Enclark
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Hey there!
I was lucky enough to get a FTW3 3090 Ultra just the other day and I’m not sure how to go about having 3 power connectors. The two PCI-E power cables I have split into two separate 6+2 connectors at the end of each cable. Will it be okay to leave one connector hanging since I will only need 3 out of the 4? Thanks in advance!
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GGTV-Jon
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Re: FTW3 Ultra 3090 Power Cables
2020/10/24 13:30:57
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You should have already known what was needed and made sure your PSU was good enough - if you have a modular PSU you could see if you can get another cable from the manufacturer.
Leaving one of the 3 connectors off is a nogo - why would you buy a 390 and do that????
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mchang1984
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Re: FTW3 Ultra 3090 Power Cables
2020/10/24 13:54:14
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No, if you see 3 8 Pin Connectors you need to plug in 3 8 Pin Connectors.
You can't leave a 3rd one out and have only 2, that's crazy.
Time to upgrade the Power Supply to like a 1000 Watt PSU that can do 3 8 Pin Power Cables.
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mark6509
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Re: FTW3 Ultra 3090 Power Cables
2020/10/24 13:54:39
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Enclark
Hey there!
I was lucky enough to get a FTW3 3090 Ultra just the other day and I’m not sure how to go about having 3 power connectors. The two PCI-E power cables I have split into two separate 6+2 connectors at the end of each cable. Will it be okay to leave one connector hanging since I will only need 3 out of the 4? Thanks in advance!
This should work fine as long as your PSU is at least 700W
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transdogmifier
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Re: FTW3 Ultra 3090 Power Cables
2020/10/24 13:56:23
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Personally, I wouldn't daisy chain the card.
Update your PSU .....you spent 2k on the card, get a decent PSU for it.
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jingiko
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Re: FTW3 Ultra 3090 Power Cables
2020/10/24 13:58:14
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From my experience you should be okay with leaving one of the 6+2 out in the open given it doesn't make contact with anything else around your case/gpu/motherboard etc.
Ive done this with budget GPUs never anything with a GPU costing $500+ tho.
Although the 3090 is very very power hungry and has the potential to leave you with some issues down the line.
However ideally if your PSU can handle the power requirements of the 3090 each of the three 8pin power connectors on the GPU should have its own dedicated connection (ie. three individual 8pin cables).
This was it would ensure all three connectors are getting consistent even power needed to run the GPU at its designed potential. If your PSU cant handle two split 6+2 while leaving one out you could see performance loss or crashing at the moment it needs the power (heavy intensive rendering scenes/gameplay).
If you list the PSU you have anyone here can easily tell you what you need and confirm if its capable.
Hope this helps!
TL:DR I would recommend using individual 8pin cables to your 3090 where each 8pin cable goes into separate 8pin ports on your PSU. Given your PSU can handle the 3090
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GGTV-Jon
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Re: FTW3 Ultra 3090 Power Cables
2020/10/24 14:05:30
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mark6509
Enclark
Hey there!
I was lucky enough to get a FTW3 3090 Ultra just the other day and I’m not sure how to go about having 3 power connectors. The two PCI-E power cables I have split into two separate 6+2 connectors at the end of each cable. Will it be okay to leave one connector hanging since I will only need 3 out of the 4? Thanks in advance!
This should work fine as long as your PSU is at least 700W
Mark, please never encourage someone to leave out a power connector on a GPU, Esp. on a card like a 3090 FTW3 Ultra - that is just plain bad advise Daisy chaining / using 8 pin splitters has never been a good idea - has been proven even on the 1080 series cards - there was enough crashing under load proven to be a power cable issue. That is why GPU makers no longer provide them
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Hoggle
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Re: FTW3 Ultra 3090 Power Cables
2020/10/24 14:11:50
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Best option is to use three separate cables if possible if you can’t you can use two on the same cable. You would just have two on one cable plugged in and one on the other. Letting the other connector hang free is perfectly fine.
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Hoggle
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Re: FTW3 Ultra 3090 Power Cables
2020/10/24 14:15:08
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GGTV-Jon
You should have already known what was needed and made sure your PSU was good enough - if you have a modular PSU you could see if you can get another cable from the manufacturer.
Leaving one of the 3 connectors off is a nogo - why would you buy a 390 and do that????
