Jump to content
Latest News
  • Apologies for the downtime. We had to update our backend and theme.
  • We will continue pushing updates.
  • Apologies for the downtime. We had to update our backend and theme.
  • We will continue pushing updates.
  • Sign in to follow this  

    NVIDIA GTX 980M Hynix to Samsung Memory Swap


    Khenglish

    So I didn't like that the memory on my 980m only clocked to 6.4 GHz after raising the voltage to 1.48V from 1.35V, and wanted my memory to run even faster. I knew someone with a spare 970, so we made a deal where I buy the card, and if it still worked after I switched all the memory chips, he'd buy it back (for reduced amount if it could no longer do 7GHz, but at least 6GHz). Long story short, he bought the card back and I got faster memory.

     

    MSI 970 4GB Lightning original memory: Samsung K4G41325FC-HC28 (7GHz rating, 8GHz max overclock)
    MSI 980m 4GB original memory: Hynix H5GQ4H24MFR-T2C (6 GHz rating, 6.4GHz max overclock)

     

    Both cards are GM204 chips. The 980m has one less CUDA core block enabled than the 970, but it has the full 256-bit memory interface and L2 cache with no 3.5GB issues, while the 970 is 224-bit with 1/8th of the L2 cache disabled. Both cards are 4GB with 8 memory chips.

     

    I highly suspected this memory swap would work because video cards read literally nothing from a memory chip. There is no asking for what the chip is or even the capacity. They write data to it and hope they can read it back. Memory manufacturer information read by programs like GPU-z isn't even read from the memory. It's set by an on-board resistor. I also had changed multiple memory chips in the past, so was fairly confident I could physically do the job.

     

    I started with just one chip switched from both cards. This meant both cards were running a mix of memory from different manufacturers and of different speed ratings, but same internal DRAM array configuration. Both cards worked. Here is a picture of the 980m with one chip switched over:

     

    JXVyaWy.jpg

     

    Now how did the cards react? The 980m behaved no differently. No change in max overclock. The 970 though... I expected it to be slower... but...

     

    970 with 1 Hynix chip, 7 Samsung (originally 8 Samsung)
    7GHz = Artifacts like a crashed NES even at desktop
    6GHz = Artifacts like a crashed NES even at desktop
    5GHz = Artifacts like a crashed NES even at desktop
    2GHz = Fully Stable, 2d and 3d

     

    I didn't try 3GHz or 4GHz, but yeah, HUGE clock decrease. I shrugged though and kept switching all the memory figuring that as long as it worked at any speed, I could figure out the issue later. With switching more chips through 7/8 switched there was no change in max memory clocks.

     

    What was really fun was when I had 7/8 chips done. My GDDR5 stencil got stuck and ripped 3 pads off the final Samsung chip. Needless to say there was a very long swearing spree. Looking up the datasheet I found that 2 pads were GND, and a 3rd was some active low reset. Hoping that the reset was unused, I checked the 970's side of the pad and found it was hardwired to GND. This meant the signal was unused. I also got a solder ball on a sliver of one of the GND pads that was left, so I was effectively only missing a single GND connection.

     

    I put the mangled 8th chip in the 980m and it worked. Net gain after all of this... 25 MHz max overclock. Something was obviously missing. I figured I would switch the memory manufacturer resistor, hoping that would do something. I saw that Clyde found this resistor on a k5000m, and switching it to the Hynix value from Samsung had no effect for him. He found that for Hynix on the k5000m the value was 35k Ohms, and for Samsung 45k Ohms. I searched the ENTIRE card and never found a single 35k Ohm resistor. Meanwhile the 970 also worked with all 8 chips swapped, at a paltry 2.1 GHz.

     

    Then I got lucky. Someone with a Clevo 980m killed his card when trying to change resistor values to raise his memory voltage. His card had Samsung memory. He sent his card to me to fix, and after doing so I spent hours comparing every single resistor on our boards looking for a variation. Outside of VRM resistors there was just a single difference:

     

    AIU6Ph3.jpg

     

    On his card (his is shown here) the boxed resistor was 20k Ohms. On mine it was 15k Ohms. I scraped my resistor with a straight edge razor (I could not find a single unused 20k resistor on any of my dead boards) raising it to 19.2k, hoping it was close enough.

     

    And it was! Prior to this I also raised the memory voltage a little more from 1.48V to 1.53V. My max stable clocks prior to the ID resistor change were 6552 MHz. They are now 6930 MHz. 378 Mhz improvement.

     

    Here's a 3dm11 run at 7.5 GHz (not stable, but still ran)
    http://www.3dmark.com/3dm11/10673982

     

    Now what about the poor 2GHz 970? I found its memory ID resistor too:

    6q6iGuQ.jpg

     

    Memory improved from 2.1 GHz to 6.264 GHz. Surprisingly the memory was slower than it was on the 980m. I expected the 970's vBIOS to have looser timings built in to run the memory faster. As for why the memory was over 100MHz slower than the 980m, 980m actually has better memory cooling than the 970. With the core at 61C I read the 970's backside memory at 86C with an IR thermometer. The Meanwhile the 980m has active cooling on all memory chips, so they will be cooler than the core. In addition, the 980m's memory traces are slightly shorter, which may also help.

     

    The 980m at 6.93 GHz is still slower than the 8 GHz that the 970 was capable of with the same memory. I'm not sure why this is. Maybe memory timings are still an issue. Maybe since MSI never released a Hynix version of the 970 meant leftover timings for an older card like a 680 were run, instead of looser timings that should have been used (I know in system BIOS tons of old, unused code get pushed on generation after generation). I don't know, just guessing. Talking to someone who knows how this stuff works would be great. I still want 8 GHz.

