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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 633

post #6321 of 38701
I am going to be buying a 7950 to go with my 7970.

Does anyone know what leads I need for my PSU, 2x 6pin to 2x molex or 2x 6pin to 1x molex ? (my PSU doesn't have extra 6pin leads)

Rep for answers thumb.gif
post #6322 of 38701

The video card shipped with the 2x 6pin to 2x molex adapter. It's recommended a 750W PSU with 7900 crossfire.

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post #6323 of 38701
I'd say if you really need to, then get 4x {2x molex to 1x PCIe 6pin}, that way you're maximising the potential power going to the card. You don't want to run short.

4pin molex provides 60W. One 6pin PCIe draws 75W. The card can get 75W thru the PCIe slot itself. To cover the TDP of the card, one single molex to each PCIe power slot would give 60+60+75 = 195W, but I'd get the double connectors just to be sure. (these allow the PCIe power sockets to draw the specification of 75W, IF they need to)
post #6324 of 38701
Quote:
Originally Posted by omega17 View Post

I'd say if you really need to, then get 4x {2x molex to 1x PCIe 6pin}, that way you're maximising the potential power going to the card. You don't want to run short.
4pin molex provides 60W. One 6pin PCIe draws 75W. The card can get 75W thru the PCIe slot itself. To cover the TDP of the card, one single molex to each PCIe power slot would give 60+60+75 = 195W, but I'd get the double connectors just to be sure. (these allow the PCIe power sockets to draw the specification of 75W, IF they need to)

Something like this?

http://www.amazon.co.uk/Neewer-PCI-E-Splitter-Power-Adapter/dp/B005J8DGTU/ref=sr_1_4?ie=UTF8&qid=1331751727&sr=8-4

And why would I need four of them? my 7970 is already connected through 6pin +6+8pin from my PSU.

@Ken I'm fairly sure if I run the cards at stock and don't programs like furmark I should be ok. If not then I can always undervolt.

Plus, I wanted to ask you something, I heard you saying that the 7970 and 7950 can run at their own speeds. Would I encounter any problems with this while playing games at all?
post #6325 of 38701
doh.gif

You'd need two, not four. Sorry. Bad maths. I had it in my head that you need 4 spare molexs off your PSU.

My 7970 came with them, so you might want to check if you've already got one, and another one might come with your 7950. But those are the correct ones you linked to, yes.

Crossfiring different cards from the same gen (i.e 7970 & 7950) works perfectly. I did it with both the 6xxx and 5xxx series, mixing and matching, and it was fine.
post #6326 of 38701

 

Quote:

@Ken I'm fairly sure if I run the cards at stock and don't programs like furmark I should be ok. If not then I can always undervolt.

Plus, I wanted to ask you something, I heard you saying that the 7970 and 7950 can run at their own speeds. Would I encounter any problems with this while playing games at all?

 

That will be fine if you don't push the PSU to 100% of its rated capacity 52A=624W. A single 7970 + PowerTune 20% can easily hit 300W. So the idea is never push the PSU more than 80% for safety and life span. I am sure someone will jump in "I never had a single issue with SLI 580 heavily overclocked".

 

You won't have any problems with 7970+7950 in any applications. Just make sure your mainboard supports at least 2x PCIe @x8/x8 or x16/x8. @x16/x4 is a big NO.

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post #6327 of 38701
Quote:
Originally Posted by Ken1649 View Post



That will be fine if you don't push the PSU to 100% of its rated capacity 52A=624W. A single 7970 + PowerTune 20% can easily hit 300W. So the idea is never push the PSU more than 80% for safety and life span. I am sure someone will jump in "I never had a single issue with SLI 580 heavily overclocked".

You won't have any problems with 7970+7950 in any applications. Just make sure your mainboard supports at least 2x PCIe @x8/x8 or x16/x8. @x16/x4 is a big NO.

I will be sure not to push the 7970 to 20% powertune smile.gif Also, I will probably upgrade my PSU 2-3 months later anyway.

I do have a x8/x8 motherboard biggrin.gif

Thanks for the information wink.gif

Another rep +
post #6328 of 38701
Hey guys, I'm gonna sell my 6950's and get a 79xx series.

Which one should I get? I have my eye on the Sapphire 7950 OC for $470 at Tigerdirect. Are they a decent company to buy from? Do you know of any 7970's that are worth getting over the 7950? (Emphasis on noise, temps, and overclockability.).
Edited by stevman17 - 3/14/12 at 1:10pm
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post #6329 of 38701
Quote:
Originally Posted by stevman17 View Post

Hey guys, I'm gonna sell my 6950's and get either a 79xx series.
Which one should I get? I have my eye on the Sapphire 7950 OC for $470 at Tigerdirect. Are they a decent company to buy from? Do you know of any 7970's that are worth getting over the 7950? (Emphasis on noise and temperatures).

Where are you located?
post #6330 of 38701
Quote:
Originally Posted by vonalka View Post

Where are you located?

New Jersey, US.
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