Project

General

Profile

Feature #1157 » mod_mxw.txt

tin, 09/22/2014 12:03 AM

 
1
Uncorking NVIDIA Maxwell on reference GeForce GTX 980/970
2

    
3
Those who followed up with us on NVIDIA GAME24 event, already know that new beast, NVIDIA Maxwell GM204 GPU is well capable of capturing some serious scores with extreme overclocking and liquid nitrogen cooling help.
4

    
5
We used "EVGA GeForce GTX 980":http://www.evga.com/articles/00872/EVGA-GeForce-GTX-980-970 reference cards together with "EVGA EPOWER":http://www.evga.com/Products/Product.aspx?pn=100-UC-0400-BR VRM module to reach out fearsome 2067 MHz clocks stable and clean over 3Dmark benchmarks :).
6

    
7
No doubt, modifying your GTX 970/980 to for these kind of results is not a five minute job and require some above-minimal soldering skill knowledge. Those heavy overclockers who are into this already got their EPOWERs, copper clads, soldering tools and Maxwell cards on operation table, but today here we talk about more broad range of pips, who just wanna max out Maxwell with simple trimpot modifications to bump voltages for everyday overclocking on air/water or even mild extreme cooling. We will also talk a little about removing power limits and overheat thermal protection
8

    
9
Be very well aware, that even little simple mod, basically anything below this paragraph in this article is NOT covered by any kind of warranty, and provided AS IS, without any support from manufacturer or NVIDIA. You are on your own here, folks, so "don't try this at home".
10

    
11
Okay, enough talk, let's blow it up! :)
12

    
13
h3. STEP 1
14

    
15
We will need basically next to get our successful modding of reference GTX 980 card.
16
Modification of GTX 970 follows same idea, but since layout is different, at this moment you will have
17
to find exact way by yourself. I'll focus on GTX 980 first. 
18

    
19
* Card itself. We got two EVGA GEFORCE GTX 980 (04G-P4-2978-KR) cards to play with.
20
* 3 x 50 ohm multiturn VRs (trim pots).
21
* 25-45W soldering iron for trimpot mods.
22
* Roll of 28-32AWG insulated wire
23
* Soldering FLUX
24
* Kingpincooling TEK9 FAT (don't forget who's forum is here, yes we use only KPC cooling for our LN2)
25
* DMM (I use my trusty Fluke 87V and Keithley 2002, but any DMM can fit this needs)
26
* Low-ESR capacitors (2.5 or 4V rated, 680-820uF , etc) if you like, but not required.
27

    
28
Since we don't cover EPOWER connection to card this time, we don't need to use high-power soldering iron,
29
so pretty much any soldering gear you have on table will fit the task.
30

    
31
I got an upgrade for my personal gear setup, so from now soldering with ERSA iCON-1 soldering station with 120W capable soldering. I used 102CDLF2.4 tip for this guide, temperature set to 290C.
32

    
33
Clean your mess on table, get all tools checked and ready, turn on enough lights to clearly see tiny parts on PCB. Your setup should look like next:
34

    
35
"!http://trash.xdevs.com/evga/980/small/setup.jpg!":http://trash.xdevs.com/evga/980/setup.jpg
36

    
37
h3. STEP 2.
38

    
39
Remove cooler from the card, since we need access to front of PCB.
40
This time NVIDIA did not use TORX, so usual philips will do just fine. Better keep all those custom screws
41
in secure place together, so you can put heatsink back after you done if you will decide to do so.
42
Remember, after soldering your warranty will be surely violated, as every RMA center will easily see non-factory soldering specks, even if you very careful ;)
43

    
44
"!http://trash.xdevs.com/evga/980/small/gtx980_face.jpg!":http://trash.xdevs.com/evga/980/gtx980_face.jpg
45

    
46
Our table now looks like this:
47

    
48
"!http://trash.xdevs.com/evga/980/small/card_back.jpg!":http://trash.xdevs.com/evga/980/card_back.jpg
49

    
50
Primary areas to see are: Green - GPU voltage controller, Red - memory voltage controller area:
51

    
52
"!http://trash.xdevs.com/evga/980/small/gtx980_vrd.jpg!":http://trash.xdevs.com/evga/980/gtx980_vrd.jpg
53

    
54
h3. STEP 3.
55

    
56
Prepare VR's. Find 50 ohm nominal resistance multiturn variable resistors (potentiometers). I use very common blue square 3296 type.
57

    
58
"!http://trash.xdevs.com/evga/980/small/trimpots.jpg!":http://trash.xdevs.com/evga/980/trimpots.jpg
59

    
60
Use your DMM to turn pot all way to the max, so you will start from lowest bump on voltage after card is powered on. We will add them to adjust three main rails present on card:
61

    
62
"!http://trash.xdevs.com/evga/980/small/check_trim.jpg!":http://trash.xdevs.com/evga/980/check_trim.jpg
63

    
64
h3. STEP 4.
65

    
66
NVVDD trim-pot mod
67

    
68
Need to remove two resistors marked on photo below to enable adjustment on feedback sense.
69

    
70
"!http://trash.xdevs.com/evga/980/small/vrd_premod.jpg!":http://trash.xdevs.com/evga/980/vrd_premod.jpg
71

