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How to modify my vBIOS to accept a Maxwell core, upgraded from Kepler? Acer Aspire V3-771g


SAA

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Hello, I'm planning to upgrade the GPU on my Acer notebook from a GT650M  (GK107) to a GTX960M (GM107), and I have finally aquired all the tools + core that I need, but I'm missing one last thing. 

 

I need modify my vBIOS to accept a Maxwell core on my motherboard, as it is configured to Kepler cores. 

 

There exist no official version of my notebook with Maxwell-core GPUs, so no official compatible BIOS is available. 

 

I need to learn how to modify my BIOS for this purpose but I have no idea where to begin.

 

Could anyone here provide any guides on how to make this happen? 

 

Thank you, 

SAA

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@senso  I know how to solder, there is absolutely a way to put a 960m there . (Though that would be pointless at this moment, read below)

 

@Khenglish

The software I used specified the wrong vRAM in my system, leading me to believe that I had GDDR5 and therefore making me think a 960m is compatible. Research online regarding what were installed on my motherboard gave no results, so I had to open up the notebook to see for myself.

 

To my disappointment I discovered I had Hynix DDR3 vRAM on my motherboard, so a 960m is not compatible after all.

 

There exists, however, a version of the 950m that use DDR3 vRAM, but I'm having trouble locating the vBIOS online. I will do some further research into the issue.

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The gpu footprint is totally different, if you dont believe me, buy stencils for reballing, one for the 650m and one for the 960m.

I had the same idea, but a much smaller jump, from a 630m to a 640 or 650m, totally different, two extra rows and columns of solder balls.

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Sorry for replying late, I have been very busy with work.

 

@Khenglish You're right, the 850m also came with both DDR3 and GDDR5. IIRC I browsed through some discussions that a user had problems with a vBIOS because it had specified one kind of vRAM, while the user had the other kind. I found through binge-reading up on the subject, so I can't recall what site it was from. But better to be safe than sorry.

 

Are you saying flashing a 850m vBIOS (if I find one) could work if I had installed a 950m core?

 

@senso I have no doubt you encountered issues when trying to swap a G630m core to 640/650. The G630m uses a GF108 core, while 640 and 650 uses GK107 core. (Except for one kind of G640m LE version, which was made in 2 versions: GF108 and GK107. My understanding is that the BGA of these cores are different.

 

650m and 960/950m is GK107->GM107. The G*107 part would make them compatible. 

 

I am basing this on the limited avaible information around this forum and the rest of the internet, so some things may naturally be inaccurate.

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On 12/15/2016 at 8:29 PM, senso said:

The gpu footprint is totally different, if you dont believe me, buy stencils for reballing, one for the 650m and one for the 960m.

I had the same idea, but a much smaller jump, from a 630m to a 640 or 650m, totally different, two extra rows and columns of solder balls.

 

There are 2 different bgas for the low end cores. There's a smaller one that's low end only, and a larger one that takes some low end but is the same bga as the mid range cores.

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