this post was submitted on 17 Oct 2023

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XFX 7900xtx power cable question (sh.itjust.works)

submitted 1 year ago by [email protected] to c/pcmasterrace

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Hello gamers, this bad boy arrived today and it's the first time I've encountered 3 PCIe power slots. I'm familiar with using 1 cable and using the daisy chained 8 pin to handle the 2 slots. Since my Gigabyte 80+ G 1000W came with 3 of these PCIe cables I'm assuming this setup is correct? I'm probably needlessly worrying that I'll brick this.

To be exact, each cable is an 2+6 pin into the PSU while the opposite end is 2 (daisy chained) 2+6 pins. My worry is rooted in not being familiar with the daisy chained bits importance.

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[–] Kumabear 8 points 1 year ago* (last edited 1 year ago) (2 children)

Please as much as your power supply allows you to do so, do NOT daisy chain them on a high end modern GPU.

Use dedicated cables from the power supply for each of the 8 pins where ever possible even if it means a little more cable clutter.

Also not to scare you or whatever but I would personally avoid using a gigabyte power supply if you can at all avoid it.

https://youtu.be/7JmPUr-BeEM?si=Nu2NP-k5LpGcHXWc

Power supplies are the heart of your computer, while I understand it can be a sad thing to have to spend good money on, potentially limiting the amount you have to spend on more fun parts like cpus and gpus. It really is worth it in the long run. A good power supply will usually get me through 3 seperate builds and still be under warranty for the start of the third one.

I’d recommend something from be-quiet or from superflower as good options that are fairly affordable at least in my market tho mileage might vary.

Other good choices are Seasonic, and the upper mid range and higher Corsair (HX and up)

[–] [email protected] 3 points 1 year ago

Wow I wasn't aware of gigabyte's exploding PSUs, thanks! I haven't seen any reports on my particular one (UD1000GM) having issues aside from noise (mine however seems quiet). So I'll be chancing it for the mean time while keeping an eye on the market for a safer reliable replacement. I wasn't aware of gigabytes awful reputation 😅

[–] ichik 1 points 1 year ago* (last edited 1 year ago) (1 children)

Is this really such a big of a concern? I just built a new system recently with 7900 XTX and Corsair RM850x as a PSU, and it came with only 2 PCIe cables with daisy-chain ends (ridiculous amount of SATAs though for some reason), so one of the connectors on the GPU is currently using that. Should I shell out for an extra cable? Corsair ones are ridiculously overpriced where I'm at, €23 for a single one.

[–] Kumabear 1 points 1 year ago (1 children)

If the card pulls more than 300w I personally wouldn’t be using a daisy chain.

You will probably still be fine on a card with three plugs across two cables.

It’s worse on cards with two plugs, like some of the 3090 and 3080 cards. That use 400+ w of power.

[–] ichik 1 points 1 year ago (1 children)

I shelled out just to be sure (bought cables with two ends though, since they're for some reason cheaper than single connector ones — makes cable management a bit messier). I haven't seen it to pull more than 200w so far though, although the only game I've been testing it with was Elden Ring which is admittedly not the most demanding one (even in 4k with everything maxed).

[–] Kumabear 1 points 1 year ago* (last edited 1 year ago)

The game I have found that pushes power use the hardest for testing real world cooling and power on video cards, is Metro exodus enhanced. (Awesome game also which is worth the bug anyway)

It consistently uses nearly 80-100w more than anything else I have seen.

Pushed my modded and watercooled 3090 to 600w at which point the power limit I set there held it. Even at 600w it’s power limiting down nearly 80mhz below normal full load clocks.

[–] [email protected] 5 points 1 year ago

Nothing wrong with using individual cables. Theoretically, there isn't a problem with using the daisy chained connector unless you're really sucking down a lot of power. I've always used individual cables just to be safe.

[–] [email protected] 3 points 1 year ago (1 children)

Holy sh*t that thing's massive 😳

[–] [email protected] 4 points 1 year ago

Absolutely massive, and the z bracket included to support the weight extends even further. I can't even fit it 😭

[–] mumei 3 points 1 year ago* (last edited 1 year ago)

Since you already got your answer (separate cables are safer), I'm absolutely loving the fit. Gigantic GPU and coolers inside small cases are the bane of my existence. I'm also about to shove a 7900XT into a Meshify C, plus I'm sporting a Dark Rock Pro 4 haha and I really like the way it looks