Question 8-pin PCIE connectors for 7900 XTX

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I am planning to buy Thermaltake GF3 1000w for my 7900 XTX - https://in.thermaltake.com/toughpower-gf3-1000w-gold-tt-premium-edition.html
However it comes with only 2 PCIE connectors with four 6+2 connections, but since one 8pin connector can only power up upto 150w I will be needing a third one which isn't included with the power supply.
I am afraid to use the 2 extra PCIE connectors attached to the 2 main connectors since it is not recommended at all for the high end GPUs, what should I do in this case?
Can I use one of the PCIE connector form my current PSU which is also a 750w 80 plus gold fully modular unit from Antec, I am afraid I can't do that as well since it is not recommended as well.
Should I get a PCIE connector but then again wouldn't it be the same scenario as using the PCIE connector from my current 80 plus gold unit.

 

[Zerk2012]

Can I use one of the PCIE connector form my current PSU which is also a 750w 80 plus gold fully modular unit from Antec

No never do that.
If you need a 3rd cable then buy one that is made to be used with your PSU.

Your PSU manual should say how much power a pigtail cable can put out, my Seasonic said 225 watts using one cable connecting both 6+2 ends.

 

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No never do that.

Yeah that is why I am so confused on what to do, can't seem to find any better options than this particular PSU unit as well.

 

[Zerk2012]

Yeah that is why I am so confused on what to do, can't seem to find any better options than this particular PSU unit as well.

I edited my post read it again.

 

[Native Text]

I edited my post read it again.

It's not mentioned anywhere, not on the website - https://es.thermaltake.com/toughpower-gf3-1000w-gold-tt-premium-edition.html
and not the manual as well - https://file.thermaltake.com/file/qig/TOUGHPOWER_GF3_750_850_1000_1200W_Manual.pdf

However found 2 posts - https://community.thermaltake.com/index.php?/topic/349713-help-with-cables-for-toughpower-gf3-1000w/

Thermaltake GF3 1000, only 2 PCIe cables.

Dear Thermaltake team. First of November I bought the new GF3 1000w. Initially it was for Ryzen 9 5950x + NV RXT 4090, but finaly I am waiting for the RX 7900 XTX from Asus. The new Asus TUF/RoG Strix RX 7900 XTX will have 3 * 8-pin PCIe connectors and if each connector can reach a maximum of 150...

community.thermaltake.com

where they are saying that -
we suggest that you keep your original setting: 1 cable with 1 connection and the 2nd cable with two connections.

When we designed GF3 1000W, we did consider that we will have this situation because of position limitation (we can't put one more 8 pin)

That's why we enhance our 6+2pin cables from 18 AWG to 16 AWG which could afford more watts.

 

[Zerk2012]

It's not mentioned anywhere, not on the website - https://es.thermaltake.com/toughpower-gf3-1000w-gold-tt-premium-edition.html
and not the manual as well - https://file.thermaltake.com/file/qig/TOUGHPOWER_GF3_750_850_1000_1200W_Manual.pdf

However found 2 posts - https://community.thermaltake.com/index.php?/topic/349713-help-with-cables-for-toughpower-gf3-1000w/

Thermaltake GF3 1000, only 2 PCIe cables.

Dear Thermaltake team. First of November I bought the new GF3 1000w. Initially it was for Ryzen 9 5950x + NV RXT 4090, but finaly I am waiting for the RX 7900 XTX from Asus. The new Asus TUF/RoG Strix RX 7900 XTX will have 3 * 8-pin PCIe connectors and if each connector can reach a maximum of 150...

community.thermaltake.com

where they are saying that -
we suggest that you keep your original setting: 1 cable with 1 connection and the 2nd cable with two connections.

When we designed GF3 1000W, we did consider that we will have this situation because of position limitation (we can't put one more 8 pin)

That's why we enhance our 6+2pin cables from 18 AWG to 16 AWG which could afford more watts.

That is usually what they rate it buy wire gauge and how long the cable is.

 

[Native Text]

That is usually what they rate it buy wire gauge and how long the cable is.

Didn't quite get you there, is this safe what they are saying using only 2 PCIE connectors and I can go ahead?

 

[Zerk2012]

Didn't quite get you there, is this safe what they are saying using only 2 PCIE connectors and I can go ahead?

I would do it and not think twice.
That card has a 355 watt TDP might be a bit higher depending on the model.
Even using my power supply as a example.
1 cable with pigtail 225 watts, 1 x 8 pin from the other cable 150 watts, 75 watts from the pci-e motherboard slot, 450 watts.

 

[Native Text]

I would do it and not think twice.
That card has a 355 watt TDP might be a bit higher depending on the model.
Even using my power supply as a example.
1 cable with pigtail 225 watts, 1 x 8 pin from the other cable 150 watts, 75 watts from the pci-e motherboard slot, 450 watts.

420w tdp for the sapphire model, a bit concerned let's say if I am to overclock in future then it won't suffice.

 

[Zerk2012]

420w tdp for the sapphire model, a bit concerned let's say if I am to overclock in future then it won't suffice.

Then buy a different one. Your money your PC.

Amazon.com

 

[mw3theguy]

Any updates on what you decided to do as im bascially in the same boat, like same PSU & Same GPU

 

[Native Text]

Any updates on what you decided to do as im bascially in the same boat, like same PSU & Same GPU

Just go ahead, connect 1 cable with pigtail, 1 x 8 pin from the other cable, 75 watts from the pci-e motherboard slot. I am running my GPU like this with no issues at all.

https://community.thermaltake.com/index.php?/topic/349713-help-with-cables-for-toughpower-gf3-1000w/

where they are saying that -
we suggest that you keep your original setting: 1 cable with 1 connection and the 2nd cable with two connections.

When we designed GF3 1000W, we did consider that we will have this situation because of position limitation (we can't put one more 8 pin)

That's why we enhance our 6+2pin cables from 18 AWG to 16 AWG which could afford more watts.