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Old 12th May 2016, 12:02 AM   #1
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Default GTX 950 VMod Worklog



Over the past few weeks I've been volt modding a Gigabyte GTX 950 Xtreme Gaming using a vero type prototype PCB

Some scores before I got into the modding





Now to begin with I did the memory mod which involves soldering a trimpot to ground on the FB pin of the PWM controller plus volt read points on the board







Now it came as a really big surprise just how well the Samsung GDDR5 scales with volts and this are with 1.85v





Next up I got LCD panel meter but the one I got has a min voltage of 8v by mistake so I put use reading the 12 volt rail on the GPU and I also added the trimpot for the GPU core and you might also notice the DVI screws I've hotglued to the trimmers as it makes them much easier to turn



Next I solder the trimpot to GPU cores PWM controller but with this it's soldered between the VREF and REFIN pins





So far still to go:
Add 2 12v LCD panel meters for GPU core and memory voltages
Resolder and neaten up the cables
Add a connector so the cables can be disconnected from the board
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Old 12th May 2016, 6:53 AM   #2
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Nice one mate
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Old 12th May 2016, 7:55 AM   #3
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been a while since I haven anyone doing this kind of thing !
keep up the good work !
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Old 12th May 2016, 8:36 AM   #4
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watching with interest!
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Old 12th May 2016, 12:49 PM   #5
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We need another shitty gpu modding comp...... I should finish my 8800gtx mod but damn i find those really small solder points hard.
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Old 12th May 2016, 1:04 PM   #6
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Coming to hwbot this July
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Old 12th May 2016, 5:13 PM   #7
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Thanks guys
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been a while since I haven anyone doing this kind of thing !
keep up the good work !
Cheers and the idea came from a old school overclocker called Massman

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Old 12th May 2016, 7:45 PM   #8
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Just because I forgot credit goes to Elmor for helping identify the mod for the core and to mllrkllr88 for the idea to use a prototype PCB

Also the card doesn't seem to scale past about 1.35v which I was running from a bios I modded at the beginning but it may come to use if I do something like this again with sub zero ice water
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Old 13th May 2016, 12:24 PM   #9
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Bit of an update as I just picked up some db9 male and female connecters and about $2 worth of wire plus a cheap 5 way crimp tool



And I ordered some lcd volt meter panels which should arrive next week
http://www.ebay.com.au/itm/161865645069

Edit: just noticed I only got charged for 1m per colour not 2m like I got

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Old 13th May 2016, 12:54 PM   #10
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What thickness cable do you use ?
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Old 13th May 2016, 1:01 PM   #11
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Quote:
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What thickness cable do you use ?
The cable I bought is 7.5mm (smallest jaycar had and 25c a meter and rated at 600ma) but I had been using at a guess 5mm which I salvaged from a firewire front panel cable which doesn't work with the wire striper part of the crimper as 7.5mm is the smallest it does

Edit: My bad it's 13x0.12mm
Edit 2: that's I think 13 strands by 0.12mm2 plus I'm shocking with wire sizes but I think that might be around 26awg

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Old 13th May 2016, 2:31 PM   #12
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Bit more of an update as the first db9 connecter is done



Some heat shrink tubing on the solder points



Heat shrinking the whole thing apart from ground



P.S. Click on pictures to make them bigger
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Old 13th May 2016, 4:32 PM   #13
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And another update

All the wiring on the prototype PCB is done but I somehow knocked the gpu core mod off because of being soldered to some tiny ass resistors so that isn't wired on the gpu side but is on the pcb side



I'm still going resolder and shorten the lcd panel wires plus cut back the wires on gpu side and make as neat as possible

Also I must say this turning out to be the single neatest thing I've ever done on my life
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Old 14th May 2016, 8:49 PM   #14
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Neatened everything up today and put the connector to a PCI-E bracket





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Old 15th May 2016, 10:35 PM   #15
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I ended up killing the card when the cores mods came off as it damage a trace But will be getting a new 950 Xtreme Gaming during the week and for the time being I've connected the board to a 560





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