Hi,
thanks to everyone who have contributed with their personal upgrade experiences. I newly signed up here just to share mine. Your posts encouraged me to try a small upgrade over the K1000M card that was in my 8570w laptop. I bought a M1000M off eBay, mainly because it wasn't too pricey (20 USD). Not a huge loss if it didn't work, right! The card was pulled from a Dell laptop with vbios version 82.07.8F.00.1A. After turning the computer on, all the pixels on the screen turned white before slowly fading. The display is the 1920x1080 one with the LVDS connector.
I managed to see if the DP output worked by using a Linux Mint LiveCD. I have Linux (Gentoo) installed on that machine, so I was able to get to the console on the external display. I then decided to download and try flashing vbios version 82.07.8D.00.15 (https://www.techpowerup.com/vgabios/239513/239513) onto the card with the linux version of nvflash... and it worked!!!
I am happy! Thanks everyone! 😁 Hope this helps others who want to try this little upgrade over the original card.