F5F Stay Refreshed Hardware Desktop Adjust MCLK and UCLK settings for your 9800X3D with 6600MHz RAM

Adjust MCLK and UCLK settings for your 9800X3D with 6600MHz RAM

Adjust MCLK and UCLK settings for your 9800X3D with 6600MHz RAM

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Flashwing006
Member
217
04-30-2021, 06:26 AM
#1
Checking MCLK and UCLK helps clarify performance. Your setup has a 9800X3D with 2x32GB Corsair Dominator 6600mhz RAM. Initially, MCLK was 3300 and UCLK 1650, which likely caused stability issues. After lowering RAM to 6000, you saw both clocks match at 3000 with FCLK at 2000—this should work for normal operation. If you want 1:1 performance, try running it at 6600 MHz with MCLK and UCLK set to 3300 and 1650 respectively. The BIOS settings might need adjustment for full stability. For gaming, a balanced clock speed usually gives the best experience without overheating.
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Flashwing006
04-30-2021, 06:26 AM #1

Checking MCLK and UCLK helps clarify performance. Your setup has a 9800X3D with 2x32GB Corsair Dominator 6600mhz RAM. Initially, MCLK was 3300 and UCLK 1650, which likely caused stability issues. After lowering RAM to 6000, you saw both clocks match at 3000 with FCLK at 2000—this should work for normal operation. If you want 1:1 performance, try running it at 6600 MHz with MCLK and UCLK set to 3300 and 1650 respectively. The BIOS settings might need adjustment for full stability. For gaming, a balanced clock speed usually gives the best experience without overheating.

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Sheikrik
Senior Member
441
04-30-2021, 07:47 AM
#2
If you're fortunate, achieving stable performance often requires manual adjustments. Setting the SOC voltage to 1.3V can help, though it's unlikely to work if the system won't boot at all. Running in 1:1 mode typically delivers peak performance, even if it means lower clock speeds. For optimal results, aim for 6400MT/s, but you may need to tweak the voltage to 1.3V first. Most processors can handle that speed, though newer models like the Ryzen 9000 might require more effort.
S
Sheikrik
04-30-2021, 07:47 AM #2

If you're fortunate, achieving stable performance often requires manual adjustments. Setting the SOC voltage to 1.3V can help, though it's unlikely to work if the system won't boot at all. Running in 1:1 mode typically delivers peak performance, even if it means lower clock speeds. For optimal results, aim for 6400MT/s, but you may need to tweak the voltage to 1.3V first. Most processors can handle that speed, though newer models like the Ryzen 9000 might require more effort.

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Niclin13
Member
193
04-30-2021, 01:51 PM
#3
I visited BIOS, configured VSOC to 1.3, adjusted speeds to 6400MHz, enabled 1:1 scaling, and installed Windows. I'm a bit worried about setting it to 6600MHz if it fails to boot—I'll have to reset CMOS again. How can I verify if 6400MHz is stable? Should MCLK run at 3200 with UCLK at 3200? Also, is FCLK set to 2000? Thanks!
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Niclin13
04-30-2021, 01:51 PM #3

I visited BIOS, configured VSOC to 1.3, adjusted speeds to 6400MHz, enabled 1:1 scaling, and installed Windows. I'm a bit worried about setting it to 6600MHz if it fails to boot—I'll have to reset CMOS again. How can I verify if 6400MHz is stable? Should MCLK run at 3200 with UCLK at 3200? Also, is FCLK set to 2000? Thanks!

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MooseZachary
Junior Member
28
05-04-2021, 11:49 AM
#4
It's generally safe to clear CMOS, though it can be a minor inconvenience. Once memory tuning is complete, it feels almost automatic. I've found Y-Cruncher performing well during VT3 stress tests, and I'd also like to try TestMem5 for a standard benchmark. The 1usmus preset seems reliable for many users, though different people prefer various tests. Pushing the frequency to around 2133MHz is doable if you're aiming for extra speed, but it's worth stress-testing as well. If you proceed, the stress test will mirror the frequency—just keep music playing and watch for odd interruptions. Unstable FCLK usually leads to subtle glitches rather than full crashes, so listening for those microstutters is the best way to detect issues.
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MooseZachary
05-04-2021, 11:49 AM #4

It's generally safe to clear CMOS, though it can be a minor inconvenience. Once memory tuning is complete, it feels almost automatic. I've found Y-Cruncher performing well during VT3 stress tests, and I'd also like to try TestMem5 for a standard benchmark. The 1usmus preset seems reliable for many users, though different people prefer various tests. Pushing the frequency to around 2133MHz is doable if you're aiming for extra speed, but it's worth stress-testing as well. If you proceed, the stress test will mirror the frequency—just keep music playing and watch for odd interruptions. Unstable FCLK usually leads to subtle glitches rather than full crashes, so listening for those microstutters is the best way to detect issues.