Help about CrossFireX and PSU

Toggle sidebar Toggle sidebar
S

serbiandevil

Reputable
Feb 22, 2014
24
0
4,510
My PC specification:

Processor: Intel Core i7-3770K
CPU Cooler: Intel Stock (Will upgrade to H100i soon)
GPU: Asus Radeon R9 270X
Motherboard: MSI Z77A-GD65
Ram memory: Kingston HyperX Beast 2x4GB 2400Mhz
PSU: Chieftec modular A80 750W
Case: Cooler Master 932 HAF Advanced Tower
Reader/Writer: Asus DVD/RW
HDD:Seagate Barracuda 2TB 7200rp

This is picture of my PSU:
http://www.overclockers.ua/power/chieftec-ctg-750c/07-big-chieftec-ctg-750c.jpg

Question:
Can I do 3x CrossFireX with this PSU with 3x Asus R9 270X?

Thanks!
 
Solution
s4in7


Oh not at all, your motherboard is much better than mine and it handles dual 270X's like a champ.

You're all good!
Sort by date Sort by votes
s4in7

s4in7

Honorable
Feb 14, 2014
913
0
11,360
The recommended wattage for 2x Radeon 270X's in Crossfire is 700w, so I'd imagine 3x 270X's would have trouble with 750w.

I run 2x 270X's on a 700w Thermaltake PSU and they run great.

I also noticed that your motherboard's PCIe configuration would be x8 and x8 with two video cards, but x8, x4 and x4 with three video cards.
http://www.anandtech.com/show/6902/msi-z77agd65-gaming-review (for the Gaming variant, but still the same PCIe configuration)

Something to think about, although an x4 PCIe Gen3 slot is the equivalent of an x8 PCIe Gen2 slot which many video cards can't fully saturate so the impact would be minimal.

I'd suggest just going with two 270X's or upgrading your PSU if you really want to run three.
 
Upvote 0 Downvote
s4in7

s4in7

Honorable
Feb 14, 2014
913
0
11,360


Oh not at all, your motherboard is much better than mine and it handles dual 270X's like a champ.

You're all good!
 
Upvote 0 Downvote
Solution
S

serbiandevil

Reputable
Feb 22, 2014
24
0
4,510
Ok but if you can see on picture "http://www.overclockers.ua/power/chieftec-ctg-750c/07-chieftec-ctg-750c.jpg" VGA-1 and VGA-2 are busy on my PSU for my one Asus R9 270X, I see no where to put power cable for my new GPU wich I will buy soon?
 
Upvote 0 Downvote
s4in7

s4in7

Honorable
Feb 14, 2014
913
0
11,360

Your 270X should've come with a couple molex to PCIe 6 pin adapters, as your new one should. That'll give you the connections you need.
 
Upvote 0 Downvote
S

serbiandevil

Reputable
Feb 22, 2014
24
0
4,510
OK, what I'm now using:

-On VGA1 port "http://www.overclockers.ua/power/chieftec-ctg-750c/07-chieftec-ctg-750c.jpg" I'm using cable "http://www.pcpower.com/images/products/b/PCIE-6-8_3853.jpg"
-On VGA2 port "http://www.pcpower.com/images/products/b/PCIE-6-8_3853.jpg" I'm using cable "http://www.pcpower.com/images/products/b/PCIE-6-8_3853.jpg"

From where I got them? From PSU, should I continue do this or replace with molex and should I use 2x cables for my one GPU? Teach me, I'm noobish. :(
 
Upvote 0 Downvote
s4in7

s4in7

Honorable
Feb 14, 2014
913
0
11,360
Wait! I just looked at the picture of your PSU and you're using VGA 1 & 2 with 6 pin adapters to your 270X correct? You're not using any of the four PWR connections? Those are already 6 pin so you can get yourself a couple 6 pin male-to-male cables (some should've come with your PSU) and use PWR 1 & 2 just fine :)

Refer to this diagram I made, and excuse the poor quality:

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

TRENDING THREADS

Latest posts

Moderators online

Share this page

COMPANY
RESOURCES
FOLLOW
Top Bottom