i am offering help/advice on biulding rigs

[zackclark70]

How much power rig with 3 5970 and 1 6990 will need for LTC and BTC mining?. I am assuming LTC takes more.

As per my reading 5970 takes around 300w and 6990 around 400w at top load.

So this means 1300 w with 200 w for Mobo etc. should a 1600w LEPA would do ?

Also i read, card take around 75w from mobo so does that means its 375 for a single 5970 or this is included in the 300w?

Till now i have found this(http://www.amazon.com/LEPA-1600-Watts-Crossfire-Certified-G1600-MA/dp/B007W5TV6K/ref=sr_1_1?s=electronics&ie=UTF8&qid=1371839485&sr=1-1&keywords=lepa+1600w).

Any other recommendation ?

i have only ever used 7950 and 7970s  for mining

nomaly the total wattage covers what it pulls from the motherboard

i have found if you use a lowpower cpu or  underclok / undervolt   motherboard cpu and ram can be less than 120w

i would say looking at the numbers that psu should be fine ( if your on 110v it would pull upto 16A from the wall )

buy your self a plug in watt meeter to check what wattage you are puling from the wall just to be safe

if you have any questions just ask

zack

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[tom_o]

You can also disable any extra cores on the cpu which can reduce power draw significantly, it's the difference between my rig not booting and being able to run a 7970 at 1085/1500 mining litecoin.

[zackclark70]

You can also disable any extra cores on the cpu which can reduce power draw significantly, it's the difference between my rig not booting and being able to run a 7970 at 1085/1500 mining litecoin.

with my 1090t cpus i have found lowering the multiplyer to x8 and voltage to 1.1v it uses th same as disabaling 5 cores lol