List what hardware made you ROI and if it made you any profit.
1) GPUs: When I first got into mining a year ago I started with GPUs. ROI was suppose to be 2 months but turned into about 6 months, and the last 6 months was very little profit. However they got ROI and most of the GPUs were sold at 50% from the retail price. So in the end what looked like a huge loss turned into some marginal profit.
![](https://ip.bitcointalk.org/?u=http%3A%2F%2Fcdn.pcpartpicker.com%2Fstatic%2Fforever%2Fimages%2Fproduct%2F14b8f915898f6cb0c38a060a84c761f5.med.256p.jpg&t=663&c=K66niA3NKxpmtw)
2) Antminer S3+: When BTC/USD crashed at the beginning of the year approaching $150 USD. I managed to get a few miners for the cheap. They got ROI very fast at just a little over a month. I am still making good daily profits off them. I bought them used, didn't pay retail.
![](https://ip.bitcointalk.org/?u=http%3A%2F%2Fcryptomining-blog.com%2Fwp-content%2Fuploads%2F2014%2F06%2Fbitmain-antminer-s3-asic-miner.jpg&t=663&c=C4k7Tb2yxypArg)
3) KNC Jupiter: I love these miners. Many were getting rid of them locally because they are very power hungry. I love how they are rock solid, stable, and they are almost silent. I got ROI of them just under 2 months and they are still making me good daily profits. They were bought used, didn't pay retail.
![](https://ip.bitcointalk.org/?u=http%3A%2F%2Fwww.crypto-ops.com%2Fwp-content%2Fuploads%2F2013%2F10%2F5421_big.jpg&t=663&c=I4ojmI2O-VR2fg)