Corsair HX1000 PSU Review

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Transient Response Tests

Advanced Transient Response Tests

For details on our transient response testing, please click here.

Ιn these tests, we monitor the HX1000's response in several scenarios. First, a transient load (10A at +12V, 5A at 5V, 5A at 3.3V, and 0.5A at 5VSB) is applied for 200ms as the PSU works at 20 percent load. In the second scenario, it's hit by the same transient load while operating at 50 percent load.

In the next sets of tests, we increase the transient load on the major rails with a new configuration: 15A at +12V, 6A at 5V, 6A at 3.3V, and 0.5A at 5VSB. We also increase the load-changing repetition rate from 5 Hz (200ms) to 50 Hz (20ms). Again, this runs with the PSU operating at 20 and 50 percent load.

The last tests are even tougher. Although we keep the same loads, the load-changing repetition rate rises to 1 KHz (1ms).

In all of the tests, we use an oscilloscope to measure the voltage drops caused by the transient load. The voltages should remain within the ATX specification's regulation limits.

These tests are crucial because they simulate the transient loads a PSU is likely to handle (such as booting a RAID array or an instant 100 percent load of CPU/GPUs). We call these "Advanced Transient Response Tests," and they are designed to be very tough to master, especially for a PSU with a capacity of less than 500W.  

Advanced Transient Response at 20 Percent – 200ms

Swipe to scroll horizontally
VoltageBeforeAfterChangePass/Fail
12V12.062V12.007V0.46%Pass
5V5.008V4.955V1.06%Pass
3.3V3.294V3.208V2.61%Pass
5VSB4.984V4.953V0.62%Pass

Advanced Transient Response at 20 Percent – 20ms

Swipe to scroll horizontally
VoltageBeforeAfterChangePass/Fail
12V12.063V11.986V0.64%Pass
5V5.008V4.953V1.10%Pass
3.3V3.294V3.190V3.16%Pass
5VSB4.985V4.951V0.68%Pass

Advanced Transient Response at 20 Percent – 1ms

Swipe to scroll horizontally
VoltageBeforeAfterChangePass/Fail
12V12.063V11.990V0.61%Pass
5V5.008V4.944V1.28%Pass
3.3V3.294V3.190V3.16%Pass
5VSB4.985V4.946V0.78%Pass

Advanced Transient Response at 50 Percent – 200ms

Swipe to scroll horizontally
VoltageBeforeAfterChangePass/Fail
12V12.022V11.967V0.46%Pass
5V4.996V4.943V1.06%Pass
3.3V3.283V3.201V2.50%Pass
5VSB4.963V4.930V0.66%Pass

Advanced Transient Response at 50 Percent – 20ms

Swipe to scroll horizontally
VoltageBeforeAfterChangePass/Fail
12V12.022V11.947V0.62%Pass
5V4.996V4.937V1.18%Pass
3.3V3.283V3.181V3.11%Pass
5VSB4.963V4.926V0.75%Pass

Advanced Transient Response at 50 Percent – 1ms

Swipe to scroll horizontally
VoltageBeforeAfterChangePass/Fail
12V12.023V11.949V0.62%Pass
5V4.996V4.943V1.06%Pass
3.3V3.283V3.172V3.38%Pass
5VSB4.963V4.933V0.60%Pass
Image 1 of 5

The +12V rail's response is pretty good, and the same goes for the 5V and 5VSB rails.

Although we don't see large deviations on the 3.3V rail, a low initial voltage allows readings under 3.2V the moment that the transient load is applied. You don't want to observe readings under 3.2V on this rail.

Here are the oscilloscope screenshots we took during Advanced Transient Response Testing:

Transient Response At 20 Percent Load – 200ms

Image 1 of 4

Transient Response At 20 Percent Load – 20ms

Image 1 of 4

Transient Response At 20 Percent Load – 1ms

Image 1 of 4

Transient Response At 50 Percent Load – 200ms

Image 1 of 4

Transient Response At 50 Percent Load – 20ms

Image 1 of 4

Transient Response At 50 Percent Load – 1ms

Image 1 of 4

Turn-On Transient Tests

In the next set of tests, we measured the HX1000's response in simpler transient load scenarios—during its power-on phase.

For our first measurement, we turned the HX1000 off, dialed in the maximum current the 5VSB rail could output, and switched the PSU back on. In the second test, we dialed the maximum load the +12V rail could handle and started the 1000W supply while it was in standby mode. In the last test, while the PSU was completely switched off (we cut off the power or switched the PSU off), we dialed the maximum load the +12V rail could handle before switching it back on from the loader and restoring power. The ATX specification states that recorded spikes on all rails should not exceed 10 percent of their nominal values (+10 percent for 12V is 13.2V, and 5.5 V for 5V).

