PSU for GTX 770 or 780

Kasia

Reputable
Mar 1, 2014
7
0
4,510
Hi,

I am an amateur building my own computer and after a long research I am stuck on what PSU I should buy. I am looking to install one of the above graphics cards on my Asrock Z77 Extreme motherboard and I wonder whether I should go for the dual or single rail design for starters and which PSU would provide me with the required 42A as specified here http://forum-en.msi.com/faq/article/printer/power-requirements-for-graphics-cards
?
I am not planning to overclock nor run two cards at once but perhaps upgrade the card in the future for Nvidia Quadro..

I will be doing After Effects and some heavy video rendering..

I am going to run it on i7 3770K (with a standard fan), have one SSD, two HHDs, 32GB RAM and an optical drive

I am based in UK and so far I know the frequency I need (50Hz), the AC Input (240A), that I would probably need 4 SATA connectors (1 extra in case) and the Wattage should probably be 750 (correct me if I'm wrong)

not sure how many PCIe connectors I need? two for the graphics card (6pin and 8 pin) and one for CPU (4 pin)?
Is there anything else I should look out for?
The 42A requirement is something I can’t read from the labels on most PSUs...
I would appreciate some help and any recommendations would be ideal..

Greetings!
 

Kasia

Reputable
Mar 1, 2014
7
0
4,510
Thanks guys! It's a she by the way:) Would you recommend the multiple or single rail design? If I were to draw say 20A from the single rail wouldn't it put too much strain on it as opposed to having a split rail?
 
Don't worry, there is no issue with strain. Some of Corsair's high end PSU's even have a single rail of 100 A.
To find out current requirements for a card, just divide its TDP by 12.
Eg. the GTX680 is a 182 W card, so it requires 15.16 A for itself.
You'll need to calculate for all cards in your system and the CPU and keep 5-8 A for other components such as fans.
Then you get current you require on the +12V rail.