Transient Response
20% Load – 20ms
| Voltage | Before | After | Change | Pass/Fail |
| 12V | 12.181V | 12.023V | 1.29% | Pass |
| 5V | 4.997V | 4.910V | 1.74% | Pass |
| 3.3V | 3.263V | 3.146V | 3.57% | Pass |
| 5VSB | 4.979V | 4.912V | 1.35% | Pass |
50% Load -20ms
| Voltage | Before | After | Change | Pass/Fail |
| 12V | 12.112V | 12.036V | 0.63% | Pass |
| 5V | 4.994V | 4.922V | 1.44% | Pass |
| 3.3V | 3.254V | 3.135V | 3.67% | Fail |
| 5VSB | 4.964V | 4.899V | 1.32% | Pass |
The transient response is good on all rails but 3.3V, where the low nominal voltage leads to a failure in the second test.
Transient Response ATX v3.0 Tests
The PSU successfully passed all ATX v3.0 transient response tests.
The Titan Gold 1200 keeps its 12V rail at a high level during the 200% transient load test, which is the worst.
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My unit has coil whine (more like intermittent chirping) at low loads. As soon as I launch a game or put a 50 – 100w+ load on the system it’s dead silent.
I’ve managed to ‘fix’ it by disabling Intel c6 and c7 states (c1e enabled) and increasing idle GPU clocks from 210/400 to 300/810 MHz using nvidia-smi. If I disable all the c states including c1e I can keep the GPU at stock idle speeds, but I don’t want my CPU at maximum voltage all the time.
The reason this works is because, for whatever reason, the chirping seems to be caused by very low loads on the +12v rail. I’m guessing the PSU is trying to retain gold efficiency across the entire load range on the +12v rail and it struggles at very low loads.
When idling and light browsing at stock settings my CPU consumes 2 – 5w and the GPU consumes 30w. With c6/7 states disabled and higher GPU clocks the CPU consumes 5 – 15w and the GPU consumes 40w. That’s a 20w increase and it’s 100% worth it because the chirping is unbearable without headphones.
specs:
i7 13700k
32GB DDR5 6400MHz
Palit Gamerock RTX 3090 Ti
The resonant tank is usually the culprit at light loads.
I’ve owned many power supplies and this is the first one that exhibits this behavior. There have been reports of it happening on other CWT CSZ based PSUs (TT GF3, NZXT C1200), but it doesn’t seem to be a widespread problem. It’s probably just a bad batch or a small percentage of defective units.
Fortunately it’s easy to fix by slightly increasing idle power consumption.
My unit has also coil whine at low loads and it is so annoying.
Unfortunately coil whine is an issue for most LLC resonant converters, used in modern PSUs.