I think he means the PSU had two cables for a PCI-e. They commonly have two connectors on each cable from most PSU manufacturer. This means he would have enough connections but would have to leave one plug hanging free.
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GGTV-Jon
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Re: FTW3 Ultra 3090 Power Cables
2020/10/24 14:35:30
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Hoggle
GGTV-Jon
You should have already known what was needed and made sure your PSU was good enough - if you have a modular PSU you could see if you can get another cable from the manufacturer.
Leaving one of the 3 connectors off is a nogo - why would you buy a 390 and do that????
I think he means the PSU had two cables for a PCI-e. They commonly have two connectors on each cable from most PSU manufacturer. This means he would have enough connections but would have to leave one plug hanging free.
Yup my bad - sometimes it is really amazing what the brain will pick up and what it glosses over when reading - the OP didn't edit his post and for whatever reason I totally glossed over this part "Will it be okay to leave one connector hanging since I will only need 3 out of the 4? Thanks in advance!"
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Enclark
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Re: FTW3 Ultra 3090 Power Cables
2020/10/24 14:37:58
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Hoggle
GGTV-Jon
You should have already known what was needed and made sure your PSU was good enough - if you have a modular PSU you could see if you can get another cable from the manufacturer.
Leaving one of the 3 connectors off is a nogo - why would you buy a 390 and do that????
I think he means the PSU had two cables for a PCI-e. They commonly have two connectors on each cable from most PSU manufacturer. This means he would have enough connections but would have to leave one plug hanging free.
This is exactly what I meant, thank you for confirming. I have a 850W fully modular PSU. I don’t plan on doing any overclocking. I would have enough connections as you said, just didn’t know if it was okay to have an extra. I’m getting tore up on this forum haha
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Enclark
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Re: FTW3 Ultra 3090 Power Cables
2020/10/24 14:39:46
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Hoggle
GGTV-Jon
You should have already known what was needed and made sure your PSU was good enough - if you have a modular PSU you could see if you can get another cable from the manufacturer.
Leaving one of the 3 connectors off is a nogo - why would you buy a 390 and do that????
I think he means the PSU had two cables for a PCI-e. They commonly have two connectors on each cable from most PSU manufacturer. This means he would have enough connections but would have to leave one plug hanging free.
This is exactly what I meant, thank you for confirming. I have a 850W fully modular PSU. I don’t plan on doing any overclocking. I would have enough connections as you said, just didn’t know if it was okay to have an extra. I’m getting tore up on this forum haha
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jingiko
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Re: FTW3 Ultra 3090 Power Cables
2020/10/24 19:22:57
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Enclark
Hoggle
GGTV-Jon
You should have already known what was needed and made sure your PSU was good enough - if you have a modular PSU you could see if you can get another cable from the manufacturer.
Leaving one of the 3 connectors off is a nogo - why would you buy a 390 and do that????
I think he means the PSU had two cables for a PCI-e. They commonly have two connectors on each cable from most PSU manufacturer. This means he would have enough connections but would have to leave one plug hanging free.
This is exactly what I meant, thank you for confirming. I have a 850W fully modular PSU. I don’t plan on doing any overclocking. I would have enough connections as you said, just didn’t know if it was okay to have an extra. I’m getting tore up on this forum haha
Could you also give us the brand name of the 850W PSU? We just want to make sure its from a reputable brand that can actually deliver what you've paid for just in case. I know there's a lot of knock off unbranded versions on eBay etc
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justin_43
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Re: FTW3 Ultra 3090 Power Cables
2020/10/24 19:37:58
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Wow.. people didn't even bother to understand the question he was asking just blasted the guy. Good way to alienate people from the forums here.
Anyway to the OP, you should be fine. In a perfect situation you would have each connector on a separate cable, but you will be okay to double up in the last one. It's not a huge deal. Jacob responded in another thread to someone asking the same question and he said it was all good to daisy chain one of the connectors. Have fun with your new card! I'm jealous, can't wait to get one too.
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jankerson
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Re: FTW3 Ultra 3090 Power Cables
2020/10/24 19:43:55
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mchang1984
No, if you see 3 8 Pin Connectors you need to plug in 3 8 Pin Connectors.
