This is for a Dell Optiplex 755 which is in good working condition.  This is for the computer only which is a small form factor model.  Has Windows XP pro installed and the the XP pro sticker still on the case.   Asking for 13.5 BTC which includes shipping.  US only.





Intel core 2 duo 2.0 ghz processor
3.5 gigs ddr 2 ram
80 gig HDD
DVD drive

I'm currently using the Antect TPQ-1200w http://www.newegg.com/Product/Product.aspx?Item=N82E16817371032 for one of my mining rigs.  I was wondering what people thought would be a good amount a cards for it without over doing it?  Currently I have 2 5970's on it.  I have a few other cards I could add.  I have 1 6990, 2, 7970's and a few 5870's.

Im currrently using this motherboard BIOSTAR A870U3, http://www.newegg.com/Product/Product.aspx?Item=N82E16813138318 with this processor AMD Phenom II X4 925 Deneb 2.8GHz Socket AM3 95W Quad-Core Desktop.  The Os on the system is winXP pro 32 bit, with the ati 11.8 drivers( tried 11.7 also).  Here is the issue I'm having if I just put 1 video card in the system it works fine but when I add a 2nd it seems to cut the mining speed on the cards down by about a 1/3.  If I tell it to stop mining on 1 of the cards the other goes back to full speed.  I've tried different cards,and  an Sempron 145 and I connected another power supply up to it which is 1000w's to just rule out that stuff.  I've also tried with the poclbm-GUIminer and CG miner.

I'm pretty new to this stuff so I'm not sure what I'm doing wrong.  I do have another system which has 3 video cards in it and it's all working fine.  It's running windows 7 though but I just can't figure out the issue with this one.

Hey, I was wondering if anyone had any experience with this power supply?   It looks like for that price it is a pretty good deal.  I wouldn't need 1000w's right now but I thought it would give me the option of expanding more later.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817182188

Hello I'm pretty new to bitcoins so I'm hoping someone can help me.   Currently I'm using this Motherboard http://www.newegg.com/Product/Product.aspx?Item=N82E16813138318 with this processor http://www.newegg.com/Product/Product.aspx?Item=N82E16819103944.   I have a 5770 and a 4870 on it using a 630wpower supply.   Just mining with the 5770 I get a little over 200 mhash, just mining with the 4870 I get about 80 mhash.  But when I start mining with both at the same time the 5770 drops down to about 120 and the 4870 drops to about 40. 

Anyone know what could be causing this?

Hello, I'm new to Bitcoin mining and was hoping someone could help me out with this problem.  I have 1 computer that has 2 of the MSI 6950's in it and if I try and do something while its mining the computer usually just locks up.  I'm running Windows 7, with the 11.7 drivers, using the Guiminer.  I'm not sure if there is a flag or something I need to put in to help this?  And I don't have the video cards overclocked or anything.