     

    Some more pics. Here's one with the 970 about to get its 3rd and 4th Hynix chips:
    Xuu0dxa.jpg

     

    Here's my 980m with all memory switched to Samsung. Sorry for the blurriness:
    7B8bHQm.jpg

     

    So in summary:

     

    1. It is possible to mix Samsung and Hynix memory, or switch entirely from one manufacturer to another, with some limitations.

     

    2. There is a resistor on the pcb that is responsible for telling the GPU what memory manufacturer is connected to it. This affects memory timings, and maybe termination. It has a large impact on memory speed, especially for Hynix memory. This resistor value can be changed to another manufacturer. It is not guaranteed that the vBIOS will contain the other manufacturer's timings. If it does they may not be 100% correct for your replacement memory.

     

    3. If you take a card meant for Hynix memory, you can mix Samsung memory of the same size if it is a faster memory. If the memory is the same speed, the penalty for running Samsung with Hynix timings may hurt memory clocks.

     

    4. If you take a card meant for Samsung memory, you cannot mix any Hynix memory without MAJOR clock speed reductions without also changing the memory manufacturer resistor. It is not guaranteed that the vBIOS will contain the other manufacturer's timings, or if it does 100% proper timings for your specific memory.

     

    5. For Kepler cards the Samsung resistor value is 45k, and for Hynix 35k. For Maxwell cards the Samsung resistor value is 20k, and Hynix 15k.

     

    Next up is changing the hardware ID to be a 980 notebook. Clyde  also found HWID to have an impact on the number of CUDA core blocks enabled. In about a month I can get a hold of a 970m that someone is willing to let me measure the resistor values on. It has the same pcb as the 980m. Does Nvidia still laser cut the GPU core package? We will find out.

     

     

    Full thread can be found here: https://www.techinferno.com/index.php?/forums/topic/9021-hardware-mod-gtx980m-hynix-to-samsung-memory-swap/#comment-134361

     


      Report Article
    Sign in to follow this  


    User Feedback


    There are no comments to display.



    Create an account or sign in to comment

    You need to be a member in order to leave a comment

    Create an account

    Sign up for a new account in our community. It's easy!

    Register a new account

    Sign in

    Already have an account? Sign in here.

    Sign In Now


  • Similar Content

    • By b-tzu
      Hello
       
      My M18XR2 was working on Windows 10 with a 880M.
      Last week, I reinstalled my system, and I couldn't get nvidia driver working...
      I took the last installed modified driver, and even downloaded latest version, modified it again, nothing to do, I have same error : nvidia installation failed. 
      I only install the graphic driver too, it fail. The screen goes black, then light again, and it fail...
      Do someone have an idea how to fix this probleme ? 
      Thank you 
    • By szumial
      Hello!
       
      I have joined the forums some time ago to learn about modding drivers for laptops and thanks to the community here I was able to upgrade my Dell M6700 with a GTX880m. This time I am stuck on a couple of GPU issues that seem to be corresponding to each other. Let me go through these things below.
       
      I have upgraded the M6700 with a GTX970m - OS is working fine, all everyday tasks going great and by replacing the 880m with a newer card I gained some power and lowered the temperature of the system. In order to install drivers for this 970m (the other card too) I had to modify "nvdmi.inf" file and trick the driver installator to think, that my laptop was an Alienware. I have figured that out by trial and error. However, strange issues happen since the new card arrived:
      - first of all, no matter which new driver is getting installed, after OS restart and some time, the screen flashes and comes back on - when going to NVIDIA Control Panel it shows that the driver installed is v.353.54 - it just changes the driver version as if it was stored somewhere in the OS. Of course each time I am performing a clean install with DDU
      - secondly, from time to time when powered on, all I can see is a blurred image of the Windows' welcome screen, as if the resolution was changed to a super-low setting - a reset helps with that
      - finally, the outcome of all this is that I can't run any game on the laptop for longer than 10-15 minutes. I have recently purchased Divinity 2 and it runs on its "ultra" settings, but the laptop just dies after a quarter and powers itself off, followed by a screen flash
       
      Now I know that these might be various things in my system, but I have a feeling that it is GPU related and there might be something wrong with the drivers as previously (on the 880m) I was able to run games for as long as desired. And yes, I have already tried monitoring the temperatures, lowering in-game settings and even underclocking my CPU (i7 3940XM) - the CPU gets a bit hot if you ask me - up to around 90 degrees, but other than that, all seems fine.
       
      Help!
    • By 71hourahmed
      I'm looking at finally upgrading my m17x from its old 7970m to a 980m, but the person I contacted to buy the card from warned me that the 980m requires a 200W power supply, and win10 (I'm still on 7, but I can upgrade easily enough, so that shouldn't be too much of a problem).
       
      I have read that the 7970m only required 100W, so I have no idea if my laptop would even be able to power the 980m or whether this would just be a waste of several hundred pounds. Can anyone clarify?
       
      Also, I have read on here that installing a new card in an m17x require you to manually update the video drivers, but I'm afraid that I'm not quite sure what that means, exactly - would I need to rely on kindly users on here to keep uploading new modded versions of the video drivers in perpetuity, or is it just that I need to somehow tweak the installation on new drivers in future?
    • By Polip
      Hello I'm lookig for 870m performance vBIOS, any possibilities for help ?
    • By Rappid Rabbit
      i was wanting to upgrade my clevo p151sm1(not -a) that has a gtx 765m to a 970m or 965m and wondering if its possible to do before i go buying the gpu and have it not work (cpu is i5 4300m)
×

Important Information

By using this site, you agree to our Terms of Use.