clanwce
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I recently got the RTX 3080 Ti ftw ultra to replace my 3070, and found that it requires 3 8-pin connector. My power supply is the Silverstone SX750, which only has 3 8 pin connectors, one for CPU and the other 2 for GPU.
The PSU layout is here:
I'm wondering if I can use any of the 6 pin on the PSU and buy a converter cable to make it 8 pin,
or if I can use the 8Pin but chained for the 2nd and 3rd connector on the 3080 Ti.
As I just got the power supply a few months back, I would prefer not to change it if possible.
Thank you!
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Sajin
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Re: RTX 3080 Ti ftw3 Ultra PCIE connector issue
2021/10/20 13:40:05
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Get a new psu. Adapters just add another failure point. That psu may not be able to handle the transient spikes the 3080 ti ftw3 will have as well.
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nomoss
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Re: RTX 3080 Ti ftw3 Ultra PCIE connector issue
2021/10/20 13:50:37
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What Sajin said. I would recommend a 1000 watt PSU for that video card. Or at least a good 850.
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kevinc313
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Re: RTX 3080 Ti ftw3 Ultra PCIE connector issue
2021/10/20 14:57:03
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☄ Helpfulby clanwce 2021/10/20 15:12:04
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clanwce
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Re: RTX 3080 Ti ftw3 Ultra PCIE connector issue
2021/10/20 15:16:29
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kevinc313
I'd say you can get it running, daisy chain connectors 1+3, as 2 draws the most power:
I assume you're not running a SFX PSU just for fun. You're probably going to have power shutdowns but won't know until you try. Good luck keeping the card cool in a SFF case.
Thank you so much! You are right. I have NR200 Case and anything larger than SFX won't fit, and it seems good SFX PSUs are capped at 750W. What about using 6pin adapters for the 3rd 8pin? I currently have 2 spare 6pin ports on the PSU and I saw there are adapters to combine 2 6 pins into 1 8 pin. I can either just get a 6 to 8 or 6x2 to 8. Do you think that's better than daisy chaining 1+3?
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kevinc313
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Re: RTX 3080 Ti ftw3 Ultra PCIE connector issue
2021/10/20 16:00:31
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☼ Best Answerby clanwce 2021/10/21 00:50:40
clanwce
kevinc313
I'd say you can get it running, daisy chain connectors 1+3, as 2 draws the most power:
I assume you're not running a SFX PSU just for fun. You're probably going to have power shutdowns but won't know until you try. Good luck keeping the card cool in a SFF case.
Thank you so much!
You are right. I have NR200 Case and anything larger than SFX won't fit, and it seems good SFX PSUs are capped at 750W.
What about using 6pin adapters for the 3rd 8pin? I currently have 2 spare 6pin ports on the PSU and I saw there are adapters to combine 2 6 pins into 1 8 pin. I can either just get a 6 to 8 or 6x2 to 8. Do you think that's better than daisy chaining 1+3?
Yeah like this one? https://www.amazon.com/Express-Adapter-Graphics-20-inches-TeamProfitcom/dp/B07D8QBN79/ Nope. That's a 6-pin PCIe power cable, your PSU has 6-pin PERF/SATA/AUX connectors which also carry 5V and 3.3V. Thankfully it should not plug in. They do make molex or CPU or sata to PCIe 8-pin adapters, though they are generally considered sketchy and should only be used by advanced builders who are 100% sure they know what they are doing. I'm not aware of anyone making a direct 6-pin PERF to 8-pin PCIe cable, probably because it would only be good for about 100w, due to the single contact carrying 12V at the PSU. See this generic diagram, WHICH MAY NOT BE EXACTLY WHAT YOUR PSU IS:  Of course, if you had the right skills, there is nothing stopping someone from making a cable you describe to tap the 12V off the 6-pin perfs and run them to a 8-pin PCIe. Do not attempt. The provided daisy chain will be fine, maybe, but not due to a limit of the cable, which should be good for 288W at the PSU plug. 1+3 on the card should only pull at most 225W at the max power limit of the bios. Make sure you're not pumping a ton of hot air at the PSU where the cables plug in.
post edited by kevinc313 - 2021/10/20 16:13:23
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Sajin
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Re: RTX 3080 Ti ftw3 Ultra PCIE connector issue
2021/10/20 17:03:16
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I think the op is confused. The psu does not only have a total of 3 8-pins. The psu comes with the proper cables to power the card, but you need to use one pci-e cable to power two 8-pin inputs on the gpu which isn’t ideal for 3000 series gpu’s which require 3 8-pin inputs.
