Question Looking for a trustworthy EPS to PCI-e adapter

[Leukotriene]

I have an XFX Merc 310 7900 xtx that needs 3 8pin pci-e cables and my psu (Thermaltake Toughpower GF3) only came with 2 8pin pci-e cables, but it has a spare EPS cable and slot.

I'm looking for a safe and reliable EPS to PCI-e female to male adapter.

https://pcpartpicker.com/product/Gt...eon-rx-7900-xtx-24-gb-video-card-rx-79xmercb9

https://pcpartpicker.com/product/ph...-modular-atx-power-supply-ps-tpd-0850fnfagu-4

Additionally, I've seen some that split a single EPS into 2 8pin pcies, is that fine?
I'd only use one of the 2 of course.

 

[Lutfij]

Did you buy the PSU second hand? If I were you, I'd contact Thermaltake and ask them to send you a cable kit for your PSU since the connector didn't come with the PSU(?). I would also see if you can make a custom length of cable/harness for your build. I wouldn't advise on adapters since they are primarily the source/cause of all fires inside a case.

According to this;
https://es.thermaltake.com/toughpower-gf3-850w-gold-tt-premium-edition.html
you should have access to 4xPCIe 8pin connectors, 2 harnesses with a daisychained end.

Additionally, I've seen some that split a single EPS into 2 8pin pcies, is that fine?
If your PSU doesn't have the necessary connectors for your devices you either have:
a| the wrong PSU for the job
or
b| the wrong components for your build.

 

[Leukotriene]

Did you buy the PSU second hand? If I were you, I'd contact Thermaltake and ask them to send you a cable kit for your PSU since the connector didn't come with the PSU(?). I would also see if you can make a custom length of cable/harness for your build. I wouldn't advise on adapters since they are primarily the source/cause of all fires inside a case.

According to this;
https://es.thermaltake.com/toughpower-gf3-850w-gold-tt-premium-edition.html
you should have access to 4xPCIe 8pin connectors, 2 harnesses with a daisychained end.

Additionally, I've seen some that split a single EPS into 2 8pin pcies, is that fine?
If your PSU doesn't have the necessary connectors for your devices you either have:
a| the wrong PSU for the job
or
b| the wrong components for your build.

I purchased it this july, straight from Thermaltake through amazon, got all the cables that it was supposed to have, daisychains and all.

Currently the 3 PCIe 8pin female slots on the gpu are populated by the 2 cables it came with.
The 1st PCIe 8pin female slot on the gpu by 1 cable alone, leaving its other daisychaned end freely dongling.
And the 2nd and 3rd PCIe 8pin female slot on the gpu by the other cable, by using both of the daisychaned ends.

That is the source of my worry.
Since those cables are rated for 150 W (1st link below) and the card and the gpu needs 406-418 W while gaming according to TechPowerUp (2nd link below).
It can take 75 W from the mobo, but then the rest of the 331-ish W is drawn through the 2 cables, that should only give 150 W, on top of it all, it's not evenly distributed, since 1 cable supplies 1 PCIe 8pin female slot on the gpu, and the other supplies 2, thus that 2nd cable (if I understand everything correctly) supplies about 220 W (((406-75)/3)*2), but even if it is distributed evenly, the draw is still about 165 W per cable.
The document on their website clearly states to use 3 separate cables (1st link below).
And since the "component end" of these cables are standardized, I figured I could convert an EPS to PCIe since both use 12V, I understand that sometimes it's incorrectly wired or the wires are thin/bad, that is why I'm asking to see which adapters are reliable.

https://www.techpowerup.com/review/xfx-radeon-rx-7900-xtx-merc-310-oc/37.html

https://file.thermaltake.com/file/qig/Connect_PCIe_Cables_to_High_Power_Consumption_GPU_en.pdf

The cable kit on their website is $60 and I don't really want to purchase a whole kit for a single cable, not to mention the risk of them sending some kit that doesn't match the psu end and i couldn't find an adapter directly sold by Thermaltake.

 

[Lutfij]

The cable kit on their website is $60 and I don't really want to purchase a whole kit for a single cable, not to mention the risk of them sending some kit that doesn't match the psu end and i couldn't find an adapter directly sold by Thermaltake.
They will send you a kit according to the SKU to your PSU, and you verify that by reaching out to them via email. $60 for an entire cable kit to protect a ~$900 GPU is an unbelievable bargain in my books. In hindsight, I contacted Lian-li for cables when I bought a SP850 from them and they were kind enough to send the entire cable kit for free(as I had proof of purchase/serial number). The other option is get cables made custom through custom cable sleevers or Mod-one which has since been rolled into Titan Rig. They deal with MDPC-X gear so that's top of the line but they might cost you a pretty penny. Reach out to them and see what they quote you. Mainframe custom is another reputable outlet.

FYI, I sleeve my own cables as well and use MDPC-X and nothing else.

that is why I'm asking to see which adapters are reliable
You might want to look through our forums and the www, adapters = fires, plain and simple.

 

[--SID--]

A GF3 850w PCIe cable has 16AWG wires to the 1st PCIe connector and 18AWG wires from the 1st to the 2nd connector. 16AWG wires care rated for10A each and 18AWG for7A. One cable has three 12v wires so each cable is rated for 360w. The first PCIe connector on the cable is a HCS type that's rated for 13A each pin (468w for the whole connector). Why HCS: because a standard minifit PCIe connector cannot fit a 16AWG and 18AWG wire. The 2nd PCIe connector is a standard minifit type and rated for 9A each pin.
You see there's nothing to worry about when powering the GPU with 2 cables to 3 connectors.

 

[Eximo]

Another way to consider it is that PSU designers often use the same connectors for EPS and PCIe 8-pin. EPS is rated for 336W.

 

[Leukotriene]

A GF3 850w PCIe cable has 16AWG wires to the 1st PCIe connector and 18AWG wires from the 1st to the 2nd connector. 16AWG wires care rated for10A each and 18AWG for7A. One cable has three 12v wires so each cable is rated for 360w. The first PCIe connector on the cable is a HCS type that's rated for 13A each pin (468w for the whole connector). Why HCS: because a standard minifit PCIe connector cannot fit a 16AWG and 18AWG wire. The 2nd PCIe connector is a standard minifit type and rated for 9A each pin.
You see there's nothing to worry about when powering the GPU with 2 cables to 3 connectors.

That is very useful!
I actually tried to look for that information, but couldn't find it.
Could you tell me where you found it?
The best i got was the manual and the additional pdf about higher powered cards.