Question 1

does ethernet cable stream video from computer to flat screen does audio work to?

Accepted Answer

No. Ethernet transmits internet data, and does not have the bandwidth necessary for video, much less video plus audio. DVI, an almost 20 year old standard, has a maximum bandwidth of around 5 gigabits per second, which is enough for 1080p60. This chord has a maximum bandwidth of 1 gigabit per second, meaning that it would barely be enough for 720p30 even if it could transfer video. One would need a VGA, DVI, HDMI, or DP cord to connect to your flat screen, depending on your PC and flat screen.

Funnily enough, HDMI 1.4 has the capability to do Ethernet functionality, but it needs to be supported on both devices.

Question 2

Is this an enhanced 550Mhz one? Would it work good throught walls?

Accepted Answer

I do not know if it is an enhanced cable. It should work through walls as long  as you are careful during installation. The signal transmission seems  to be pretty good

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