Can alienware x51 r3 support 32 GB RAM and gtx 1080 6gb video memory without any problems? Can the PowerSpeed be upgraded to more than 330 watts?
It does support 32 GB of memory:
Minimum: 4GB, Maximum: 32 GB
It does not support the GTX 1080 (it will not fit) and the Power Speed can not be updated.
Dell | Alienware Technical Support
Opening your case does not void your warranty! Check out Alienware Artificial Intelligence
I can't always reply to PM's, if you need extra assistance visit:
Yes - as noted 32Gb is fine.
Yes - an Alienware Graphics Amplifier can be connected and a 1080 or indeed a 1080ti can be installed and used (note the AGA wants a pretty stock standard (FE) style card to make it fit properly thicker cards with complex fan options will be a challenge.
The AGA has a separate power supply, so not limited by the R3 power supply. It has 2 x 8 or 2 x 6 pin connectors.