Quote from: shangri on October 23, 2014, 01:50:51 AM

Quote from: daddyfatsax on October 22, 2014, 06:14:24 PM

So how did you get to 3.2 TH/s from 2 Prismas? From your pic you have 16 boards, each Prisma shows up as 8. Right now people are only getting 1440 GH/s per device. So you guys must be overclocking these pretty high.

Cooling and psu it's very important, if you use psu with stable 12v line and heatsink with square around 4000 cm^2 chip works without problem on frequency 270 MHz it's not overclocking. We geting 3.5 thash with same power consumption on 290 MHz when outside was very cold. Maybe prisma couldn't work stable with computer PSU, because after losing on the cables voltage on conectors can be 11.4v - 11.5v it's not important when you use dc\dc, but then we talk about string design it's very important, because voltage separate between chip. Maximal what possible getting from 1 boards around 480 Ghash if use higher voltage.

That is right, when temperature in Shenzhen dropped down o 23 C degrees, we've got better hashrate.
It seems like causality, not just correlation.

We didn't try to use mine on 290Mhz, nice idea. We gonna try today. Thank you for advice Wink