Enough wattage/amps for 7970 2x crossfire?

Toggle sidebar Toggle sidebar
muellerdillon

muellerdillon

Honorable
Dec 27, 2013
28
0
10,540
Im fairly new to building systems and i keep reading mixed answers online about the wattage required to run 7970 xfire, i want to do this bc it is faster than 780 ti and can potentially cost me up to 200 less and future proof for ultra hd gaming.

System Specs are as follows:
CPU: i5 4670k maybe up to a 4.0ghz OC but not much more, these things run hot
MOBO: Asus Maximus VI Hero
CPU Cooler: Corsair H80i
Case FAns: 2x Cooler master trickleflow red led, one OEM corsair 120mm, one OEM corsair 140mm
RAM: 2x4gb(8gb) g. skill ripjaws x red
SSD: OCZ Vertex 4 128gb
HDD: 1tb toshiba
PSU in question:
EVGA SuperNOVA 750W 80+ Gold Certified Fully-Modular ATX Power Supply

I really like the PSU bc it follows my red and black theme with the red sleeved cables and it has a 10 year warranty as well as high reviews and 80+ gold

I keep reading that 750w is good enough for 7970 crossfire but im unsure, sorry for long description, I'm just hoping to get a very good answer, and if it isnt enough detail please say so

 
Solution
V
Core i5 4670K = 100W (TDP is 84W at stock, but you want to overclock)
Two 7970 cards = 500W
Other components = 50W
Total = 650W
You want to run the power supply at about 70% of its rated power at full load
650 / 0.7 = 928W
I think this is way too much to ask from a 750W power supply.
I suggest at least a 900W supply.

With any single GPU card you can get away with a 600W supply.

As for the xfire solution in general, frame pacing is not good on AMD crossfire.
If you want to go faster than a Nvidia GTX 780 Ti or AMD R9 290X, consider two Nvidia GTX 770 4Gb cards in SLI.

Sort by date Sort by votes
V

VincentP

Splendid
Oct 18, 2013
4,105
1
26,965
Core i5 4670K = 100W (TDP is 84W at stock, but you want to overclock)
Two 7970 cards = 500W
Other components = 50W
Total = 650W
You want to run the power supply at about 70% of its rated power at full load
650 / 0.7 = 928W
I think this is way too much to ask from a 750W power supply.
I suggest at least a 900W supply.

With any single GPU card you can get away with a 600W supply.

As for the xfire solution in general, frame pacing is not good on AMD crossfire.
If you want to go faster than a Nvidia GTX 780 Ti or AMD R9 290X, consider two Nvidia GTX 770 4Gb cards in SLI.

 
Upvote 0 Downvote
Solution
You must log in or register to reply here.

TRENDING THREADS

Latest posts

Moderators online

Share this page

COMPANY
RESOURCES
FOLLOW
Top Bottom