Image 1 of 3

There is a tiny voltage overshoot at 5VSB, which is nothing to worry about. The +12V rail takes some time until it settles down in both tests. The results aren't bad, but also not ideal.


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Aris Mpitziopoulos
Aris Mpitziopoulos
Contributing Editor

Aris Mpitziopoulos is a contributing editor at Tom's Hardware, covering PSUs.

14 Comments Comment from the forums
  • samer.forums
    Can any one explain to me why we need such high end expensive power supplies for PCs ?

    I Overclock my PC fully , and I moved from (seasonic) Bronze grade power supply to Tier one expensive Titanium power supply and I did not gain anything in real life , nothing, Zero. the same performance and the same electric bill and both power supplies never failed.

    Sure the better power supply on paper will give better results .. but they are way above the requirement of the PC hardware.

    Reply
  • turkey3_scratch
    20248574 said:
    Can any one explain to me why we need such high end expensive power supplies for PCs ?

    I Overclock my PC fully , and I moved from (seasonic) Bronze grade power supply to Tier one expensive Titanium power supply and I did not gain anything in real life , nothing, Zero. the same performance and the same electric bill and both power supplies never failed.

    Sure the better power supply on paper will give better results .. but they are way above the requirement of the PC hardware.

    Overclocking the CPU is mostly dependent on the motherboard. It can be helped by having a better PSU, because in turn that makes it easier on the motherboard, but I wouldn't expect any major gains from getting a new power supply. I think it also depends on how much your CPU can overclock. People who are really pushing their CPUs to the maximum, they won the lottery and are really pushing it, they may benefit from a better PSU.

    Your electric bill is only going to change depending on a lot of factors. Air conditioning and home appliances are going to take up 90% of your electric bill, and because the percentage of that bill making up your computer is so small it can almost be ignored at times. The change is so small that it is not distinguishable between your other household appliances most likely.

    And getting a good PSU is not just for trying to help overclocking; a PSU with good performance will usually increase the lifespan of the rest of the computer, and one with bad performance will decrease the lifespan of the hardware. So if you plan on having your computer for many many years a good PSU is a good idea. If you plan on swapping parts every 1-2 years then PSU performance may be a lot less important to you.

    Still, expensive PSUs have better build quality so the PSUs themselves are going to last longer, and if they're designed properly like this one they can be very quiet. Cheap PSUs can be loud.
    Reply
  • dstarr3
    20248805 said:
    20248574 said:
    Can any one explain to me why we need such high end expensive power supplies for PCs ?

    I Overclock my PC fully , and I moved from (seasonic) Bronze grade power supply to Tier one expensive Titanium power supply and I did not gain anything in real life , nothing, Zero. the same performance and the same electric bill and both power supplies never failed.

    Sure the better power supply on paper will give better results .. but they are way above the requirement of the PC hardware.

    Overclocking the CPU is mostly dependent on the motherboard. It can be helped by having a better PSU, because in turn that makes it easier on the motherboard, but I wouldn't expect any major gains from getting a new power supply. I think it also depends on how much your CPU can overclock. People who are really pushing their CPUs to the maximum, they won the lottery and are really pushing it, they may benefit from a better PSU.

    Your electric bill is only going to change depending on a lot of factors. Air conditioning and home appliances are going to take up 90% of your electric bill, and because the percentage of that bill making up your computer is so small it can almost be ignored at times. The change is so small that it is not distinguishable between your other household appliances most likely.

    And getting a good PSU is not just for trying to help overclocking; a PSU with good performance will usually increase the lifespan of the rest of the computer, and one with bad performance will decrease the lifespan of the hardware. So if you plan on having your computer for many many years a good PSU is a good idea. If you plan on swapping parts every 1-2 years then PSU performance may be a lot less important to you.

    Still, expensive PSUs have better build quality so the PSUs themselves are going to last longer, and if they're designed properly like this one they can be very quiet. Cheap PSUs can be loud.

    That explains why one would buy high-quality PSUs, sure. But it doesn't explain why one would buy such high-wattage PSUs. Buying a 1000W PSU isn't going to benefit your machine if it only needs 500W on full load.

    Now that 3- and 4-way SLI is on the outs, I can only assume it's just the miners that need so much wattage anymore.
    Reply
  • turkey3_scratch
    20248811 said:
    That explains why one would buy high-quality PSUs, sure. But it doesn't explain why one would buy such high-wattage PSUs. Buying a 1000W PSU isn't going to benefit your machine if it only needs 500W on full load.

