need help with power supply connector

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bobotheboss

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ok guys I have a problem I'm getting a second 970 for sli but my power supply only has one 6 pin connection left and one 8 pin connection but the graphics card requires two 6pins. Should I get 8pin that divides into two 6 pins or a 6 pin that divides into two 6 pins (I don't know if these exist) so help would be grateful.

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Math Geek

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all the pcie connectors should be 6+2 pins which means that the 8-pins come apart to make 6-pins leaving the extra 2 pins hanging off. they should look like this when apart

pcie6plus2.jpg


the extra 2 pins should slide right out to separate them.
 
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bobotheboss

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ok I might have a solution guys my current 970 is 2 6pins that goes into splitter that creates a 8 pin for (gtx 970 asus) I could take the splitter off and use the 2 6pins for the new 970(gtx evga ftw) and buy and 8 pin to pin for my gtx asus 970 is that a better idea ??

thanks again guys
 
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bobotheboss

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ok I might have a solution guys my current 970 is 2 6pins that goes into splitter that creates a 8 pin for (gtx 970 asus) I could take the splitter off and use the 2 6pins for the new 970(gtx evga ftw) and buy and 8pin to 8pin for my gtx asus 970 is that a better idea ??

thanks again guys
 
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DSzymborski

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Ah, that's not an 80 Plus Platinum, which explains the discrepancy in the cabling. This is the most basic 80 Plus certification, frequently referred to as 80 Plus White. Keep in mind through all of this is that this is a *really* old PSU, probably a decade old, and it's likely in its last stretch.

But I'm still confused by your cabling situation. Your problem isn't not having enough connections -- this PSU is outfitted to have two 6+2 and four 6-pin connections. From what you write, your problem appears to be not having enough *cables* which is a very different problem.

You talk about an 8-pin "for the power supply" but that's not how you determine a cable. Modular power cables are only standardized on the GPU side, there's no industry standard for pinouts on the PSU side, so it's not as simple as going out and finding some generic 8-pin-to-whatever cable and just plugging it in.

This is assuming I'm completely grasping what you're getting at here. Talking about the pins on the PCIE connector as the same as the pins on the power supply makes this all a bit confusing since they're not the same thing.

Your best bet is to go and get cables directly from Silverstone.

http://www.silverstonetek.com/product_access.php?tno=4&area=en

The good news is that Silverstone says that the cables are standardized across all their PSUs, though I still think it's worthwhile to double-check your model with customer support, simply because of its advanced age. Do not just buy any old PCIE cable that physically fits into the PSU because the wrong pinout gives a good chance for Very Bad Things to happen.

Though given the age of the PSU and the effort, time (and a bit of money) involved in replacing the cable, I'd be strongly tempted to just buy a new PSU with four 6+2 pin connectors and call it a day.

PCPartPicker part list / Price breakdown by merchant

Power Supply: SeaSonic - FOCUS Plus Gold 750W 80+ Gold Certified Fully-Modular ATX Power Supply ($86.31 @ Amazon)
Total: $86.31
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-03-11 13:23 EDT-0400

 
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DSzymborski

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If money's an issue, why not just hold off then on a second 970? GPU prices, even used ones, are terrible right now and SLI scaling is getting significantly worse as time goes on, not better. And with the 970s VRAM issue past 3.5 gigabytes, you'll occasionally run into problems there in a multi-GPU situation as well.
 
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Math Geek

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take a picture of the label of the psu as well if possible so we can be sure what you're working with.

sounds like DS is thinking what i am now thinking. that you need the actual modular cable. as he noted, you have to buy those from someone who made them especially for your psu. they are not generic nor standard at all. but that's what it sounds like you need to us at the moment.

a picture of the connections you do have would help us to determine if an adapter is a good idea or not. in about 99% of the cases, they are not a good idea at all. but need a lot more info on what you got to know for sure what your options are.
 
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DSzymborski

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With that good a deal, I might just explore selling both your 970s used and seeing what you can get new or used with *that* money. One strong GPU is almost always preferable to two average GPUs, even if the average GPUs would theoretically combine for more power (you never get anywhere near ideal scaling). If you can sell your 970s for enough to get a used 1070 for a reputable used seller, you'd solve both the PSU problem and the SLI-scaling problem in one fell swoop.
 
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bobotheboss

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yeah i totally agree 1 gpu is better than 2 plus the prices of cards even 970s 2nd hand are going for crazy prices due to bitcoin mining so i could mibs make some good money of them both and go for 1 1070, also 2 cards will probably bottleneck my 3770k OC cpu
 
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DSzymborski

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Just an option to consider of course! If you do stay with the two 970s, just get a cable from Silverstone which will get you set.
 
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bobotheboss

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Math Geek

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that's the right idea. remove the 2 6-pin to 8-pin adapter and use them for the new 970 and then get a cable for the 8-pin you need.

only problem issue is that the cable you linked to says it fit most models made after 2009. the model you have came out in 2008. so not sure if it would work or not. probably would work but i can't say for 100% that it will. i don't see any cables there that say before 2009 on them.
 
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bobotheboss

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at the bottom of the page it has *Supported PSU List my psu is in there so i think it will do the trick
 
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Math Geek

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that's good. sorry i did not make it that far down the page. i stopped right at the top with the 2009 date and then looked up when that psu came out. if they say it's compatible, then i'd trust them. they made the psu and cables after all :)

good luck, hope it works out.
 
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bobotheboss

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aww ok yeah it will work then again thanks again for the reply's both math geek and DSzymborski yous helped a bunch, and yeah i hope all works out well and i hope the sli dosnt bottleneck my OC i7 3770k too much lol :p
 
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