Epilogue
The Seasonic TX-1300 ATX 3.0 is a super expensive and top-performing PSU, featuring equally high build quality and an extra-long warranty period, reaching twelve years, supporting it. When you buy such an expensive PSU, you don’t spend money. You invest them in something that will last for many system builds, passing unnoticed since it won’t bother you. With a good PSU, you make sure that power delivery is smooth, and in the majority of PC problems, power is usually the main culprit, so having that out of the equation will make your life easy in case you face a problem.
Besides top transient response at 12V, the most important rail, sky-high efficiency, low ripple, and high power levels, the TX-1300 is also super quiet! It is one of the quietest high-power units I have tested. The use of large heatsinks and the Titanium efficiency help in that. Moreover, regarding its efficiency certification, I noticed this unit is close to the Cybenetics Diamond rating at 115V. So far, after more than six years since the Diamond level’s requirements were introduced, no manufacturer has met them. I would love to see someone finally introducing a Diamond PSU since Titanium has been around for too long, and we need to step up the game!
Although the 5VSB rail’s efficiency is among the highest I have measured so far, and 115V standby power is dead low, at 230V, the standby power is a bit above 0.1W. I want to see it below that threshold. In such an expensive and high-end product, I am super picky! Also, the APFC converter needs tuning for higher performance, especially at 230V. Since 230V ratings are not as popular as 115V ones, manufacturers don’t pay great attention to the APFC converter’s performance at 230V, resulting in not-high PF readings. I will keep emphasizing that until PF gets higher at this voltage level. Power factor affects power consumption, so it needs to be as high as possible. Lastly, I know that the 3.3V rail won’t see much action, especially at high loads, but still, I don’t want to see below 3.2V levels once I hit it with a transient load.
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I noticed a voltage drop at 12V during one of the turn-on transient response tests. I should note that I don’t include all tests I conduct in my reviews, or else the reviews would reach 30 pages, but once I spot a problem, I mention it, including the relevant screenshots. As you can see in the above scope shots, the waveforms in the first and third tests are good, but there is an evident problem in the second. Applying a full load the moment you switch one of the PSUs through its power switch is not the most realistic scenario, but from the moment the ATX spec requires it, I have to do it, and the PSU has to comply, too. The same issue was present in the TX-1600 unit and less severe in the PX-1600.
Overall, the Seasonic TX-1300 is a great performing PSU, worthy of a recommendation.
To check all alternative PSU offerings, read my Best ATX v3.x PSUs article before investing in a new power supply. You help me a lot by using my affiliate links, which don’t increase the product’s price. I get a commission from Amazon every time you do it, which can make a difference for me, especially now that I am on my own, working exclusively for my media and not for someone else.
- Delivered full power at 47°C
- ATX v3.0 and PCIe 5.0 ready
- High build quality
- Top overall performance
- Silent operation
- Sky-high average efficiency
- Higher than 70% efficiency with a 2% load
- Highly efficient 5VSB rail
- Low vampire power with 115V input
- Within 1% load regulation
- Good ripple suppression
- Top transient response at +12V
- Good transient response at 5V
- Long hold-up time
- Long and accurate power ok signal
- Alternative Low Power Mode (ALPM) compatible
- Fully modular
- Plenty of connectors, including a 12VHPWR (600W)
- Enough distance (125-155mm) between peripheral connectors
- FDB fan
- Twelve-year warranty
- High OCP triggering point at 3.3V
- Low power factor
- Voltage sag during the “Off to Full Load Turn-on” transient response test
- High inrush current at 230V
- An additional 4-pin Molex would be ideal
- Huge dimensions
Hello, back here where it all began!
Following this wonderful guide, I purchased the aforementioned beast. I’ve had it for 6 months now and I can confirm the splendid features in terms of efficiency but above all it is totally silent.
However, with the release of the ATX 3.1 standards, I ask at this point if it is compatible with the new 3.1 and if the cable will be suitable for a hypothetical 5000 series GPU.
Thank you
Hi! The cable remains the same, so it will be compatible with 5000 series, given that Nvidia won’t change the connector on its own again (which I doubt)
Okay, thanks for the reply! So there are no good reasons to change it with a PSU with ATX 3.1 and PCIe 5.1 standards like the 1600 Noctua edition?
Aris, have you noticed any weird noise when the PSU fan starts or stops? Or erratic fan behavior in this unit?
My Seasonic Prime PX-750 had the fan start up and stop constantly while I was gaming. The fan itself was quiet but I could hear a weird rattling noise for one second as the fan started or stopped. This also sometimes happened at idle.
Are u sure it was the fan?
100% sure. It would happen when I switched Hybrid mode on and off. There was nothing rattling around in the PSU, nothing was stuck in it.
Alright, update. No such noises coming from this PSU’s fan, just as advertised on this review, it is extremely silent. I was shocked at how silent it was. Normal behavior both in hybrid and always on mode. I keep my fan always running.
I see all your expensive testing equipment push to the limits but please no 30 pages ahah.
This PSU is gorgeous, look amazing for the people with a pc case showing it on the side/bottom. Some luxury sport car with the chrome look.
Breaded cables very nice. It’s a personnal pref but downside they are 60-75cm ! I built a few mid-tower pc and i never needed more than 50cm for the ATX and GPU. Big hassle to hide all this extra ;(
510€~ on Amazon for this monster, if i was not beyond the return window for my own PSU i would be tempted.
I snatched a MSI MEG AI1300P for 279€ with the MSI Cashback/Review. Decent for platinum 1300w. I like the fact that the fan control is possible with msi center and usb mobo. Plus it’s start running auto by default only when it’s 65°C i believe.
I highly recommend setting the PSU to the minimum fan RPM of 700. You don’t need the MSI software to keep running after you set it.
I have this PSU and in my opinion, the fan starts way too late. I don’t like the amount of heat the PSU puts out, so I left mine running like specified above, and the PSU never heats up past 48C even during intense gaming (4090 and 14900K).
I will replace it with this Seasonic Prime TX-1300 unit in a bit, though. Only reason I got this MSI was because Seasonic had no ATX 3.0 units at the time. I always feel more comfortable with Seasonic in my rig – not to say the MSI is bad, far from it. It’s a very high quality unit. I’m just a Seasonic kinda gal.
Thank u for your input.