Looks like your psu includes two pci-e cables which provide two 6+2’s per cable for a total of four 6+2’s aka four 8-pins, so you don’t need to buy any adapters. You’ll just use one pci-e cable to power one 8-pin input on the gpu while leaving the other 6+2 not connected, and the other pci-e cable to power the other two 8-pin inputs on the gpu. Not ideal, but it should get the card working, but you may get shutdowns due to transient spikes.
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clanwce
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Re: RTX 3080 Ti ftw3 Ultra PCIE connector issue
2021/10/20 17:40:27
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Sajin
I think the op is confused. The psu does not only have a total of 3 8-pins. The psu comes with the proper cables to power the card, but you need to use one pci-e cable to power two 8-pin inputs on the gpu which isn’t ideal for 3000 series gpu’s which require 3 8-pin inputs.
Looks like your psu includes two pci-e cables which provide two 6+2’s per cable for a total of four 6+2’s aka four 8-pins, so you don’t need to buy any adapters. You’ll just use one pci-e cable to power one 8-pin input on the gpu while leaving the other 6+2 not connected, and the other pci-e cable to power the other two 8-pin inputs on the gpu. Not ideal, but it should get the card working, but you may get shutdowns due to transient spikes.
Thank you!
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clanwce
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Re: RTX 3080 Ti ftw3 Ultra PCIE connector issue
2021/10/20 17:44:48
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kevinc313
clanwce
kevinc313
I'd say you can get it running, daisy chain connectors 1+3, as 2 draws the most power:
I assume you're not running a SFX PSU just for fun. You're probably going to have power shutdowns but won't know until you try. Good luck keeping the card cool in a SFF case.
Thank you so much!
You are right. I have NR200 Case and anything larger than SFX won't fit, and it seems good SFX PSUs are capped at 750W.
What about using 6pin adapters for the 3rd 8pin? I currently have 2 spare 6pin ports on the PSU and I saw there are adapters to combine 2 6 pins into 1 8 pin. I can either just get a 6 to 8 or 6x2 to 8. Do you think that's better than daisy chaining 1+3?
Yeah like this one?
Nope. That's a 6-pin PCIe power cable, your PSU has 6-pin PERF/SATA/AUX connectors which also carry 5V and 3.3V. Thankfully it should not plug in. They do make molex or CPU or sata to PCIe 8-pin adapters, though they are generally considered sketchy and should only be used by advanced builders who are 100% sure they know what they are doing. I'm not aware of anyone making a direct 6-pin PERF to 8-pin PCIe cable, probably because it would only be good for about 100w, due to the single contact carrying 12V at the PSU. See this generic diagram, WHICH MAY NOT BE EXACTLY WHAT YOUR PSU IS:
Of course, if you had the right skills, there is nothing stopping someone from making a cable you describe to tap the 12V off the 6-pin perfs and run them to a 8-pin PCIe. Do not attempt.
The provided daisy chain will be fine, maybe, but not due to a limit of the cable, which should be good for 288W at the PSU plug. 1+3 on the card should only pull at most 225W at the max power limit of the bios. Make sure you're not pumping a ton of hot air at the PSU where the cables plug in.
Yeah I checked the manual for the SATA 6pins and it will draw maximum 60W power, not Ideal, but I also checked that for each 8-pin, it will only supply 150W max power. I'll try connecting 1+3 to one of them and see how it works with the games I play. Btw, do you have any reference on "2 draws the most power"? I was wondering what the reason behind it and I couldn't find any reference to this.
