Tforce Extreem 16GB 3600mhz kit

[Agrius14]

Looking for advice please. I have installed 2 new sticks, set XMP profile which shows 3600mhz 14-15-15-35 1.45V which is the stock setting of the ram. All other settings as auto, PBO is enabled.
In bios (Gigabyte x570i) it only shows as 2400mhz. On Hwinfo64 again showing at 1200 frequency and zen timings confirm 2400mhz. I've tried to manually change in bios but not working. I've checked compatibility on website and all good with mobo. CPU ryzen 5600x.
I had CB memory before and it was showing as XMP 3600 with bios at 3600mhz Hwinfo was 1800mhz. All settings were as above auto, PBO.
Could it be the Tforce is faulty, I've checked the code per stick and referenced on their website which matches my stick's speed and timings.
Any help /advice appreciated.

 

[Agrius14]

Thanks, it's really odd as I removed the Tforce sticks into my other pc they work great at all the timings clock speed. Fitted the old sticks back and they are acting the same running at jedec speed. I have been able to manually adjust upto 3400mhz, which is an improvement but unable to use xmp. I cant push to the base 3600mhz. I dont no what's happened to this pc as it was working with xmp at 3600mhz.

 

[Agrius14]

So I have completely stripped down my pc this weekend, reset cmos, installed a new bios update.
And!!! Exactly the same. Can only set manually 3400mhz at 3600 timings. Anything else i try just resets to 2600mhz.
My ram is qvl with mobo
Is this then a mobo problem?
Or cpu problem ?