Can't upgrade my gpu for some reason?

Naiphe

Bronze Level Poster
Hi so i'd like to upgrade my gpu. My pc is a pc specialist pc that I bought back in 2015. Specs:

CaseCORSAIR CARBIDE SERIES™ AIR 540 GAMING CASE
Processor (CPU)Intel® Core™i7 Quad Core Processor i7-6700k (4.0GHz) 8MB Cache (overclocked @4.6 ghz)
MotherboardChange to: Gigabyte Z170-HD3P: ATX, LG1151, USB 3.1, SATA 6GBs
Memory (RAM)16GB HyperX FURY DDR4 2133MHz (2 x 8GB) (overclocked @ 2666mhz)
Graphics Card4gb amd radeon RX 580
2nd Graphics CardNONE
3rd Graphics CardNONE
1st Storage Drive250GB Samsung 850 EVO SSD, SATA 6Gb/s (upto 540MB/sR | 520MB/sW)
2nd Storage Drive1TB WD BLACK WD1003FZEX, SATA 6 Gb/s, 64MB CACHE (7200rpm)
1st M.2 SSD Drivewd blue 500gb m.2
1st PCI-E SSD DriveNONE
2nd PCI-E SSD DriveNONE
RAIDNONE
DVD/BLU-RAY Drive24x DUAL LAYER DVD WRITER ±R/±RW/RAM
2nd DVD/BLU-RAY DriveNONE
External Hard DriveNONE
Memory Card ReaderNONE
Power SupplyCORSAIR 650W CS SERIES™ MODULAR 80 PLUS® GOLD, ULTRA QUIET
Power Cable1 x 1 Metre UK Power Cable (Kettle Lead)
Processor CoolingCoolerMaster Hyper 212 EVO (120mm) Fan CPU Cooler
Thermal PasteARCTIC MX-4 EXTREME THERMAL CONDUCTIVITY COMPOUND
LED LightingNONE
Fan ControllerNONE
Extra Case FansNONE
Sound CardONBOARD 6 CHANNEL (5.1) HIGH DEF AUDIO (AS STANDARD)
Wireless Network Card10/100/1000 GIGABIT LAN PORT (Wi-Fi NOT INCLUDED)
Wireless Router/HomePlugsNONE
USB/Thunderbolt OptionsMIN. 2 x USB 3.0 & 4 x USB 2.0 PORTS @ BACK PANEL + MIN. 2 FRONT PORTS
Capture/Streaming CardsNONE
FirewireNONE
TV CardNONE
Operating SystemGenuine Windows 10 Home 64 Bit - inc DVD & Licence
Windows 10 UpgradeFREE Upgrade to Windows 10 with all Windows 7 & Windows 8.1 Purchases*
Windows Recovery MediaWindows 10 (64-bit) DVD with paper sleeve
Office SoftwareNO OFFICE SOFTWARE
Anti-VirusNO ANTI-VIRUS SOFTWARE
BrowserFirefox™
MonitorNONE
2nd MonitorNONE
Monitor CablesNONE
Eyefinity AdapterNONE
Keyboard & MouseNONE
MouseNONE
HeadsetsNONE
Mouse PadNONE
Games ControllerNONE
SpeakersNONE
WebcamNONE
Surge ProtectionNONE
Cable ManagementNONE
PrinterNONE
Warranty3 Year Silver Warranty (1 Year Collect & Return, 1 Year Parts, 3 Year Labour)
Home InstallationNONE
DeliverySTANDARD INSURED DELIVERY TO UK MAINLAND (MON-FRI)
Build TimeStandard Build - Approximately 6 to 8 working days
Promotional ItemFREE METAL GEAR SOLID game with select GTX 9 Series GPUs! -Subject to T&Cs

I'd like to upgrade to a radeon rx 6800xt. I understand that it will be on back order and I'd have to wait however I dont have any options to upgrade when I try to do so. This is all I get?:

1615119208535.png


Why dont I have any options to upgrade? Am I missing something really obvious here?
 
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