Is anyone using this ( 8k, 55 inch) as a computer monitor with an 8k video card?

Yes. Works great. You need a complete HDMI 2.1 chain to do it. That starts with a GPU with a HDMI 2.1 port which can only be found on NVidia RTX 30-series and AMD Big Navi GPU's. GPU's with DP 1.4 can do 8K but the Q900 does not have a DP port to connect to, and don't bother trying to do a DP to HDMI adapter. I've found only one company has attempted to build a product that tried to go from DP 1.4 to HDMI 2.1 and they've mysteriously discontinued doing so. Next you'll need an HDMI cable rated at 48gbps, most HDMI cables are rated at 18gbps or lower. Keep it less than 6ft for maximum chance of stability. Plug it into port #4 on the One Connect box. It's the only one that can drive 8K. Go into the TV settings and enable HDMI Plus. Windows added support for HDR in 2017 Fall Creators Update, but it was buggy. Windows 10 seems to have ironed out the bugs. So as long as you have a Windows 10 you are fine. Next, download the Content Ready driver from Nvidia, not the Game Ready driver which is optimized for gaming. You need this to enable 10bits, billions of colors which is needed for HDR. Usually, this is reserved for Nvidia's Quadro series pro GPU's but Nvidia was kind enough to enable this with their high end RTX cards. Without this, you can still enable 8K but you just need to do it manually by going into the Nvidia control panel, setting up a custom resolution, and manually typing out an 8K profile. If you have everything as mentioned above though, the option for 8K should pop up as a native resolution in control panel. Go to Youtube and find an HDR video. You should now have twice as many resolution selections to view from, half in regular view (ie 480p, 720p, 1080p, etc, etc) and just as much but in HDR view (ie 480pHDR, 720pHDR, 1080pHDR, etc, etc). You should be all set at this point. You'll be able to do 8K@60hz or 4k@120hz. I like it at 4K as it already provides lots of real estate to work in while giving head room to let the GPU stretch it's legs when doing heavy crunching. I do film content creation so I usually have multiple creative apps open at same time and can easily be using 12-20GB of video ram just for my GUI alone to do smooth playback and scrubbing. So the 24GB in an RTX 3090 is a requirement if doing creative work. I've yet to max out 48GB of system ram and topped off about 20GB of GPU ram.

My uhdtv 8 series 75" 2019 keeps turning off and on.

Same thing happened with mine. The tv was scrapped. The main board was toast. If the main board or sound board go, you can NOT replace either. You must replace both boards and the monitor (screen) because they all have to be synced together. This was directly from Samsung. My tv that 13 months ended up in the trash. Luckily I purchased an extended warranty and I got a new 1.

does this tv come with apps built in, Netflix, Utube,ect. ?

Unfortunately, yes! The only TV manufacturer currently to allow you to install any apps via Google Play Store (like normal) is Sony. Do not learn this the hard way, this is a great disadvantage. On the other hand, Sony doesn't have HDMI 2.1! There are NO TVs with the specs and software necessary for ALL of today's top content in the US at least...I'm waiting.

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Specifications

ASIN	B07N27SK3G
Additional Features	Browser
Analog Audio Output Count	1
Antenna Location	Entertainment
Aspect Ratio	1.77:1
Audio Input	HDMI, USB
Audio Output Mode	Digital
Best Sellers Rank	#606,749 in Electronics ( See Top 100 in Electronics ) #630 in QLED TVs
Bluetooth Version	5.0
Brand	Samsung
Built-In Media	Power Cable, Remote Control, Samsung Smart Control
Color	Black
Connectivity Technology	Bluetooth
Connector Type	HDMI
Content Sharing Direction	TV to Mobile
Contrast Ratio	QLED 8K
Control Method	Voice
Controller Type	amazon_alexa, vera
Customer Reviews	3.9 out of 5 stars 306 Reviews
Display Backlight Configuration	Direct LED
Display Backlight Technology	LED
Display Language Options	English (US)
Display Size Class	75 Inches
Display Technology	QLED
Global Trade Identification Number	00887276320212
HDR Format Supported	HDR10
Hardware Interface	HDMI
Has Color Screen	Yes
Integrated Surround Sound Format	Dolby Digital
Internet Applications	Amazon Instant Video, Browser, Hulu, Netflix, YouTube
Is Electric	No
Item Dimensions D x W x H	13.3"D x 66"W x 40.4"H
Item Height	40.4 inches
Item Type Name	Television
Item Weight	89.7 Pounds
Line Voltage	110 VAC 60 Hz
Manufacturer	Samsung
Model Name	SAMQN75Q900RBOB
Model Number	QN75Q900RBFXZA
Model Series	QN75Q900RBFXZA
Model Year	2019
Motion Enhancement Technology	High refresh rate (240 Hz)
Mounting Type	Table Mount, Wall Mount
Number of Audio Channels	4.2CH
Number of Component Inputs	4
Number of Component Outputs	4
Operating System	FireOS
Parental Control Technology	V-Chip
Picture Quality Enhancement Technology	Quantum Processor 8K, Quantum HDR 24X, 8K AI upscaling, Direct Full Array 16X
Power Consumption	275 Watts
Refresh Rate	240 Hz
Resolution	8K
Screen Finish	Flat
Screen Size	75 Inches
Signal Format	HDMI, USB, ATSC
Speaker Description	4 speakers and 2 subwoofers
Special Feature	Browser
Total Number of HDMI Ports	4
Total USB 2.0 Ports	3
Total USB 3.0 Ports	3
Total Usb Ports	3
Tuner Type	Analog Tuner
UPC	887276320212
VESA Mount Standard	600 x 400 mm
Video Encoding	HEVC
Voltage	120 Volts (AC)
Warranty Description	1 year manufacturer
Warranty Type	Limited
Water Resistance Level	Not Water Resistant
Wattage	275 watts
Wireless Technology	Wi-Fi

SAMSUNG QN75Q900RBFXZA Flat 75-Inch QLED 8K Q900 Series Ultra HD Smart TV with HDR and Alexa Compatibility (2019 Model)

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