I believe we can get 2.2 MH from the chips on the Fury so it will be like 4 Gridseed overclocked pods
Time for lunch, and after that, I'll set up the 2 Furys with server Psu and raspberry in the room with the other miners.
I'll report on the power draw too.

Some update to show you what I mean by serious cooling

The fan was from an HP DL580 G3 power suply, while I'm waiting for a new fan.
Makes same noise as a big vacuum cleaner, but it does the job very well.

Heatsinks are for VRM from arctic accelero L2 plus heatsinks I bent them to give a wider shape.








Still need to add some cardboard or something similar to close the sides where the fan was originally blowing So I'll have a nice airflow there too.

with the small extra fan plus heatsinks, you should be ok.
I cut an old VGA heatsink in 3 parts that each goes over 2 chips with arctic ceramique applied for the chips and under the board.
Plus a spare Gridseed blade fan blowing inside the Zeus heatsink.
Not sexy at the moment, but efficient until I find what I'm looking for as custom cooling..
I"ll measure watts used tomorrow. I do expect something in the 70 watt range
Time to sleep for now.

try my post just upside and tell me if it works

The formula is in the datasheet.

Or you can work the other way and replace the 9.3K one that is the reference resistor, just under the one I circled. I'll give a few examples, just time to setup excel

In the formula from the datasheet, R7 is th resistor I have swapped, R8 is just under it on the PCB with 93A marking

R7=0.591xR8/(desired voltage-0.591)

5.6K gives 1.57v
6.2k gives 1.48v
6.8k gives 1.4v
7.5k gives 1.3v
8.2k gives 1.26v

I measured a bias of +5% on my board. I haven't measured the R8 out of the board, but if it's slightly out bu 4 or 5% it could be the reason.
1.65v

for undervolting, if you want less power draw
10k gives 1.14v
11k gives 1.09v
12k gives 1.05v
13k gives 1.01v

Changing the R8 will also work
don't touch the 9.1k one, replace the 93A labelled one

10k gives 1.24v
11k gives 1.30v
12k gives 1.37v
13k gives 1.44v
15k gives 1.57v

for undervolt
6.2k gives 0.99v
6.8k gives 1.03v
7.5k gives 1.08v
8.2k gives 1.12v


picture to clear things up

stock is 92mm

Here we go for the list

Hardware and related used

I don't work with magnifying glasses, but with headlamp. If yo do need a lots of contrast like me, this one is really nice and throws loads of light and is cheap. Maybe cheaper on some other places.

http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=290990217612&ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

small tweezers will help for placing the smd too, something like these ones.
http://www.ebay.fr/itm/6PCS-Brucelles-Pincette-Pince-Tweezers-Antistatique-Metal-Courbe-Rond-Droit-/121204738469?pt=FR_YO_MaisonJardin_Outils_OutilsaMain&hash=item1c385d89a5[/b]]http://www.ebay.fr/itm/6PCS-Brucelles-Pincette-Pince-Tweezers-Antistatique-Metal-Courbe-Rond-Droit-/121204738469?pt=FR_YO_MaisonJardin_Outils_OutilsaMain&hash=item1c385d89a5

Soldering paste ZJ-18 one of the best cheap ones I tried so far.
http://www.ebay.fr/itm/Welding-Soldering-Iron-Solder-Flux-Paste-ZJ-18-50g-Wax-/220645967363?pt=UK_Home_Garden_PowerTools_SM&hash=item335f864603

Soldering station
Aoyue 937+ very good not so expensive one

Hot air rework station
BAKKU 858D
Cheap, but does the job.
My settings aren't the best ones, but they do work:
450°C (I know, it's way too high, but it allows me to work very fast)
Don't run the fan too high. 1 or 2 is enough most of the time. 5 will blow the 0402 and most of the 0603 SMD components off the board. Did I say not to go up to 8?

Standard mod
Resistors 0603 size 39k recommended, 43k is hardcore and dangerous, I'm running 44.2k.
can be found at mouser, farnell...

Heatsinks for cooling the mosfets under the PCB
37x37x15mm
http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=261310293222&ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
or 37x37x24mm (still waiting for them 5 weeks after puchase...)
http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=310945950478&ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

small heatsinks for cooling the mosfets on the top side
http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=251251434021&ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

Optional improvements

Replace the power plug with a screw terminal, 5mm pitch
http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=400667113340&ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
I had to slightly bend the pins of the terminal and drill the stock holes to 1.1mm

Replace ferrite beads with 0 ohm resistors, 1206 size
Axial ferrite beads might be better for safety, or resettable fuses. I ordered some and will test.

