HP M6-1125dx Graphics Card Compatibility PLEASE RESPOND ASAP

I'm planning to buy a HP M6-1125dx from Best Buy for $500. The laptop runs a Intel 4000 HD Graphics Card. This thing is pretty weak, and I wanted to upgrade to a new graphics card. I just don't know which graphics card will fit. I know my stuff when it comes to desktops, but am pretty new to the laptop world. I'm not exactly sure how I can tell if a graphics card will be compatible with my laptop. I just want a graphics card that runs at 1gb of ram on it. I don't care if it's AMD or Nvidia, I just need a list of compatible graphics card, or a list of graphics cards that aren't compatible. Also if you do answer can you please tell me how you can tell if something will fit with your laptop or not, because I don't want to beg for help the next time I'm upgrading my laptop or advising people about theirs. Thank you guys, I'm new and from the looks of the Forum it seems like you guys and gals won't let me down. So thanks!

Oh yeah here's a link to EXACTLY what I'm going to buy: HP ENVY 15.6" Laptop 8GB Memory 750GB Hard Drive m6-1125dx - Best Buy

 

The answer to that one is simple: you can't upgrade the graphics card. A laptop is far from a desktop, very few of them have a GPU that is upgradeable. Among those have upgradeable GPUs, you have some models (only some) from Clevo, Dell, Alienware, MSI and the odd one here and there.

 

Only HP workstations like the Elitebook 8760W feature MXM cards, no consumer HP has MXM cards anymore.

 

I would rather spend $100 plus at BestBuy for the m6-1105dx, than you have a decent Radeon 7660G graphics, maybe future comparability with Trinity 2.0 which again has stronger graphics .

 

I would say what games you are planning to spend, 500 won't really buy much, and will only buy you a low end Trinity laptop or a medium range Llano laptop. I bought a partially barebones W860CU with a 720QM and 280M for under 500, added some parts and it destroys Trinity laptop in benchmarks.