Need help with putting cards on MOBO

[Legend21]

Dear people.

Need help and advice for making this a stable rig.
First i want to tell my setup

ASROCK fm2a85x
4GB DDR RAM (is this enough)
60 GB SSD
1000W OCV
A4 processor

2x AMD 7990 6GB
1x AMD 7970 DCUII Top
1x ASUS R9 290X
3x MSI R9 290 4GB
2x Club 3D 7950 3GB

I also have 2x risers 16x -> 16x (unpowered) and 2x risers 1x -> 16x (1 powered)
The most important are the graphic cards that i have avaiable:

I know it's impossible to put all cards on 1 MOBO, but i want to get a safe maximum for this system.
If you get better ideas i can hook up 2nd PSU 650W and a adapter to start the system all at once.

Read some MOBO will burn when it pull too much wattage out of the mobo. That is my biggest concern.
I have SLI/Xfire Molex powerconnector on my MOBO. Can i use that to provide power to the PCIe slots or do i all powered risers. Also heard something about EVGA Power BOOST.

Anyway i would be very happy if some of u could help me out on which cards i need to use.
Many thanks for your time and help.

Don


 

[DrG]

4GB of system RAM?  Mixed cards?

You might be able to get the cards to mine, but it will not be optimal.

You should have 12-16GB with that many cards onboard.

[Abdussamad]

4GB of system RAM?  Mixed cards?

You might be able to get the cards to mine, but it will not be optimal.

You should have 12-16GB with that many cards onboard.

Not according to this guide:

http://www.coinminingrigs.com/quad-7970-mining-rig/

So who's right?

[takagari]

Let's highlight that for ya bud

RAM  - $50  -  4 GB Corsair DDR3 RAM

Litecoin Mining Rig Build Guide – 4x GPU Mining Rig

So, how many vidya cards you running again?

need a gig plus ram per card, for the lower cards. the newer stuff need's more!

[Abdussamad]

Let's highlight that for ya bud

RAM  - $50  -  4 GB Corsair DDR3 RAM

Litecoin Mining Rig Build Guide – 4x GPU Mining Rig

So, how many vidya cards you running again?

need a gig plus ram per card, for the lower cards. the newer stuff need's more!

Who is this post aimed at? DrG said you need 12-16GB for 9 cards. Actually I haven't mined before so I'd appreciate some clarity in this regard.

[coin123123]

power supply is your main bottleneck

[Abdussamad]

So it looks like this is a software thing. reaper uses much more system ram than cgiminer.

[ktbken]

4GB of system RAM?  Mixed cards?

You might be able to get the cards to mine, but it will not be optimal.

You should have 12-16GB with that many cards onboard.

you can mine with 4 cards per rig with even 2Gb ram you have not needed loads since  reaper

Under linux you can do it with just one