EVGA Gtx 770 - Question on 6-pin and 8-pin PCI-e connectors

aeroman · Mar 18, 2014

Hi !

I have a question about powering my GTX 770 card which has:

1. 6 pin connector
2. 8 pin connector.

I checked my 650 watt PSU, its some unknown brand and lists 19 amp on both 12 volt rails.

My question is :

Will i be able to run this thing on this PSU - EVGA recommends 42A in total on 12 v rails .

I also figured out that my PSU has only 1 PCI-e 6 pin connector whereas got numerous molex pin connectors.

How can i connect the 8 pin connector when there's only one 6 pin connector even i use the adapter.

The packaging has 2 adapters for 6 and 8 pin connector.

I would really appreciate if someone can help me with nearly same hardware setup .

Thanks!

Ahmadjon · Mar 18, 2014

How many amps your PSU has on combined 12v rail? total 19amps or 12v1 19 and 12v2 19?

aeroman · Mar 18, 2014

Thanks for quick update.

Each rail has 19 V , so i guess that would make 38v in total

STACKS ON DECK · Mar 18, 2014

it is a bit close call . . . gtx770 requires 230watts so it means 20amps . so you have to plug some molex also for connections to GPU which provides some more amps for your GPU

Ahmadjon · Mar 18, 2014

You have to use these adapters to supply you GTX-770!
http://www.ebay.com/itm/Molex-IDE-to-PCI-E-8-pin-VGA-Card-Power-Cable-Adapter-/290497779139
http://www.ebay.com/itm/New-6-Pin-PCI-Express-Power-Adapter-Cable-Dual-Molex-4-Pin-to-PCIe-6-Pin-/191105471817?pt=US_Power_Cables_Connectors&hash=item2c7ec61549
Could you give us link about your PSU

aeroman · Mar 18, 2014

I have both of those adapter connectors in the EVGA GTX 770 box.

The PSU has one 6 pin connector which can be connected to the card.

But i dont know what to do with the 8 pin connector.

I have the 8 pin adapter but it has split into two 6 pin connector.

So this is where i am stuck.

aeroman · Mar 18, 2014

I will break this down so it is not confusing.

PSU has - only one 6 pin connector and plenty of molex connectors.

EVGA GTX 770 - requires input of one 6 pin connector and one 8 pin connector.

Included in EVGA box(connector adapter) -

1. 6 pin connector adapter split into two molex connectors.

2. 8 pin connector adapter split into two 6 pin connectors.

Hope this now helps to understand the problem.

Ahmadjon · Mar 18, 2014

aeroman :

I know EVGA's package so use your one PSU's PCI-E 6pin connector and buy this one http://www.ebay.com/itm/Molex-IDE-to-PCI-E-8-pin-VGA-Card-Power-Cable-Adapter-/290497779139
I know that one of these adapters converts two 6pin PCI-E to one 8pin PCI-E cable!

aeroman · Mar 18, 2014

I have read a lot about not using the adapter in the ebay link you have provided coz it is not the right thing to do but although works for many people.

aeroman · Mar 18, 2014

Will this Thermaltake PSU work. I can borrow this from my mate;

http://www.thermaltake.com/products-model.aspx?id=C_00001776

Ahmadjon · Mar 18, 2014

aeroman :

Yes it will work!

aeroman · Mar 18, 2014

Ok i got the answer, the guys at EVGA say it won't work.

They insist that as written on the manual(wall) the card requires 42 amp on a single +12V rail.

So i have got no option than to buy a $100+ high grade power supply probably a Corsair or NZXT gold series.

Thanks for all your support !

Ahmadjon · Mar 19, 2014

aeroman :

Why 100+$? here is good PSU for GTX-770!

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: XFX 650W 80+ Bronze Certified ATX Power Supply ($64.99 @ NCIX US)
Total: $64.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-19 06:13 EDT-0400)

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EVGA Gtx 770 - Question on 6-pin and 8-pin PCI-e connectors

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