Question 1

when will the atx 3.1 versions be in stock?

Accepted Answer

Not sure if my first answer went through so I'm gonna try again... I just got this PSU yesterday.  I got the 3.1/5.1 version with the 12v-2x6 cable and PCIE 5.1 female connector (PSU side).  The original TX-1300 read "12VHPWR" on the PSU connector but now reads "PCIE5" and then obviously the 12V-2x6 cable upgrade.  The box and marketing materials all still said 3.0.  I'm sure because Seasonic manufacture their own PSUs that packing and marketing materials should catch up shortly.  I'd wager that if you ordered one now (especially since Newegg is obviously getting ready to restock) that you'd get the 3.1 version since they're now in the U.S.

From Seasonic directly: 
The Seasonic PRIME TX ATX 3.1 Series is built on top of all the great features of PRIME TX platform with added ATX 3.1 and PCIe 5.1 compatibility. Currently the 1600 W and 1300 W units are equipped with native 12V-2×6 connectors, Digital Fan Control, and 105°C-rated Japanese electrolytic capacitors guarantee unwavering power delivery and long-term durability. All these qualities make these power supplies perfect to welcome the newest high power graphic cards and processors on the market.
 
The Seasonic PRIME ATX 3.0 Series power supplies were initially shipped with 12VHPWR cables. Following the update to the ATX 3.1 standard, we began replacing these with the new 12V-2×6 connectors.
During this transition period, customers may receive either 12VHPWR or 12V-2×6 cables in the box. We apologize for any inconvenience this may cause. Please note that availability may vary by region. Here is the planned schedule for the new version availability:
China: Available
Europe: During Q1 2025
North America: During Q1 2025

Question 2

Is this PSU suitable for high powered GPUs like the RTX 5090?

Accepted Answer

Yes, this PSU is suitable for high-powered GPUs like the RTX 5090 as it supports Nvidia RTX 40 Super/50 GPUs and provides a maximum power of 1300W.

Brand	SeaSonic
Model	SSR-1300TR2

Type	ATX 3.1 Compatible
Maximum Power	1300 W
Fans	1 x 135 mm Fluid Dynamic Bearing Fan
Max PSU Length	210 mm
Modular	Full Modular
Energy-Efficient	80 PLUS TITANIUM Certified

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Seasonic PRIME TX-1300, 1300W 80+ Titanium, ATX 3.1 & PCIe 5.1 Ready, Full Modular, ATX Form Factor, Low Noise, Premium Japanese Capacitor, Nvidia RTX 40 Super/50, AMD GPU Compatible, Ref# SSR-1300TR2

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Item#: N82E16817151261