Wireless speed and GigaPower

If by "ATT gigapower box" you mean the ONT power supply (a white box that has a white power cable plugged into power, and a grey cable going outside) then having that in the garage does not effect speed. It's just taking power and shooting it outside to the ONT. That's the 240 ONT. We're supposed to put the PSU inside to protect it from the elements, so putting a plug outside wouldn't really help. 

The 010 ONT is a little white box that has a black power cable and Cat5e coming out of the bottom. 

You have one or the other. We will normally use the 240 ONT when there is already Cat5 outside of the house going into a smart panel, etc. 

I figured if this signal takes advantage of the cooper wiring in the house, this is not an optimal setup.

The only copper in the signal flow is Cat5e from the ONT to the modem. It can handle the speed. If the house, etc does not have Cat5e or better the tech runs a new line. 

I'm a bit confused about your speed question. As the title of the thread is talking about wireless, but in the post your talking about hardwired. 

There are many variables that limit speed both wired and wireless.

Wired:

• PC limitations (old hardware, 100mbps network card, 2 pair Ethernet patch cable, etc)
• Software (antivirus, VPN, etc)

Wireless:

• Protocol (2.4GHz vs 5GHz, device not having AC wifi, etc)
• Distance from modem
• Interference (modem next to other wireless emitting devices, walls, metal, etc) 

My work provided iPhone 6s gets around 200-300mbps over 5GHz AC wifi near the modem.

I have attached a picture of what is on my wall inside my garage. I am not a technical expert ( obviously) but would like to get at least 50% speed that I pay for. Both grey and black go to the outside, it is plugged into 4 extensions to get power from the other side of my garage.. Inside the house I have a new connection box ( PIC ATTACHED)that goes to the 5268AC, I supplied a Cat 6 on that connection and a cat 6 from the 5268AC to the VEN501-AT. My home phone is also connected to the 5268AC and another small box (pic attached) I have Direct TV so there is a wire that runs through the garage wall to that same location in the office through the wall to the livingroom TV setup.

As far as hard wired or wireless,and my equipment I have a new xbox slim hard wired and it get 275mbps down, 270 ish mbps up.. Brand New X box X , wireless about the same speed. Nothing else accessing the internet.

So slow speed is not my equipment.

So with all the pictures attached maybe you can “see” something that does not look right.

Thank you for the help.new boxfiber optics-garagephone connections

That's the 010 ONT.

The installer ran Cat5e from the ONT to the RG. So there is no bottleneck in the copper. 

I have a new xbox slim hard wired and it get 275mbps down, 270 ish mbps up.. Brand New X box X , wireless about the same speed. Nothing else accessing the internet.

So slow speed is not my equipment.

My guess, it doesn't support 1gbps. Why should it? When you connect to a game, it doesn't need it to connect to a server and play, when you download a game OTA from the Xbox store, their servers are not dishing out data at 1gbps. You're getting the same wired/wireless because 5GHz AC wifi is super fast. This sounds like that is just what the Xbox is capable of. 

Not all devices are built to be able to handle or use 1gbps, even brand new devices. 

Just for the record we tested the speed on the xbox (microsoft) browser at speedtest.com.

Guess this conversation is going nowhere.

x box x specs

I see where it says that it has a 1gbps LAN chip. So yes, in theory it should support it.

Speedtest.net has a ton of servers, have you tried picking the closest ones? Or are you just letting it automatically pick?

In your OP:

I tested several times with nothing but the testing machine accessing the internet and plugged directly into the router.

Is this device you're referring to the Xbox, or a PC?

If you've only tested with one device, I'd recommend using a PC with an Ethernet port and trying with that.