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kevinc313
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Re: RTX 3080 Ti ftw3 Ultra PCIE connector issue
2021/10/20 18:19:44
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☄ Helpfulby clanwce 2021/10/21 00:50:27
clanwce
Yeah I checked the manual for the SATA 6pins and it will draw maximum 60W power, not Ideal, but I also checked that for each 8-pin, it will only supply 150W max power. I'll try connecting 1+3 to one of them and see how it works with the games I play. Btw, do you have any reference on "2 draws the most power"? I was wondering what the reason behind it and I couldn't find any reference to this.
Yeah 150w is the nominal rated limit of a 8-pin PCIe on a GPU. 288w is the commonly accepted estimated limit of a cable and 8-pin at a PSU connection, based on the datasheet rated limits of a genuine Molex brand PCIe standard contact. 300w nominal. #2 plug (middle) commonly pulls the most power. #1 plug (front of PC) pulls about 70-95% of #2 at any given time. #3 plug (rear of PC) pulls 25-50% of #2 at any given time. Based on mine and many other people's software (GPU-Z and HWiNFO) readings of various EVGA 3080 Ti FTW3's, and current/power meter testing. Be aware the software reads about 10% lower than actual. In normal gaming use, you're not likely to exceed 200w on 1+3, and the card will be really hot in that case, you'll probably end up at a 70-90% power limit just because of the temps. Of course, you are strongly advised to test this for yourself with the software and monitor any cables / connectors for overheating.
post edited by kevinc313 - 2021/10/20 18:32:01
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brandonb21
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Re: RTX 3080 Ti ftw3 Ultra PCIE connector issue
2021/10/21 09:17:48
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i have a friend who used a EVGA GM 850 SFX power supply and it worked for there 3080 ti ftw 3!
they used one 8pin without the pig tale for the middle connector of the gpu
than used the two 8pins that are pigtailed for the two outer connectors for the gpu
the power supply has zero issues or crashing and EVGA support told them to do it that way!
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al2jzge
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Re: RTX 3080 Ti ftw3 Ultra PCIE connector issue
2021/11/29 18:47:56
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Can EVGA Support please confirm the configuration in the above comment from @brandonb21?
I am in the exact same situation with a 850 GM SFX PSU and a 3080 Ti FTW3.
And will this configuration put my GPU in any power limitations?
Gaming: Corsair 760T, EVGA Z97 Classified, Intel i7-4790K, CM Seidon 240M AIO, 2x EVGA GTX 970 SSC (SLI), EVGA GTX 960 SC (PhysX), G.Skill TridentX DDR3 2400Mhz 8GB x4, Samsung 850 EVO 250GB, OCZ ARC100 SSD 250GB x2, WD Black 2TB x2, CM SPH-1050W, Dell S2716DG 27inch 1440p 144Hz G-Sync VR/Home Theater: TMT Core v21, Asus ROG STRIX Z270G, Intel i7-7700K, Corsair H115i CPU AIO, EVGA 1080 Ti FE Hybrid, Corsair Dominator DDR4 3200Mhz 8GB x2, Samsung 960 EVO M.2 250GB, WD Blue SSD 1TB, WD Black 6TB, EVGA SuperNova 850 G2, Noctua Fans, Sony XBR65X850C 65inch 4K, HTC Vive
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brandonb21
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Re: RTX 3080 Ti ftw3 Ultra PCIE connector issue
2021/11/30 05:02:07
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al2jzge
Can EVGA Support please confirm the configuration in the above comment from @brandonb21?
I am in the exact same situation with a 850 GM SFX PSU and a 3080 Ti FTW3.
And will this configuration put my GPU in any power limitations?
I can confirm it works just fine, I just finished a build in the Lian LI 0-11 Mini! I have a 12900k and 3080 TI FTW 3 with EVGA GM 850 using my method above I have zero issues. No crashing no blue screening or anything works perfect! One thing you should know is that the PSU will coil wine, people have complained on reddit the EVGA SFX power supply's have a coil wine issue underload, coil wine wont hurt your components but can be annoying depending on how sensitive you are too it. Also the cables are super short, they wouldn't reach to the front of the Mini, I had to buy Cable Mod cables! You will be fine, Enjoy your build! sources: https://www.reddit.com/r/TEAMEVGA/comments/pun2zu/evga_850w_sfx_psu_coil_whine_is_this_normal/my build:  
post edited by brandonb21 - 2021/11/30 05:12:21
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