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Topic: How many 6970's per 1500W PS - page 2. (Read 2263 times)

full member
Activity: 196
Merit: 100
September 29, 2011, 12:20:37 AM
#6
I'm a little confused..  if you really meant 5970 you might want to edit the topic and OP Wink
full member
Activity: 235
Merit: 100
September 29, 2011, 12:16:45 AM
#5
Buy a kill-a-watt.  Every miner should have one.

I don't think you will get another 5970 though.

A 3x 5970 system draws 945W @ the wall.  Overclocked they draw 1020.

I would guess 4x 5970 are drawing.  ~1100W maybe 1200W overclocked.  Unless you want efficiency to fall off a cliff (waste money, and more heat) you don't want to load powersupply more than 80%.  1500W @ 80% = 1200W.  You likely could squeeze one more in but the PS will be running very hot and inefficient.
ya i'm pulling between 1100 to 1200w
i have a kill-a-watt... clone
just hopefull i guess..

i have a spare 720w powersupply....
but only has 6 pin PCIe connectors.
guess I can hook them up to the 6 Pin connectors on 2 video cards and use the 8 pin connectors from the 1500W PS in the 8 pin connectors...


thanks for the replies
full member
Activity: 196
Merit: 100
September 28, 2011, 11:14:07 PM
#4
I currently have 4 6970 cards to 1500w Strider power supply...
and was wondering if i could add a 5'th one.

I don't think you will get another 5970 though.

I'd wager you're right Tongue
donator
Activity: 1218
Merit: 1079
Gerald Davis
September 28, 2011, 10:59:54 PM
#3
Buy a kill-a-watt.  Every miner should have one.

I don't think you will get another 5970 though.

A 3x 5970 system draws 945W @ the wall.  Overclocked they draw 1020.

I would guess 4x 5970 are drawing.  ~1100W maybe 1200W overclocked.  Unless you want efficiency to fall off a cliff (waste money, and more heat) you don't want to load powersupply more than 80%.  1500W @ 80% = 1200W.  You likely could squeeze one more in but the PS will be running very hot and inefficient.
full member
Activity: 196
Merit: 100
September 28, 2011, 10:46:35 PM
#2
Ah, multi-rail fail.  Appears that PSU has 8 12V rails, each capable of ~300W.  So 1 card per rail (~190W each).

I'd wager you've got 1 rail dedicated to the CPU 4/8pin, 1 to the 24pin ATX, and the other 6 divvied up between peripheral connectors.

As long as you can balance the rails properly, yes.  5 6970s is going to be ~1000W.
full member
Activity: 235
Merit: 100
September 28, 2011, 06:16:11 PM
#1
I currently have 4 6970 cards to 1500w Strider power supply...
and was wondering if i could add a 5'th one.
or will it pull to much power?

MB:P8P67 WS
CPU:i3-2100
and 1 harddrive.

thoughts?
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