Corsair SF1000L SFX-L PSU Review

Load Regulation

Test 12V 5V 3.3V 5VSB DC/AC (Watts) Efficiency Fan Speed (RPM) PSU Noise (dB[A]) Temps (In/Out) PF/AC Volts
10% 6.486A 1.969A 1.994A 0.991A 100.018 89.065% 0 <6.0 44.78C 0.967
12.090V 5.079V 3.31V 5.046V 112.293 40.50C 114.91V
20% 13.995A 2.955A 2.993A 1.191A 199.98 91.76% 0 <6.0 45.52C 0.966
12.081V 5.077V 3.307V 5.036V 217.936 40.81C 114.87V
30% 21.864A 3.45A 3.496A 1.393A 300.052 92.366% 535 7.4 41.11C 0.978
12.074V 5.073V 3.303V 5.027V 324.858 46.28C 114.85V
40% 29.704A 3.943A 3.999A 1.595A 399.7 92.352% 806 21.2 41.72C 0.985
12.069V 5.073V 3.301V 5.017V 432.802 47.26C 114.83V
50% 37.205A 4.929A 5.003A 1.798A 499.435 91.986% 1204 34.2 42.29C 0.989
12.066V 5.073V 3.298V 5.007V 542.943 48.27C 114.8V
60% 44.726A 5.915A 6.008A 2A 599.952 90.893% 1751 43.4 42.63C 0.991
12.077V 5.073V 3.296V 4.996V 660.067 48.85C 114.78V
70% 52.234A 6.905A 7.017A 2.207A 699.694 90.231% 1936 45.6 43.41C 0.993
12.072V 5.071V 3.293V 4.986V 775.442 50.43C 114.77V
80% 59.814A 7.895A 8.025A 2.311A 799.717 89.501% 2120 48.3 43.76C 0.994
12.067V 5.069V 3.289V 4.977V 893.533 51.86C 114.74V
90% 67.728A 8.389A 8.519A 2.416A 899.499 88.676% 2314 49.7 44.30C 0.995
12.063V 5.067V 3.287V 4.968V 1014.367 53.43C 114.71V
100% 75.439A 8.884A 9.044A 3.031A 999.532 87.638% 2373 50.4 46.31C 0.995
12.061V 5.067V 3.284V 4.95V 1140.523 56.39C 114.68V
110% 83.080A 9.873A 10.148A 3.036A 1100.146 86.673% 2365 50.4 47.11C 0.996
12.058V 5.066V 3.281V 4.941V 1269.317 58.00C 114.64V
CL1 0.116A 17.818A 18.026A 0A 151.325 83.453% 1772 43.6 42.84C 0.964
12.088V 5.07V 3.306V 5.046V 181.335 48.33C 114.9V
CL2 0.116A 19.73A 0A 0A 101.427 82.91% 1323 36.0 43.61C 0.966
12.096V 5.07V 3.314V 5.059V 122.337 50.65C 114.91V
CL3 0.115A 0A 19.956A 0A 67.383 79.109% 1462 38.8 44.00C 0.947
12.094V 5.083V 3.307V 5.055V 85.179 52.19C 114.91V
CL4 82.905A 0A 0A 0A 999.906 88.645% 2264 49.1 45.94C 0.995
12.061V 5.073V 3.287V 5.009V 1128.006 55.89C 114.69V

Load regulation is tight in general. With 230V, I encountered an issue at 12V (load regulation exceeded 1%), which might only be related to my sample.

Ripple Suppression

Test 12V 5V 3.3V 5VSB Pass/Fail
10% Load 6.9 mV 5.8 mV 5.4 mV 3.1 mV Pass
20% Load 9.2 mV 8.2 mV 7.7 mV 3.3 mV Pass
30% Load 8.4 mV 6.6 mV 6.3 mV 3.5 mV Pass
40% Load 8.6 mV 7.4 mV 6.8 mV 4.2 mV Pass
50% Load 9.0 mV 8.4 mV 7.4 mV 4.8 mV Pass
60% Load 10.6 mV 9.1 mV 9.6 mV 5.6 mV Pass
70% Load 10.3 mV 9.0 mV 8.8 mV 6.2 mV Pass
80% Load 10.6 mV 10.5 mV 10.5 mV 6.8 mV Pass
90% Load 11.4 mV 11.6 mV 10.5 mV 7.1 mV Pass
100% Load 17.8 mV 14.0 mV 11.7 mV 7.7 mV Pass
110% Load 18.5 mV 12.6 mV 12.7 mV 8.1 mV Pass
Crossload 1 12.3 mV 14.5 mV 12.6 mV 12.6 mV Pass
Crossload 2 10.5 mV 10.9 mV 8.0 mV 10.2 mV Pass
Crossload 3 9.5 mV 9.8 mV 9.5 mV 11.4 mV Pass
Crossload 4 16.6 mV 8.4 mV 10.1 mV 9.6 mV Pass

Ripple suppression is good on all rails.

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9 thoughts on “Corsair SF1000L SFX-L PSU Review

  1. Hello, could you please help me choose a PSU, I would like to avoid getting the “new” type 12+4 connector on PSU (I do not like all that possible melting issues), I like what corsair used to do, having used adaptor instead to plug 2x 8 pin connectors to PSU and 12+4 into the GPU but I can not find a “list” of PSU that do not have 12VHPWR on the PSU physically, but rather use 2×8 pin adaptor instead to power high energy GPUs, could you guide me in the right brand to look at in 1000 W PSUs please?

    1. I would like to clarify since I am not sure my first message is clear enough. I would like ATX 3.1 power supply but the type that uses 2x 8 pin connector to power up the 5070 and higher RTX GPUs, not the “modern” 12V-2×6 (or pcie 5.0 or whatever the new plug is called) on both ends (PSU and GPU).

      Some PSUs, like for example Corsair HX1000i does not use the new type connector on PSU side at all – which I prefer after seeing some thermal camera videos of the new cables being way too warm delivering 600 W to 5090s, it rather uses 2x classic 8 pin connector to deliver power to the GPU (GPU cable ends with the new type 12V-2×6 connector).

      And other than checking each PSUs individually, I do not know how to tell if it has or has not the pcie 5.0 or 12V-2×6 on the PSU.

      Models I found that should not have that are Corsair HX1000i (but that one is a bit costly around 260 usd incl. 20% tax at my location) Corsair RM1000x SHIFT (around 215 usd incl. 20% tax) – it should just barely fit my case, I would need to test and see.

      Or I could just forget all that overheated cable info and get FSP Fortron Vita GM 1000 for 135 usd (incl. 20% tax), but then again, “standard” 8 pin connectors are something I would prefer for a PC part that will last me quite a few component upgrades.

      I would greatly appreciate your input.

      Have a nice day

    2. Super Flower PSUs use proprietary connectors as I remember. And some Corsair units too. I don’t remember all I am afraid but you can easily go through my reviews here and check photos.

  2. 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.

    1. 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.

  3. 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!

    1. 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.

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