a 68W model, but these older systems were still mostly using 5V or are they now switching to 12V? If it's still based on 5V, that could explain why the connectors melt at just 68 watts—68 divided by 5 equals about 13.6 amps, which is enough to damage those PSU cables. I think it's the current draw that causes the issue, not the voltage itself. So you could safely connect a 72W device to a PSU rated for 50W using a 6A connector without problems, since it would only be 6A rather than 13A.