thank you i recalculate the price of a mhash and it is not very different for configuration 1 and 2. I will begin with the simple configuration

About the software, what is the best architecture ? gpu works for different pool ? a local server connected to pools ? other way ?

Hello,

I am an european IT professional and I created a few more or less successful companies for 10 years.

I think to create a mining company because I believe bitcoin could be a success.

I plan to install 1 and after 10 and after 50 miners and see the results.

I need help on the hardware and software.

Hardware, I am working on two configurations :
 1/
- motherboard : ASRock ALiveXFire-eSATA2 (AMD 480X CrossFire) - ATX (50$)
- proc : AMD Sempron (37$)
- gpu 2 * 5830 (108$*2)
- noname memory, hdd (or usb stick ?), Seasonic 500w
- case ? The only pro solution I found is a 4u antec rack but it costs 350 with 650w psu

So the total cost of this miner1 is 475$ with a standard box or 730$ with a 4u rack

2/
- motherboard : Asus P7P55
- proc : Intel Pentium G620
- gpu 5 * 5830 (108$*2)
- which psu do i need with this kind of configuration ?

So the total cost of this miner2 is 1110$ with a standard box or 1400 $ with an Antec 4u rack

Any opinion and improvement on these configurations ?

i will have question about software after...