mrmpman, I suspect you did not do a fresh install of Windows. Please do a fresh install and let us know if that helps. If not, then tell us much, much more about your build and we will try to help. Enjoy, John.
Everything on the computer is new, including the windows copy. Would you still suggest resetting windows?
mrmpman, if you modified nothing in UEFI or via Ryzen Master (RM), then this makes no sense. Please do as I asked and post all you system specifications. Until we know about your system, I can recommend nothing! Enjoy, John.
EDIT: Please run Ryzen Master (RM) and post a screenshot.
Processor: Ryzen 7 1800x
Motherboard: ASRock Fatal1ty x370 Gaming X
RAM: Single module of 8 gigs, Corsair Value Select
GPU: Currenly only 1050 TI
Operating system: Windows 10 Home
I have fiddled with nothing in the bios, however i have messed with Ryzen Master but only an overclock and as far as disabling cores that option has never been avaliable to me through the software. Its always been greyed and can't seem to change that.
Id much rather not wipe it it would take a very long time to reupdate windows and install games again and i would like to prevent that as much as possible. If no other suggestions can be thought of then i am willing to do so but preferably only as a last resort
mrmpman, where did you get your copy of W10 and is it 32 or 64 bit? It should be 64 Bit. If you go to the Windows Media Creation site and tell it to create a USB stick for installation, it will write the setup files on a 4 GB - 8GB USB stick. The W10 will be at the latest update. Boot this stick and install W10, be sure to select the Home version. If it ask for a key, tell it you do not have one (Check box on lower left). Please format your C: disk and do not worry about your applications until we sort this cores problem. You can run RM but do not change anything. Thanks and enjoy, John.
Sometime updating the BIOS to the latest versions may help in showing the correct amount of CPU Cores: ASRock > Fatal1ty X370 Gaming X
4.90 2018/8/29 8.16MB Instant Flash 1.Update PinnaclePI-AM4_22.214.171.124
2.Keep the XMP setting after system restoring from G3 state.
* If the current BIOS version is older than P3.50, please update BIOS to P3.50(Bridge BIOS) before updating this version.
Sometimes if you don't use compatible RAM MEMORY from the Motherboard's QVL list can also cause issues: ASRock > Fatal1ty X370 Gaming X .
Here is a list of all Corsair compatible RAM MEMORY for your Motherboard from Asrock QVL List:
DDR4 Corsair 3000 2933 8GB CMD32GX4M4B3000C15 (Hynix-M) SS 2 v DDR4 Corsair 2933 2933 8GB CMK16GX4M2Z2933C16 SS 2 DDR4 Corsair 2933 2933 8GB CMK32GX4M4Z2933C16 SS 2/4 DDR4 Corsair 2933 2933 8GB CMR32GX4M4Z2933C16 SS 2/4 DDR4 Corsair 2933 2933 8GB CMR16GX4M2Z2933C16 SS 2 DDR4 Corsair 2800 2800 8GB CMD32GX4M4A2800C16 DS 2 DDR4 Corsair 2800 2800 4GB CMK16GX4M4A2800C16 see 5.29 SS 2 DDR4 Corsair 2800 2800 4GB CMK16GX4M4A2800C16 see 4.23 SS 2 DDR4 Corsair 2666 2666 8GB CMK32GX4M4A2666C16 see 5.30 SS 2/4 DDR4 Corsair 2666 2666 8GB CMK32GX4M4A2666C16 DS 2/4 DDR4 Corsair 2666 2666 8GB CMD32GX4M4A2666C15 ver4.23 DS 2/4 DDR4 Corsair 2666 2666 4GB CMK16GX4M4A2666C16 SS 2/4 DDR4 Corsair 2666 2666 4GB CMD16GX4M4A2666C15 SS 2/4 DDR4 Corsair 2666 2666 4GB CMD16GX4M4A2666C16 SS 2 DDR4 Corsair 2400 2400 8GB CMK16GX4M2Z2400C16 see: 3.31 SS 2 DDR4 Corsair 2133 2133 8GB CMK16GX4M2A2666C16 see: 5.29 Hynix SS 2
Also you can always try to activate all the CPU Cores thru Windows as follow:
Press Windows Key + s from the keyboard->type msconfig->Click on Boot->Advanced Options->Check on Number of Processors->Now select the Processor that you want to activate->Click on Apply->OK.
Also check your BIOS and see if you can activate all CPU Cores.
Found this old AMD Forum Thread with the same exact problem with similar Motherboard and CPU: 1800x, Ryzen master showing 4 cores disabled and I cant enable them, is the software wrong?
Ryzen Master can also deactivate or activate your CPU Cores. If you have Ryzen Master installed set it to "Default" by "Reset" box and see if all your cores are showing activated.