Best SETUP to reach 20MH/s?

[DarkMiningBTC]

trying to reach around 20MH/s but I'm stuck on exactly what to go for, I'm thinking using r9 290's or maybe r9 270's not sure how much is the best bang for the buck :/ Any recommended rig specs to reach 20 MH/s?

[mikeybit]

290's or 280x's are the way to go.  280x get you the best bang for your buck but you'd need to build a few more systems to get equal hashpower. 

280x's will get ~700 kh/s on stock settings
290's will get ~ 850-900 (but generate far more heat)

290s require much more airflow and possibly water cooling to keep running for long periods of time.

[majkara]

R9 290s if you can tolerate the immense fan noise with 100% setting...that will keep them sufficiently cool, but will make your ears bleed

[IchibahnSLC]

12 rigs with r9 270s would be my way to go, not the 270x.  Each 270 will do about 420 khash which means each rig will do about 2mhash/s. Price per 270 is less then half of a 280x with the current market. Yes a 280x would be sweet, but they are just way overpriced right now.