In response to your PM, yes I had no problem with this store I buyed a 30 gh/s first and some weeks later a 104 gh/s my only complain is lack of documentation and information related to overclock and some minor problems (crash) in the 30 gh/s..but my tracking always showed my orders correctly.. i think if your package was lost for 2 days at the courier that maybe the source of your problems, 1 time i bought gpus, motherboards and cpus from a well known store named pixmania (www.pixmania.com) and when i received the package I had only 1 motherboard inside it take me 3 months to fix the issue...

They are legit, or at least my order in last september was delivered, meanwhile i found out they have a reseller at europe (www.sinosigma-europe.com), which is more fast to deliver to EU because there is no need for customs, so i'am not buying anymore directly from china, my last orders were from the europe partner (the only problem is sometimes their stock ends and they only have available 1 month later).

If you want to buy in europe there is www.sinosigma-europe.com they sell chinese asic miners  and they have stock in europe, i have buyed the 104 gh/s box in last december.

http://www.sinosigma-europe.com/index.php?route=product/product&product_id=54 104 gh/s.

I don't know the watts consumed, but i know the psu is 800 watts.

www.sinosigma-europe.com -> accepts credit card and bank transffer.

http://www.butterflylabs.com -> accepts bank transffers.

Don't buy in stores that use bitcoin as main payment method, a store usualy uses country currency like us dls or euro, if you are in europe i can recomend the store i bought my 104 gh/s the address is www.sinosigma-europe.com in US i have some friends how bought from http://www.butterflylabs.com they had some delay because they bought pre-order equipments but everything went fine.


 

There is no point at this dificulty level to use gpus to mine, you should buy asics.

If you live in europe this shop has good prices www.sinosigma-europe.com, if you live in us or asia use alibaba sinosigma store.

Regards,

Marcos.

I buyed a 104 gh/s system in here http://www.sinosigma-europe.com/index.php?route=product/product&product_id=54 now i want to overclock it, does anyone nows howto do it and what is the safe "overclock" i can do? i now some people say this system can run a 114 gh/s with no problem.

I'am asking this because the store doesn't recomend me to it.

Tks.

Marcos