So I increased VCore, set CPU Current limit to 140% (doesn't seem to matter) and did several tests using HWinfo at 100 ms refresh interval. Currents listed are read from Asus EC sensor block, not HWinfo's CPU Core Current (SVI2 TFN), which reads 4-5 A higher values. Tctl is well below 70°C with fans running slow (pump is unnerving) in an open chassis.The Stilt said:(on another forum) Most likely you are hitting the TDC limit. That's the most common reason why Ryzen throttles below the MACXFRC.
Results (likely affected by some background tasks):
- Prime95 small FFT does 107 A max and throttles the CPU down to x36 = CPU spec without XFR.
- Prime95 beta small FFT does 104 A max and does not throttle the CPU.
- X264 does 101 A max and does not throttle.
- Y-Cruncher (HNT) does 107 A max and does not throttle.
- Realbench does 98 A max and does not throttle.
- Statuscore does 97 A max and does not throttle.
- IDT/Linpack AVX does 117 A max / average 113 A and does not throttle!
- IDT/Linpack non AVX...
14384 (max) does 110 A max / average 108 A and throttles down to x35.
4096 does 110 A max / average 104 A and throttles down to x35.0.
1024 does 110 A max / average 99 A and throttles down to 34.8.
20 does 109 A max / average ~87.5 A and throttles down to x35.0.
19 does 109 A max / average ~87 A and throttles down to x36.3.
18 does 105 A max / average ~86 A and very occasionally throttles down single cores to x35.8.
1-17 does up to 105 A max / average ~86 A and does not throttle down. This also is the range where memory (controller) related errors don't seem to appear, so it may be a cache size thing.
- Heavyload does 108 A max / average 106 A and throttles down to x33.5! It's private memory footprint is 18 mb.