    
72
Now add 50 ohm trimmer to point as shown on photo below. Solder middle terminal of trimmer to marked point with thin AWG28-32 wire.
73

    
74
"!http://trash.xdevs.com/evga/980/small/vrd_points.jpg!":http://trash.xdevs.com/evga/980/vrd_points.jpg
75

    
76
Solder second terminal of trimpot to ground nearby (you can use mounting hole for that, they all grounded as well).
77

    
78
You can go as high as 1.7-1.85V with this kind of modification, so it's suitable for extreme overclocking.
79
But beware, safe voltages even on LN2 are rather around 1.5-1.6ish range, which is still enough to get decent overclocking on most of the cards. 1700-1800MHz clockspeeds should not be an issue.
80

    
81
Resistance at marked point on non-modded card is about 90-110 ohm with resistors removed, and about 4-8 ohm with resistors present.
82

    
83
h3. STEP 5. 
84

    
85
FBVDD (memory) trim-pot mod
86

    
87
"!http://trash.xdevs.com/evga/980/small/mem_point.jpg!":http://trash.xdevs.com/evga/980/mem_point.jpg
88

    
89
Add 50 ohm trimmer to point as shown on photo below. Solder middle terminal of trimmer to marked point with thin AWG28-32 wire.
90

    
91
"!http://trash.xdevs.com/evga/980/small/mem_trim.jpg!":http://trash.xdevs.com/evga/980/mem_trim.jpg
92

    
93
Solder second terminal of trimpot to ground nearby (you can use mounting hole for that, they all grounded as well).
94

    
95
Resistance at marked point on non-modded card is about 25-30 ohm.
96

    
97
h3. STEP 6.
98

    
99
PEXVDD (PLL) trim-pot mod
100

    
101
PLL controller located near memory chips and PCIe edge connector.
102

    
103
"!http://trash.xdevs.com/evga/980/small/gtx980_vrm.jpg!":http://trash.xdevs.com/evga/980/gtx980_vrm.jpg
104

    
105
"!http://trash.xdevs.com/evga/980/small/pll_point.jpg!":http://trash.xdevs.com/evga/980/pll_point.jpg
106

    
107
Add 50 ohm trimmer to point as shown on photo below. Solder middle terminal of trimmer to marked point with thin AWG28-32 wire.
108

    
109
"!http://trash.xdevs.com/evga/980/small/pll_trim.jpg!":http://trash.xdevs.com/evga/980/pll_trim.jpg
110

    
111
Solder second terminal of trimpot to ground nearby (you can use mounting hole for that, they all grounded as well).
112

    
113
Resistance at marked point on non-modded card is about 170-180 ohm.
114

    
115
h3. STEP 7.
116

    
117
Check all resistances, and make sure everything is correct. All trimmer points must not be below 1 ohm, or you will get too high voltage on your rail, which can damage card very quick.
118

    
119
"!http://trash.xdevs.com/evga/980/small/trimmers.jpg!":http://trash.xdevs.com/evga/980/trimmers.jpg
120

    
121
You can find grounds with your DMM by checking resistance. If you see less than 0.5 ohms (absolute) resistance between mount hole and your point - pretty sure it's ground.
122

    
123
h3. STEP 8.
124

    
125
Now we can remove power limit via hardware mod. I already covered this multiple-multiple times in previous guides, so i see zero point to repeat it over once again. So just short three shunts with piece of copper or solder blob, and you good to go, now your power limits will never be an issue on any clocks or voltages.
126

    
127
I'll just show you shunt resistors locations here:
128

    
129
"!http://trash.xdevs.com/evga/980/small/pwr_shunt1.jpg!":http://trash.xdevs.com/evga/980/pwr_shunt1.jpg
130

    
131
h3. STEP 9.
132

    
133
Assemble your cooling solution to a card, test voltages and give it a spin on overclocking, using "EVGA Precision X 16":http://www.evga.com/precision/.
134

    
135
h3. STEP Bonus.
136

    
137
For die-hard EPOWER guys, like our friend in Brazil, here's magic sauce to enable EPOWER function on this cards:
138

    
139
Locate VRM module with ONsemi NCP81174 chip, located on little board soldered to GTX 980 PCB.
140

    
141
Cut two traces marked red on photo below. Make sure not to cut anything else :D.
142

    
143
"!http://trash.xdevs.com/evga/980/small/gtx980_epower_magic.jpg!":http://trash.xdevs.com/evga/980/gtx980_epower_magic.jpg
144

    
145
Now you can solder your EPOWER to GTX 980, and it will work just fine, exactly like it was on GTX680, GTX780, Titan, GTX780Ti, GTX770 and so on.
146

    
147
"!http://trash.xdevs.com/evga/980/small/wr_card.jpg!":http://trash.xdevs.com/evga/980/wr_card.jpg
148

    
149
Have fun, and don't forget to post scores and push for records.
150

    
151

    
152

    
153

    
154

    
155

    
156

    
157

    
158

    
159

    
160

    
161

    
162

    
163

    
164

    
165

    
166

    
(2-2/2)