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hi, please help me in choosing of hardware best suited to operate ati 5830s.

for start ill prolly go for only 1 or 2,
my main wuestion is what mbo should i choose.
i plan to use this rig only to mine for coins and my company is paying for electricity so thats not an issue.

i planed something like

5830
1gb ram - why more?
no hdd - instead id use usb flash with live windows or linux ..
crappy cpu and mbo - will crappy mbo affect my performance in mining?

pls help me out a bit, im planing to invest about 800$ and parts are a bit more expencive in my country so calculate 20% more on usa price.

thanks

In all honesty you probably only need to make sure the mobo has enough pci express slots to fit the amount of cards you want. You forgot a power supply in your list. Don't skimp on this as it can destroy all your equipment. Also you should get 2 gigs of ram if you use windows 1 gig for linux.

are there any mbo that would be the best / cheapest but also smartest choice ?

If you want the cheapest mobo you can get Id recommend just going with the cheapest mobo a well known brand offers. Just keep in mind most gpu's take up two spots so the pci express cant be right on top of each other. However if you ever plan to expand to more then 2 cards id recommend something like this:
http://www.newegg.com/Product/Product.aspx?Item=N82E16813130274&Tpk=13-130-274

The reason being the pci express slots are spaced out quite a bit which makes 4 gpu's possible. Some mobo's may say they have 4 pci express slots but in reality they can only handle cards that only take up one spot.

Newegg -> Sort by: Lowest Price

There you go, the cheapest motherboard!

I am building my rigs with this MB as the base: http://www.newegg.com/Product/Product.aspx?Item=N82E16813154018

4x PCIe slots that are correctly spaced so you can actually put dual-slot cards in. That's something to be aware of when buying boards - some don't have a slot between each PCIe slot, so your density suffers.

I don't think that is what the OP consideres "cheapest".

I'm working with two MSI 790FX-GD70 - good price for four PCI-E slots. If you still can get it somewhere, go for it, but MSI replaced it with the 890FXA-GD70 which is still very good but costs a bit bit more due to new features which you won't need for mining.

The thing I like with the 890FXA-GD70 is that it, in addition to the 4-card setup, it allows for a 3-card setup with extra spacing between cards.

Ive had good luck with ASUS MB, there overclocking utility will help you out a bit also in this.

You don't really have to worry about getting the greatest motherboard, you can run all this hashing on PCIx1.

Yea I guess that does make sense, dont really need to transfer the data fast. However I was more referring to the reliability part, don't want a MB that will dies in a couple of months.

just make sure you have enough power going to it and if its a cheap motherboard look at supplementing the power the gpus will draw from the motherboard itself as well