What do I need to have for SLI?

rhysneville

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Here's my current set up :
CPU - Intel i7 2600 @3.40GHz
GPU - EVGA NVIDIA GTX 660 Ti
RAM - 8GB (Speed: PC3-10600 MB/sec,Type: DDR3-1333)
Motherboard - MSI Z77A-G45
PSU - OCZ-ZS650W-UK ATX 650w PSU
HDD - 2TB (Interface: SATA, Rotational Speed: 5400 RPM)
Blu ray disk drive (not sure about specs)
Case- Zalman Z11 Plus


I'm looking to buy another GTX 660 Ti to SLI with my current one.

I posted a question asking about this and someone said ' the 660 Ti requires two 6-pin power connectors. That PSU model only has two 6-pin connectors, which are currently occupied by your current GPU. Perhaps there is a workaround of which I am unaware?'
To which someone else replied with 'ou don't need a new PSU. You unit has a single 46a 12v rail (552w), which is plenty for two 660ti's (they draw ~150w each under full load).

You *will* need a couple of 6 pin pci-e splitters; they'll run about $5.'

Can anyone PLEASE link to me a UK site where I can get these cheap, good quality cables? (I don't really know that much about this)



Also, I don't have an SLI bridge connector, can someone also link me to one of these, I don't know if i need a specific one or not and the only one I found was £40, I hope that's not right?!:(


Sorry for being a pain, but thanks!
If I have missed anything out or if you would like to ask something, go ahead and I'll be sure to get back to you!
 
Solution

sna

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here you go

http://www.ecrater.co.uk/p/17710326/asus-long-flexible-nvidia-video?gps=1

as for the VGA power , I guess they include the adapter with the card , so buy the card nd see if it is included .. if not , order the power plug

 
Solution

rhysneville

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Thank you so much!
I have 2 of these which came with my 660 ti - http://www.playtool.com/pages/psuconnectors/pcie6.jpg
but it's not them I need it's these right? - http://www.amazon.co.uk/Startech-com-Express-Power-Splitter-Cable/dp/B004NNTVT6/ref=pd_sim_computers_4
 

sna

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you don't need the splitter , use the included 4 pin molex adapter , make sure each is connected to a separate cable not shared.

your best choice is to connect the each 6 pin PCIe you have to different cards , and for the other 6 pin on use the adapter included.

 

rhysneville

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When I get down to installing my new GPU, I won't have a clue what to do, I've never set up SLI cards before!:(
Sorry to be a pain, and thanks for bearing with me, but could you go into more detail?
You're talking about the molex adapter I gave a link to right?
What do I connect to the 4 pin and then where do the 2 6 pin wires from the adapter then go to?
 

sna

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Hi again ,

Your OCZ powersupply has the following cables

2 6 Pin PCIE , 4 x 4pin , 8x Sata

what you should do is,

connect one 6pin to the first VGA card , and use the Adapter that comes with the card for the second 6 pin , using 2 of the 4 pins from the power

do this for both cards.

and don't buy the splitter .

see this movie

http://www.youtube.com/watch?v=ieFyHUpqxHM

do the same for both cards :)
 

rhysneville

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Oh right!
I understand now!
But can't i just use 2 6 pins on one card then use the adapters on the other gpu? or would that cause problems?
 

sna

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I never tried both using adapters. and I guess it is better to put at least one native 6 pins power and use adapters for the second.

It should work both ways. but I never tried it.


 

rhysneville

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Yeah I'll just do your first idea anyway, better to share it out I guess, so it's equal!
Thank you so much, made it much more clearer for me!:)
 

rhysneville

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Nope, doesn't give me the option to choose him as the solution but it does let me choose you?
 

rhysneville

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Wait, what do you mean not shared? My current PSU cable has my fans connected to it and they have extension ports on it..
Is that what you were referring to, not shared?
 

sna

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yes. but don't worry most fans draw around 1-2 watts only

try to look at the fans and see the Volt and current and multiply them will give you the WATT.

some fans reach 6 Watts but are rare ones.


it will work but lifting the load off the wires is better , you can connect the fans to sata plugs as well.

 

rhysneville

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Dude, really, thanks so much for your help and for keeping patient with me, I know I'm not the best with components haha!
When I get down to actually putting the 660 ti in, I'll have a proper look then and see if the fans can be used somewhere else.
Thank you!
 

sna

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you are welcome :)

and whatever you do , don't goto the 6pin splitter Idea , u know the splitter means joining the 2 six pins ON THE CARD and making them as one , this is a bad idea , the VGA card makers made them 2x6 pins and not 1x6 pin for a reason ! too much load if you join them .. other wise hey would just made the card with just 1x6 pins power ...
 


Totally false.

Since that OCZ-ZS650W PSU only has a single +12V rail both the 6-pin and (6+2) cables are connected together inside the PSU.

6-pin PCI-E connectors are meant to provide 75 Watts.

(6+2)-pin PCI-E connectors are meant to pride 150 Watts.

On this power supply all of the output cables use 18 AWG wires.

This means that the 6-pin PCI-E connector can also provide 150 Watts just as safely as the (6+2)-pin connector.

Using PCI-E Y-splitters just makes for cleaner cable management.
 

rhysneville

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Nevermind, I think it's working now!:)
 

rhysneville

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Haha just when I thought I had it you guys confused me again!:(
What splitters? You don't mean the 4 pin molex adapter do you?
 


Glad to hear that! :)
 

sna

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sorry ,you need to prove it better. there is no "this means" here especially when the power supply maker themselves make separate cables for each 6 pin plug ... this is not cost effective when a splitter at end would be easier for them to do.

Theoretically what you are saying could be true , but I wont take the chance here of "this means" .

I will stay on the safe side. especially when giving advices to people with no knowledge about it.

and please stop trying to "show off" , we are trying to help here not to get novice people "confused" .


 

sna

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don't worry , your cables will work.

I was talking about the 6pin splitter , not the included with the card 2x4pins to 6 pins plugs.

 

rhysneville

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haha good, sorry man, I must be such a pain!