Even without downclocking memory a 1200W is enough to power 3x 6990s, though it is pushing the envelope a little bit. 6990s use ~375Watts per card (300 from 2x 8pin and 75 from PCI-E slot). That's 1125Watts max to be within ATX specifications. In reality they pull less but anyway I digress.
To power 3 6990s you will have to get an 8-pin adapter cable. 8Pin PCIE cables supply 150Watts, 6Pin 75, so do not simply try to plug a 6 pin into the 8pin socket. There are 2 extra ground cables iirc in the 8pin.
Topic: 6990 rig setup help (b) (Read 1360 times)
Actually it should. Going through some other posts it looks like people get the cards down quite a lot pwoer wise by selectively tuning the frequencies.
Moving memory to 300mhz seems to be recommended with people saying cards run around 65 degree centigradem, and IIRC i read somewhere someone said fans at 30%
- this indicates the card may run hot on a point (the processors) but memory and shader units are not busy at all... which makes sense
Moving memory to 300mhz seems to be recommended with people saying cards run around 65 degree centigradem, and IIRC i read somewhere someone said fans at 30%
- this indicates the card may run hot on a point (the processors) but memory and shader units are not busy at all... which makes sense
Well I am learning a lot. Feels like I'm 14 again 
I also have my doubts if the power supply will supply a 3rd card now, but we'll test and see, maybe have them all under-perform until we can source more juice.
Great fun this mining business!
I also have my doubts if the power supply will supply a 3rd card now, but we'll test and see, maybe have them all under-perform until we can source more juice.
Great fun this mining business!
This thing emits enough power to run support hardware and 3x6990s (Club 3Ds).
I dare to disagree with you on that.
Or, at least I have some serious doubts.
He does what I do.... try to mimic the 3x6990 setup from https://en.bitcoin.it/wiki/Mining_rig#Three_ATI_6990s,_Approximately_2.1_Ghash/s
It says 1200w
And 3x6990 Have you got yours running yet or still ordering?
Currently getting quotes and asking wild here - if I get the stuff sorted out, I would order next week, put it in poduction after the following weekend (because I bet some parts do not arrive till end of the week). Would be 1 of x
This thing emits enough power to run support hardware and 3x6990s (Club 3Ds).
I dare to disagree with you on that.
Or, at least I have some serious doubts.
He does what I do.... try to mimic the 3x6990 setup from https://en.bitcoin.it/wiki/Mining_rig#Three_ATI_6990s,_Approximately_2.1_Ghash/s
It says 1200w
And 3x6990 Have you got yours running yet or still ordering?
This thing emits enough power to run support hardware and 3x6990s (Club 3Ds).
I dare to disagree with you on that.
Or, at least I have some serious doubts.
He does what I do.... try to mimic the 3x6990 setup from https://en.bitcoin.it/wiki/Mining_rig#Three_ATI_6990s,_Approximately_2.1_Ghash/s
It says 1200w
And 3x6990 
Use a molex to 8 pin adapter or a 8 pin to 6 pin converter and a molex to 8 pin..
This thing emits enough power to run support hardware and 3x6990s (Club 3Ds).
I dare to disagree with you on that.
Or, at least I have some serious doubts.
I have a 1200W CoolerMaster gold. This thing emits enough power to run support hardware and 3x6990s (Club 3Ds). Problem is the cables do not match with the graphics hardware PCI-e connectors. The PSU has 4xPCI-e 6+2 connectors and 2xPCI-e 6 connectors. The cards have 2xPCI-e 6+2 connectors each. So now I can power 2 cards, but not the 3rd one...
Does anyone know whether the cards can run on one PCI-e 6+2 connector and one PCI-e 6 connector like normal cards seem to?
Does anyone know whether the cards can run on one PCI-e 6+2 connector and one PCI-e 6 connector like normal cards seem to?
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