You can't leave a 3rd one out and have only 2, that's crazy.
Time to upgrade the Power Supply to like a 1000 Watt PSU that can do 3 8 Pin Power Cables.
MOST good quality 850W PSUs and above have 3 separate PCIe cables.
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Enclark
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Re: FTW3 Ultra 3090 Power Cables
2020/10/24 22:50:25
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Thank you so much! I tried to find a post answering my question but was unsuccessful. I now feel confident about wiring my new card up. I hope you are able to get one soon! @justin_43
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Aurummorituri
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Re: FTW3 Ultra 3090 Power Cables
2020/10/24 23:10:49
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Preferably you would use three cables with only ONE connector on each end and not the ones with two. That counts as daisy-chaining and it not a great idea with a card that can pull 450W.
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TelFiRE
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Re: FTW3 Ultra 3090 Power Cables
2021/04/03 16:38:08
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This thread should be deleted. It's full of absolute misinformation and it's a major result on Google.
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domingo_x
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Re: FTW3 Ultra 3090 Power Cables
2021/04/13 14:21:28
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I'm still curious what the right answer is to his question. I don't think people actually read what he was asking.
With Corsair power supplies, ALL PCIe cables have 2 connectors. They're like a "Y"
Can you connect two of them (with one of the ends of the "Y" tucked away or hanging) or is it necessary to connect three separate cables with 3 of the "Y" connectors unused?
I've been looking around and answer range from "of course 2 cables = enough" to "NO, THE WIRES WILL MELT!" Anyone actually have a legit answer?
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TheDoctorCMG
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Re: FTW3 Ultra 3090 Power Cables
2021/04/13 17:17:43
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domingo_x
I'm still curious what the right answer is to his question. I don't think people actually read what he was asking.
With Corsair power supplies, ALL PCIe cables have 2 connectors. They're like a "Y"
Can you connect two of them (with one of the ends of the "Y" tucked away or hanging) or is it necessary to connect three separate cables with 3 of the "Y" connectors unused?
I've been looking around and answer range from "of course 2 cables = enough" to "NO, THE WIRES WILL MELT!" Anyone actually have a legit answer?
The short answer is this: you want three individual 8 pin connectors coming from three individual ports on your PSU. Having two 8 pin from the psu that splits into two 8 pin connectors is not ideal. One of the cables would likely get over loaded at some point.
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rjbarker
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Re: FTW3 Ultra 3090 Power Cables
2021/04/13 19:50:29
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^^^^ Wow...a lot of misinformed in this thread.....many psu come with a pci-e cable that has 2 * 6+2 pin connectors at one end.It is absolutely fine to use one of the connectors in one of the plugs on the GPU (just not both of them into 2 plugs. Leaving one of the plugs dangling free is not an issues (other than aesthetics).
Hell even my high end Corsair AX1600i has a number of the dual PCI-E cables (but it also has a several single cables).
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TheDoctorCMG
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Re: FTW3 Ultra 3090 Power Cables
2021/04/13 23:00:13
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Do as you wish with your own hardware. The best way to hook these cards up is with three separate 8 pin connectors without even factoring in the potential for load balance issues. Those dual 8 pin connections are rated at 225 watts safely. With the way these cards power balance it could be trying to pull 300 watts from the daisy-chained connector while the dedicated 8 pin is left sucking 25 watts. While the pci-e slot does the rest. That's without even updating to the 450 watt vbios.
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RickJamesBish
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Re: FTW3 Ultra 3090 Power Cables
2021/04/14 03:57:10
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Go for it. There is more data on this forum to support that daisy chaining is not a concern than vise versa. There are posts by EVGA techs stating that if the included cable is a split cable, its fine to use it.
I personally ran my 3090 FTW3 Ultra on a 650 split for a couple weeks, then a 750 split for a couple months, then finally got a 1000 with 3 dedicated. While I did not have trouble with any of them, I did not want to be right on the edge the whole time. You should be fine with an 850 daisy chained.
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domingo_x
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Re: FTW3 Ultra 3090 Power Cables
2021/04/14 10:54:17
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I'm already going through an RMA for a dead 3090 after using 3 separate power cables, hence I'm really curious about this. EVGA doesn't pay for your RMA shipping so I'm in no hurry to go through this again.
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