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Voltage mod for laptop gpu?

post #1 of 6
Thread Starter 
Hello ,
I am thinking about to open laptop to identify chip that controls gpu voltage and may need some assistance if it is possible to put variable resistor or do pencil mod.
Laptop is dell studio 1749 with gpu hd 5650m, original 1v i am able to reach stable 760mhz core from 550 that was standard on my laptop,
Would be good to get it between 1,1-1,2v and test if it would allow increased frequency.
I have already unpacked system bios and i found gpu bios packed into it, edited it to 1,1v and 650mhz core but it didnot work out as it forced 250mhz and 0,9v profile, only core changed after had reflash it with 1v and 650mhz so it would change performance profiles.
It automaticly switches between 0,9 and 1v depending on profile.
temps stay below 63 with oc usually and without oc about 57 or below.
If i would provide image to get help with pins, resistors and do mod on resistors if possible then would it show real voltage under windows or it would show 1v that was standard? Is only way is to use multimeter and make sure?
Temp increase would also indicate that but i am asking because i have no previous experience with laptops ,but i probably could do soldering as i have done small resistor swaps on car ecu.
post #2 of 6
It would not be advisable that you do that because of the low voltage tolerances inside a laptop. Also, I don't think the voltage regulatory system would be able to handle the load that well. Plus overclocking a laptop is not really wise idea either. Laptops run hot as their in the first place.
Edited by Lord Xeb - 11/27/12 at 8:15pm
 
Gsvlip Dudyrm
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Oda'maksv
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Gsvlip Dudyrm
(15 items)
 
Oda'maksv
(9 items)
 
CPUMotherboardGraphicsRAM
3770k @ 4.5 1.312 load Zotac Z77 ITX Wifi GTX 1070 Gaming 2126/2249 w/ Hybrid cooler TridentX 16GB 2400MHz 
Hard DriveHard DriveCoolingCooling
Samsung 850 Pro 1TB Seagate 2TB H105 EVGA Hybrid GPU cooler 
OSMonitorKeyboardPower
Windows 10 Asus MG279Q - 24" 144Hz 1080p Filco Majestic II w/ Cherry Reds Seasonic X 760W 
CaseMouseMouse PadAudio
Bitfelix Prodigy Logitech G400 Razer Goliath AKG A701 
AudioAudio
JDS Labs Objective 2 JDS Labs ODAC 
CPUMotherboardGraphicsRAM
Core i5 750 3.99 (190x21) 1.376v Load ASUS P7P55d-E Pro GTX 670 FTW <- Poor overclocker :( 8GB (4x2GB) G.Skill DDR3 1600 
Hard DriveHard DriveOptical DriveOS
Samsung 830 Evo 128GB 2x 2TB  Some DVD drive OSX 10.10.4 
MonitorPowerCaseMouse
Asus 1080P Crap TX 750 HAF 922 G400s 
Mouse PadOther
Apple Keyboard Xbox One controler 
CPURAMHard DriveHard Drive
C2D 2,26GHz under volted @ .978v 8GB  Crucial M4 64GB SSD 500GB Scorpio Black 
OSMonitorKeyboardMouse
OS X 10.0 1280x800 Built-in Trackpad 
Audio
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post #3 of 6
Thread Starter 
Could someone help to spot voltage regulator for gpu on these images?
http://imageshack.us/g/838/dsc05597bu.jpg/
I am thinking about to try pencil mod if it turns out that regulator can handle bit more.
post #4 of 6
Thread Starter 
ISL6268CAZ-T seems to be gpu generator on that board.

http://pdf1.alldatasheet.com/datasheet-pdf/view/179862/INTERSIL/ISL6268CAZ-T.html
Wide input voltage range: +7.0V to +25.0V
• Output voltage range: +0.6V to +3.3V
• Wide output load range: 0A to 25A
It seems that fb and gnd pin has a resistor that controls voltage, il try to use pencil on that and see if it changes anything.
Edited by ococ - 11/28/12 at 5:33am
post #5 of 6
Thread Starter 
it seems to be wrong way to do it, maybe someone can sugest something else to try?thumb.gif
also i know my cpu clock generator but it aint suported in set fsb, is there any custom way to make it accessible?
Edited by ococ - 11/28/12 at 2:47pm
post #6 of 6
Thread Starter 
new thermal paste allowed me +30 mhz core and i put paste between thermal pads for mem also.
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