A:AnswerHello Todd,
These computers are all prebuilds with the specs as stated, so if you wanted a 850 watt power supply you would have to install it yourself.
Thank you.
A:AnswerHi Mick,
Unfortunately, we cannot specify the brand that is used in system as our brands vary dependent on what we have on hand. However the brands range from major gaming companies such as MSI, ASUS, etc. Thank you!