upgrading graphics card asus geforce gtx 860m 2gb

You can just upgrade to the 670MX (from the G75VX) as it's a simple drag and drop upgrade. More research and skill is required here. Plus, you will be spending more for a higher spec card and appropriate tipped AC adapter. Going this route is higher risk since you will be dependent solely on your own ability modding your system or trust in another doing it for you if you can't, with no real concrete guarantee for a successful outcome. A 180W brick will still work nonetheless. This method can be applied with various cards just take note on 100W+ cards requiring 230W AC adapters so you don't power throttle, sometimes overclocked or not. If you feel removing the heatpipes from the heatsink and soldering it onto the other is something you can't do successfully (definitely not recommended on your first time around unless you have a spare heatsink in case something goes wrong) you can pay for someone to do this for you, try phoning around PC repair shops, plumbing, etc. You still will have the 660M vBIOS in the system BIOS in case you need to do a fail safe and revert back to the 660M for system functionality should something happen. You will also need to modify your drivers.

You of course will require a modified BIOS that has the 860M vBIOS inserted in the system BIOS of the G75VW flashed before installing the 860M.

If length is a problem then you'll want to do the same thing for the 860M heatsink (oven method or even a heatgun) and then solder it in place further up the heatsink, take extra care as to not kink the pipes during fitting or you risk its effectiveness if any splits should occur, rendering it useless. Another method is to simply adjust the 860M existing heatpipes enough to fit properly in the G75 chassis. If resistance is felt, leave it in longer until you can freely remove them. When at the 5 minute mark, try applying some pressure to the pipes lifting them from off the heatsink itself. The heatpipes from your 660M can either be relocated to the heatsink of the 860M using the oven method (be careful not to leave it in too long - heatsink assembly only of course) which can be done by first removing the 660M heatpipes at 450☏ for about 8-10mins. First you will need to do some chassis modifications to your G75VW, either with a dremel or hot knife to make the G750 860M PCB fit properly and then secure it with one of any remaining aligned standoffs, if none are exposed, use double-sided sticky tape instead.

Upgrading graphics card asus geforce gtx 860m 2gb