    Now that 3- and 4-way SLI is on the outs, I can only assume it's just the miners that need so much wattage anymore.

    Well you could take two overclocked 1080Tis, together those can be about 500W. Then if you have one of Intel or AMD's highest-end CPUs overclocked really well, that can be up to 150W probably if they have really good overclocks. Account for other stuff, probably around 725W under load. So in this case some people may buy a 1000W PSU, I don't know. But yeah, I see very few instances where someone would need one.

    And some people do believe that buying a bit higher of a wattage will help it last longer. Whether true or not probably depends on a lot of factors like how the fan behaves and efficiency and other stuff.

    But usually I like to get a PSU with better build quality and lower wattage than one with slightly less good build quality and higher wattage.
    Reply
  • padrescout
    It's the same reason Johnny Everyman buys a Dodge Hellcat. Nobody needs a 700 horsepower car to tool around town in. But some people like the image of having it. It implies things without saying anything and generally reflects positively on the owner in their social tribe.

    But mostly because a lot of people have more money than brains.
    Reply
  • turkey3_scratch
    20249162 said:
    It's the same reason Johnny Everyman buys a Dodge Hellcat. Nobody needs a 700 horsepower car to tool around town in. But some people like the image of having it. It implies things without saying anything and generally reflects positively on the owner in their social tribe.

    But mostly because a lot of people have more money than brains.

    Assuming everybody buys something for the same reason isn't very reasonable.
    Reply
  • samer.forums
    20248805 said:
    20248574 said:
    Can any one explain to me why we need such high end expensive power supplies for PCs ?

    I Overclock my PC fully , and I moved from (seasonic) Bronze grade power supply to Tier one expensive Titanium power supply and I did not gain anything in real life , nothing, Zero. the same performance and the same electric bill and both power supplies never failed.

    Sure the better power supply on paper will give better results .. but they are way above the requirement of the PC hardware.

    Overclocking the CPU is mostly dependent on the motherboard. It can be helped by having a better PSU, because in turn that makes it easier on the motherboard, but I wouldn't expect any major gains from getting a new power supply. I think it also depends on how much your CPU can overclock. People who are really pushing their CPUs to the maximum, they won the lottery and are really pushing it, they may benefit from a better PSU.

    Your electric bill is only going to change depending on a lot of factors. Air conditioning and home appliances are going to take up 90% of your electric bill, and because the percentage of that bill making up your computer is so small it can almost be ignored at times. The change is so small that it is not distinguishable between your other household appliances most likely.

    And getting a good PSU is not just for trying to help overclocking; a PSU with good performance will usually increase the lifespan of the rest of the computer, and one with bad performance will decrease the lifespan of the hardware. So if you plan on having your computer for many many years a good PSU is a good idea. If you plan on swapping parts every 1-2 years then PSU performance may be a lot less important to you.

    Still, expensive PSUs have better build quality so the PSUs themselves are going to last longer, and if they're designed properly like this one they can be very quiet. Cheap PSUs can be loud.

    I never had any power supply fails all my life ... last time I changed a power supply was for low voltage haswell issue and not because my old one died.

    Even one of my Plus 80 (below bronze) powersupply lasted 7 years without any issues, I only buy Seasonic by the way and Corsair.

    and for motherboards parts , they never failed as well

    Life span is not a big deal when you buy a good brand that follow the standard specifications for the pc parts.

    I still need a valid reason to convince me that buying an expensive powersupply is better in real life and not on paper.
    Reply
  • turkey3_scratch
    The original Seasonic-made Corsair HX power supplies from 2008, i.e. one like this, had RMA rated above 10% they were so unreliable (I received this info on the Jonnyguru forums a while back). So really you can't just go by brand. And you may have not had failures personally, but other people have. Personal experience does not dictate the broader spectrum.
    Reply
  • samer.forums
    20249230 said:
    The original Seasonic-made Corsair HX power supplies from 2008, i.e. one like this, had RMA rated above 10% they were so unreliable (I received this info on the Jonnyguru forums a while back). So really you can't just go by brand. And you may have not had failures personally, but other people have. Personal experience does not dictate the broader spectrum.

    I am not talking about fail rate . I am talking about what I get for paying for high end powersupply and I want to see if they are overkill and not needed at all or not. fail rate is something else. you can get a cheap Bronze powersupply with low fail rate .
    Reply
  • Larmo-Ct
    For "future proofing", I always buy 1200 Watt PSUs.. As Tim the "Tool Man Taylor" in the old Home Improvement TV show, use to say.. "Mooore poowwerr!! Awh.. Awh..!" :-)
    Reply