Transient Response
20% Load – 20ms
| Voltage | Before | After | Change | Pass/Fail |
| 12V | 12.069V | 11.985V | 0.70% | Pass |
| 5V | 5.068V | 4.980V | 1.74% | Pass |
| 3.3V | 3.305V | 3.219V | 2.59% | Pass |
| 5VSB | 5.041V | 4.999V | 0.84% | Pass |
50% Load -20ms
| Voltage | Before | After | Change | Pass/Fail |
| 12V | 12.059V | 11.992V | 0.55% | Pass |
| 5V | 5.064V | 4.980V | 1.66% | Pass |
| 3.3V | 3.296V | 3.206V | 2.72% | Pass |
| 5VSB | 5.015V | 4.972V | 0.87% | Pass |
Transient response is good on all rails, especially at 12V, where it matters the most.
Transient Response ATX v3.0 Tests
The PSU successfully passed all ATX v3.0 transient response tests.
The SF1000L achieves the highest voltage in its 12V rail during the 200% transient response test, which is the toughest of all.
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Can your reviews add coil whine testing… Certain loads with coil whine Dba test results or something. I found all the Corsair PSUs appear to have some coil whine under load. Asus Loki apparently has as much if not more coil whine. Apparently Seasonic PSUs have less coil whine but a lot of complaints about fan noise (I replace fans in my PSUs) :P. I do like the Corsair PSUs, I build for silence so coil whine under load conditions defeats this goal.
Actually most complain for coil whine in the seasonic Vertex. We do test for coil whine but the fact is that we only get 2 samples per unit. If we notice coil whine we mention that in the reviews.
Another excellent review, Aris – thank you! It’s safe to say that I wouldn’t even consider buying a PSU without your thorough review. I do wonder though, I noticed that the unit is actually Platinum rated according to:
https://www.clearesult.com/80plus/sites/80plus/files/manufacturer-certificate/CORSAIR_RPS0156%20%28CP-9020246%29%20%28SF1000L%29_1000W_SOCE%206912_Report.pdf
Perhaps this was a marketing choice by Corsair, but even so, an odd one!
I’m currently torn between the Corsair SF1000L (noise isn’t a concern as long as the fan does its job), the Thermaltake Toughpower 1000W, and the ROG-Loki. However, I’m hesitant about the ROG-Loki due to reported coil whine issues. If you could only recommend one SFX-L 1000W+ PSU, which would you choose (even if not listed)?
Thanks in advance for your insights!
It is Platinum in Cybenetics, because of the different methodology that it uses compared to 80 P.
I don’t have an Asus Loki review sample so far and this troubles me. Asus marketing in general is so so, rarely sending out review samples.
I would go for the Corsair SFX-L. Currently it is the best option, especially if you don’t care about noise at high loads.
Thank you very much Aris – I’ve gone with the SF1000L!
Glad I helped!