Intro
I’m trying to gather info on working extension cable solutions for the Pimax 8KX (this is primarily for the X but should also work for the other headsets though going fiber optic on short runs (5m) isn’t necessary for the 5K+/8K/Artisan).
In general, the DisplayPort cables have to support the following standards/specs to work on the 8KX:
- DP 1.4
- 8K60Hz
- DSC
- HBR3
- 32.4 Gbps
Some have had luck with Club3D 2 or even 3 meter extension cables but it seems not all GPU’s provide sufficient signal strength. You have been warned… 
USB cables have to be USB 3.0 for the blue/thick cable and if You want more than 3m extension it should be a powered cable (or a “repeater” cable).
For the black/thin cable any USB 2.0 cable would probably suffice as it’s only used for (extra) power.
You could also just plug the USB 2 cable into a power brick nearer Your play space if possible (and extend from the wall outlet instead if needed).
Fiber Optic/Active DisplayPort Cables (male/male)
Using a fiber optic cable prevents signal degradation and noise as it transmits using light instead of electrical signals. The downsides are that they are prone to breaking (don’t bend them too much) and they are expensive.
Tested working
UGREEN Displayport 1.4 Cable, Fiber Optic DP to DP Cable 10m, purchased February 2019 on Amazon UK (no longer available it seems) - coupled with “Cable Matters” passive couplers linked below by - Tested by @Plews in this thread.
Working coupled with “Lindy 38415 DP Repeater” linked below - Tested by @twack3r
Will be tested by @DrWilken coupled with Cable Matters Repeater linked below.
UPDATE: Did NOT work with the Cable Matters repeater for the 8KX but worked fine for the 5K+ so probably a bandwidth or feature issue with the repeater.
UPDATE2: Works with the “Lindy 38415 DP Repeater”…
Passive DisplayPort Couplers (female/female)
Can likely be used with fiber optic cables as there’s no need for amplification. Most likely won’t work on passive cables.
https://www.amazon.com/gp/product/B00YFPM2CU
Tested by @Plews with the UGREEN fiber optic cable which is no longer available but will most likely work with any fiber optic cable.
Active DisplayPort Couplers/Repeaters (female/female)
Amplifies or restores the signal strength. Should work with fiber optic cables but might be unnecessary/overkill.
Tested working
Tested by @twack3r with CableDeconn Fiber Optic cable and by @DrWilken with the YIWENTEC Fiber Optic cable both linked above.
Not working
Will be tested by @DrWilken with the “YIWENTEC Fiber Optic” cable linked above.
UPDATE: Did not work with the YIWENTEC cable for the 8KX but works fine with a 5K+. Not recommended for the 8KX.
Passive DisplayPort extension cables (male/female)
These may or may not work for You as they’re passive cables and You’re at the limit of the DP specs.
2m extension (bigger chances of it working than 3m):
3m extension (less chance of it working due to signal degradation/noise):
https://www.amazon.com/Club-3D-DisplayPort-Extension-bi-Directional/dp/B081D38N65
Passive DisplayPort Cables (male/male)
I only tested a few passive cables with the Lindy 38415 Repeater and 5 meter passive cables didn't work but if 3m is enough for You I would think any good quality DisplayPort cable at 3m length would work as long as it's coupled with the repeater.The following cable has been verified working:
USB
Basically, any good quality USB 3.0 extension cable should work for the USB3 (blue) port (if it’s more than 3 meters go with an active one - i.e. a repeater cable).
For the USB 2.0 port You can easily use 5m passive cables, but if You’re extending more than that go with an active/repeater (USB 2.0/3.0) cable instead or using an extension cord from Your wall socket and a generic USB charger/brick.
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