Originally Posted by racer86
hmm ill look at 7950s when i mined litecoin on my 5870s before I was around 300-350 although admittedly I haven't tried recently. any idea what the ROI time on the 7950s is now a days?
and if i go gpu i wont mine bitcoin its just not worth it anymore from what ive seen it would be better to save up $2500 and get a 30-40gh/s asic machine off of ebay
also how are the USB miners not worth it anymore? from what i saw 333 from a $20 usb stick isnt bad they also have some 2.2gh/s 2nd gen usb sticks up for $160 now. Are there just too many asci machines coming online now?
First of all, don't look at buying anything for bitcoin. You'll never pay off your machine with mining anymore, even with the newest machines, or the cheapest USB miners. A 30GH/s miner won't produce $2500 worth of bitcoins ever either.
I'd go with a 7950 if you're looking to buy equipment and mine on multipool. You'd pay off your card in 2-3 months using this method.
@ivan, there are definitely better cards out there now but the 5870's are still great for mining, 5970's as well. A 5870 is pretty close to a 7850 in terms of performance, it does around 40-50KH/s more than a 7850, while only taking about 30W more. And 1GB of VRAM is enough, people are using 7790's and 7850's with 1 GB VRAM and mine with them, no problems.
And compared to a 7950, a 7850 is exactly half performance of a single 7950 (I've found this from testing) and 7950's use around 180-220W I've found as well, so again, I think 5870's are still good mining cards.
So OP, definitely don't get rid of those 5870's, they'll net you around 0.05 BTC per day mining on multipool minus power costs (probably around $2) so you'd be making around $4.50 per day with three of them. That and a new 7950 and you'd pay the 7950 off pretty quickly.