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Help with powering my new Sapphire HD 7970

Last response: in Graphics & Displays
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November 25, 2013 3:44:06 PM

Hi

I just bought a new Sapphire HD 7970, and it requires two 8-pin connectors from my power supply.
Having looked at various threads and videos, it seems that this graphics card used to come with an 8pin and a 6pin socket, and its still ok to use a 6pin in the second one.

Coming from my PSU (still unused) is one 6pin, which I can put strait into the GPU.

So I need an 8pin connector - the GPU came with two 8pin to Molex connectors (like this). I dont have any free Molex's coming direct from my PSU, but there are two that go through both the fans and my HDD - can I use these, or do they have to be direct from the PSU?

Or is it somehow possible to convert my 1 6pin into two 8 pins?
Or can you add more molex's/6/8pins from the PSU?

Or will I have to buy a new PSU?

Thanks for any help,

Cai

More about : powering sapphire 7970

a b ) Power supply
November 25, 2013 4:46:45 PM

B***U***Y*** NEW PSU. Simple, done.
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a b ) Power supply
November 25, 2013 4:52:28 PM

First, you cannot use the Molex connectors coming from the fans, as they would not supply enough power (they are already powering the fans and HDD).
Second, what PSU do you have? Does it provide 400W? (the 7970 requires a PSU with minimum 400W). Depending on your budget and timeframe of when you plan on purchasing a new computer I would recommend a new PSU that comes with the pcie power plugs you require (safest bet). Here's one for example : http://www.newegg.ca/Product/Product.aspx?Item=N82E1681...
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November 26, 2013 3:01:48 AM

Dom_79 said:
First, you cannot use the Molex connectors coming from the fans, as they would not supply enough power (they are already powering the fans and HDD).
Second, what PSU do you have? Does it provide 400W? (the 7970 requires a PSU with minimum 400W). Depending on your budget and timeframe of when you plan on purchasing a new computer I would recommend a new PSU that comes with the pcie power plugs you require (safest bet). Here's one for example : http://www.newegg.ca/Product/Product.aspx?Item=N82E1681...


Thanks for your reply, I am not sure on the make of my current PSU, but it supplies 650w, so thats ok. I am not too sure what im doing with the inside of computers, so I would rather not have to completely wire up a new power supply - is there no way of getting it working with my current one?
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a b ) Power supply
November 26, 2013 9:10:56 AM

I would have to say that since your PSU has a rating of 650W but only came with one pcie power plug it must be kind of old. PSUs don't last forever and one of the things they are known for as they get older is supplying less and less power. Installing a new PSU is not as difficult as you might think. Check a couple how-to vids on youtube and see what I mean (The 20-24pin motherboard plug, 4 pin [additional cpu power or whatnot depending on the board], your case fans, drives-cd/dvd-hdd(s), and your new GPU via pcie plugs). If you plan on keeping the system for another couple years (at least) and really want to use this particular GPU I would recommend a new PSU (which you can transfer to your next computer when you get it :)  )
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November 26, 2013 9:18:14 AM

Dom_79 is correct. However, it depends on the fans you would be leeching power from if you wanted to go the cheap (wrong) way. I have a build in my living room running the same card under a 450w PSU using adapters that leech off the same line as 3 140mm fans and 2 7200rpm HDD's, get the same results from the GPU as anyone else.
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December 2, 2013 7:08:23 AM

Dom_79 said:
I would have to say that since your PSU has a rating of 650W but only came with one pcie power plug it must be kind of old. PSUs don't last forever and one of the things they are known for as they get older is supplying less and less power. Installing a new PSU is not as difficult as you might think. Check a couple how-to vids on youtube and see what I mean (The 20-24pin motherboard plug, 4 pin [additional cpu power or whatnot depending on the board], your case fans, drives-cd/dvd-hdd(s), and your new GPU via pcie plugs). If you plan on keeping the system for another couple years (at least) and really want to use this particular GPU I would recommend a new PSU (which you can transfer to your next computer when you get it :)  )


Ok, well I guess I will need to buy a new one then. I had a look at the one you linked in your ealier post, but I dont think that it has enough PCI-E connectors. The 7970 needs two 8 Pins, plus whatever else the motherboard needs. Any idea on the kind of price for a PSU that has enough of them?
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a b ) Power supply
December 2, 2013 9:26:24 PM

No it doesn't have the right connectors (2x 6+2) that's my bad. I use this: http://www.newegg.ca/Product/Product.aspx?Item=N82E1681... It is the low end of what Corsair offers, CX is the "builder" series (good performance and price for making several computers and still turning a profit ;)  )
Here's something similar from Sea Sonic in the Gold certified series with the 2x 8/6 pin connectors that card needs : http://www.newegg.ca/Product/Product.aspx?Item=N82E1681...
And here's the same one ^ only modular, which keeps things from getting cluttered inside your case : http://www.newegg.ca/Product/Product.aspx?Item=N82E1681...
And here's the Corsair "version" of that one ^ : http://www.newegg.ca/Product/Product.aspx?Item=N82E1681...
All of them are quality PSUs from two of the most reliable and best rated manufacturers. The higher the price the better the features (like warranty and modular cable system).
None are on sale right now but if you're patient they (and others in those two brands) go on significant sale quite often.
Hope that helps!
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December 3, 2013 10:56:45 AM

Dom_79 said:
No it doesn't have the right connectors (2x 6+2) that's my bad. I use this: http://www.newegg.ca/Product/Product.aspx?Item=N82E1681... It is the low end of what Corsair offers, CX is the "builder" series (good performance and price for making several computers and still turning a profit ;)  )
Here's something similar from Sea Sonic in the Gold certified series with the 2x 8/6 pin connectors that card needs : http://www.newegg.ca/Product/Product.aspx?Item=N82E1681...
And here's the same one ^ only modular, which keeps things from getting cluttered inside your case : http://www.newegg.ca/Product/Product.aspx?Item=N82E1681...
And here's the Corsair "version" of that one ^ : http://www.newegg.ca/Product/Product.aspx?Item=N82E1681...
All of them are quality PSUs from two of the most reliable and best rated manufacturers. The higher the price the better the features (like warranty and modular cable system).
None are on sale right now but if you're patient they (and others in those two brands) go on significant sale quite often.
Hope that helps!


Thanks Dom, lots of PSU choices there. But just one more thing - I looked at the specifications of my mobo (78LMT USB-3), and im pretty sure it said it needed a 20+4 pin and an 8 pin, so would I not need a PSU with three 8 pins (6+2pin)?
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a b ) Power supply
December 4, 2013 6:55:17 PM

No you wouldn't, here's why. The 20+4 is one plug (with the extra +4 option that some boards don't need). The 8pin is from another 4 pin connector that has two different plug orientations (again some boards use 4, the plug is actually 4+4). You're good to go with those PSU's.
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