Replace Mosfets with new ones
Upper gate -> CSD16321Q5C one for each PCB unless you have the latest ones with an empty mosfet pad that you can populate.
http://www.mouser.fr/ProductDetail/Texas-Instruments/CSD16321Q5C/?qs=/qzd9s%252bcLd6BJ6oSO2jYyA==
TO-220 package IRFB7437 will also work with a nice AAVID thermaloy HF20 heatsink
http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=360922735855&ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
Lower gate -> CSD17556Q5B you will need 2 of them on each PCB
http://www.mouser.fr/ProductDetail/Texas-Instruments/CSD17556Q5B/?qs=%2fha2pyFadujmDrK04JvA9%2fUT5iDlW7l0ImBsWKDB2WI%3d

add heatsinks on the GC3355 chips will help getting lower HW errors.
same one used on the mosfets


Optional wide body mod

Scythe ultrakaze 130CFM fan
You will need to figure a way to attach it to the blade. I glued some 15mm M3 spacers at appropriate place to be able to screw it.

25mm PCB standoff / spacers to make the original ones higher
http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=281207608483&ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

Custom cut PVC cards to close the gap between the 2 halves of the blade size 220x120x3mm
http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=261480101060&ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649


My recommended power supply (I currently own 15 of those at home, counting a few spare ones)

Server power supply, 1300watt if powered with 220-230V

HP DL580 G3 / ML570 G3 power supply 364360-001 / 337867-001 337867-501 AA23530
Quite easy to mod, reliable, not too expensive, powerful, but loud as a vacuum cleaner.

Most of the fans you will find will come with 3 or 4 pins connector. You will have to keep only the black and red ones.
As for stock size, sorry, I upgraded to bigger one, Scythe ultrakaze.

I used this to choose mine

http://www.frozencpu.com/cat/l2/g36/c435/list/p1/Fans-12_Volt_Fans_by_CFM.html

The stock one is around 60cfm, don't go too low

I forgot to mention that every Zeus miner that you will mod this way will automatically send 10% of your earnings to my wallets 

the Fury isn"t pretty at the moment, just prototyping.

Beware, it runs very hot after modding, resistor values between 6.2 and 9.1k could give better results.

Power mosfets are rated 100A, so we should be safe

but here is the pic for the voltmod.

In fact, I did almost the same thing without seeing the thread. Arctic ceramique under the pcb and custom heatsinks on the chips plus fan blowing through like on the blade.

Since the brick was free and I was short of ready to use server psu, I wanted to try and see how far I could push it.

Not far...

I'll set up a hashra or similar raspberry image tomorrow for the tests and with a server psu.

9.1k resistor on the side of the Buck controler replaced with 5.6k one. edited the resistor from 6.2 to 5.6
Beware. The chips and the entire Fury/Blizzard will be very hot and you will need to add heatsinks to the chips and good thermal paste under the pcb.
Fan blowing through like on Gridseed blade also gives better cooling.

Looks like I'll be the first voltmodded on Zeus.
The updates on Zeus voltmod will be posted on the thread you linked to keep this one on Gridseed blade

Info on voltmodded Fury/Blizzard soon.
Running at Ltc clock 525 with less than 5% HW errors with cgminer. Bfgminer don't like it and gives way more errors.
Voltage upped to 1.65v
But you will need to seriously improve the stock cooling.
Also, use a serious power supply.
The one provided with the Fury managed to melt, as I expected it to do.

12v 5A psu melted. I believe I was drawing more than 60watt 

No schematics, No chips datasheet.

But it does hash at Ltc clock 525 right now with low HW errors compared to what you get stock. Something around 4%.
Cgminer 3.1 reports strange hashrate so I'll need to rely on a pool to estimate the gain.
Bfgminer gives me way more HW errors No matter what I try.

Just an hint on the voltmod, Zeus uses tps40193 as Buck controler.
2R030 power mosfet
Reference resistor is 9.3k voltage adjust resistor is 9.1k to get 1.2v
6.2k adjust resistor gives 1.65v on mine.

Unfortunately, the cooling on the blizzard/fury is not enough, maybe even at stock voltage. That is the reason for higher HW errors.

Just to tease you
New topic soon for first overclocked Zeus miner.
I received my miners 1 hour ago, first one already modded.

I'll do it this afternoon when I'll go on the computer. Too hard to do with the phone.

It makes sense, Blade will be entry level around 350-400$ in a few weeks, big blade with more PCB slightly more expensive, probably around 1000-1500$ and A2 for the most powerful miners from 2500 to 5000$.