Hi Vini, I have exactly the same issue, i made a research on internet and this is a common thing with this model, i tried re installling the dell original drivers, with no success, i also updated the machine in all areas, bios, drivers, windows, etc.

After some test i found out that if you use the cooling profile in alienware command center, it limits the cpu wattage and the frecuency, that helps to continue using the gpu without fps drops and no wattage drop.

It's a shame because you have an alienware machine for it's performance right?, i dont know why this is happening.

1. It's worth to mention, when i have this manchine in their first month, all the thermals were amazing, no passing the 90 celsius, and with a good cpu frecuency, after one update using the alienware update software, the performance was increase but with thermals around 100 mostly of the time.
2. One major thing to notice, i have this problem (GPU losing fps and wattage) on this month april, on winter, was performing normal, not great but normal.

Let us know what happened with dell support.

Updated version, even with the cooling profile can have fps drops, it´s only extend the time to get there!!!

Hope dell can help us!!!

Hi @Vini_Colen and @Renton08 welcome to this free user to user Alienware laptop discussion forum. This is not Dell Support. 

Thanks for sharing Alienware m15 R6 GPU problem. Seemingly the GPU has a fault. Please click on @DELL-Cares and send Private Message to request assistance. 

Please log into your online Dell account and raise Service Request, so that Dell knows there is a problem to fix. 

Accept Dell Technical Support request to enable live log-on session, so that Dell can deploy their troubleshooting applications. If hardware problem, they will instigate repair. If within first 30 days, you have the option to Reject and get new replacement or full refund. Dell Refund policy, New vs Refurbished - Dell Community 

Hi @Renton08  the new replacement or refund option is valid during the first 30 days (see invoice for details). Thereafter the Dell warranty provides refurbished hardware, no refund. If battery fails within first year, Dell installs a new replacement battery. 

@crimsomthanks for your answer, i have already send a message to @DELL-Cares for the info, in my case i have this computer from Oct last year, and the performance were great until a couple of months, the refund policy and the replacement applies?

As like as you my friend i have this problem,my laptop has rtx 3070 ti with 150w but adaptor is 240w and for settings of laptop is bad ,in other side the rivals brand like Legion - Asus rog , they have 280w power adaptor and for now i don't know how fix this problem.

Hi , I have same problem to, in my cpu performance at least 18% my laptop dropped  then in my gpu at least 60% dropped , please tell what is problem??