Post
Topic
Board Mining (Altcoins)
Re: GridSeed 5-chip USB miner voltage mod
by
poopypants
on 29/03/2014, 17:47:38 UTC
- Enable VID1: Short R336 (original VMOD)
- Increase DVDD to 1.4V: Cut R46 (0R jumper) and replace with 2.94k
- Increase VDD_PLL to 1.2V: Add 27.4k on top of R212 (27.4k || 10k = 7326R)

For reference, the default VDD_PLL is 0.8 x (R211 + R212) / R212, or 1.092V.

Not getting HW errors at 1000 MHz, but I haven't tested long term because I only got my units yesterday. I'm sure 1100+ could be achieved by increasing DVDD using the above method.

It's currently stable (no HW errors, short term) at 1250 MHz (529 kH/s) at 1821 mV, with R46 being 14.7k.

Here are my R46 values and measured DVDD:

Resistance (R)Voltage (mV)
4.32k1450
5.90k1509
7.79k1581
12.1k1734
14.7k1821

I think I'll stop there before I damage anything Smiley

Edit: here is a microscope shot of the mods
Blue: R336
Green: R46
Purple: R212


If I wanted to run mine at 1150 stable, which resistor values should I use on R46 and R212?  I appreciate your picture and the risk you put in finding this mod.