I'm going to be hardware modifying my boards when I get them. If you're doing the pencil mod using a graphite pencil you'd modify resistor R02F to get a lower ohms reading between 1.1k-1.2k ohms. From my reading it appears this increases the voltage.
Now if I'm actually going to be desoldering and from reading c-scapes post it seems to be better to desolder R01F resistor and increase the resistance to 1.5k ohms which bumps the voltage from .65v to .70v.
Is there a reason why one should hardware mod R01F resistor over hardware modding the R02F resistor. To me it appears both mods accomplish doing the same thing, that is bumping up voltage which increases clock speed.
R01F resistor I'm looking at getting. Which of these 3 would you recommend. I know the thin film resistors are typically more precise at .5%, or should I go with the thick film 1% tolerance that can handle more wattage. I wasn't sure of the minimum resistor wattage recommended.
Thin Film low watts 62.5 mW
http://www.mouser.com/ProductDetail/Susumu/RR0816P-152-D/?qs=%2fha2pyFadujrU2xFewWLBjwEx2mjC6RiRlpijhODKY4%3dThick film high watts 250 mW
http://www.mouser.com/ProductDetail/Vishay-Dale/CRCW06031K50FKEAHP/?qs=sGAEpiMZZMu61qfTUdNhG9YJum83zc0DZxAhkoNdosw%3dThick film 100 mW
http://www.mouser.com/ProductDetail/Vishay-Dale/CRCW06031K50FKEA/?qs=sGAEpiMZZMu61qfTUdNhG7Gzy2l2IcrzI0BRrlOBedI%3dAlso I believe their is an error here. In the picture below it says R02F resistor is 10k ohms but right below that it says for the pencil mod to verify it is 1.3k ohms. I bolded the words in orange so others can verify this
Note: if you accidentally mess up the capacitor next to the resistor (C10F), and you wish to replace it, use 1nF, 50V, X7R type.
Similarly, resistor R02F is 10k, 1%.
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a) Get an Ohmmeter or DMM
b) Get an HB or softer Pencil
c) Locate R02F resistor. Donot mod R01F.
d)
Make sure R02F measures 1.3KOhm
e) Rub pencil on the surface of R02F 3 - 4 times
f) Measure resistance, if it's 1.2K plug the board in
g) Measure output voltage, and repeat steps e,f if necessary for fine-tuning
h) Hash like a
boss i got those pictures sent from a user ...
to guide through the process of the pencil mod ....
***be aware that you loose warranty of the h-board in doing this ... and you can brick your board!!!***details:- temp +10-15°
- 1.6 times higher electricity needed
- up to 50% increased hashrate
Step 1: unplug your h-board ... and locate the R02F Resistor
Step 2: use ur multimeter on the resistor and verify that it shows 1.3k Ohm
Step 3: use a HB (medium grade) pencil (
http://en.wikipedia.org/wiki/Pencil) and rub 2-3 times
Step 4: use ur multimeter on the resistor and check how much it was lowered in resistance ...as long as your higher then 1.2k restart step 3 & step 4 ... if it is under 1.2k just swip a little with your finger ...