Can't increase UMA buffer size past 2 Gb with GPU

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   As I have hinted at in previous posts, I had a problem recently when I upgraded my computer:

Motherboard:  B450 Pro4, bios version 3.50.
CPU:  Ryzen 2200G
Memory:  2 x 8 GB G. Skill Flare X 3200 CL14
GPU (new to system):  Asus ROG Strix 1660 Ti O6G-Gaming

The system was working just fine before I installed the GPU.  I had recently increase the dedicated APU memory up to 3 GB as per the FAQ (integrated graphics controller set to Forces, UMA mode to "UMA_Specified", UMA Version to "Auto", and UMA Frame Buffer Size to "3G").  I also had the UMA frame buffer size set to "auto" under the Advanced\Onboard Devices Configuration.  However, once I installed the 1660 Ti, I could not get the computer to post.  I thought I may have installed the card wrong or something.  I move the GPU to the other slot, swapped memory around, nothing worked.  I then cleared the CMOS, and I got it to post.  When I got both the 1660 Ti and the 2200G graphics working together (I crunch with both GPUs using BOINC), I set the dedicated video memory in bios back to 2G.  Fast forward to today, I set the memory up to 3G, and the same problem happened, I couldn't post and had to clear the CMOS to get everything working again.

I have a feeling this is a bug and not a feature.  Does anyone have an idea of what is wrong?  I don't see why I can't use more memory for the 2200G than the default 2 Gb whether I have a discrete GPU or not.  I also don't understand why the UMA frame buffer size is located in two spots of the bios (and one of them is limited only up to 2G).  I was planning on contacting tech support, but I thought I'd see if anyone here has a thought of what might be wrong.

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Vulpie05 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 26 Dec 2018 Status: Offline Points: 64	Post Options Post Reply Quote Vulpie05 Report Post Thanks(0) Quote Reply Topic: Can't increase UMA buffer size past 2 Gb with GPU Posted: 27 Sep 2019 at 10:07am
	As I have hinted at in previous posts, I had a problem recently when I upgraded my computer: Motherboard: B450 Pro4, bios version 3.50. CPU: Ryzen 2200G Memory: 2 x 8 GB G. Skill Flare X 3200 CL14 GPU (new to system): Asus ROG Strix 1660 Ti O6G-Gaming The system was working just fine before I installed the GPU. I had recently increase the dedicated APU memory up to 3 GB as per the FAQ (integrated graphics controller set to Forces, UMA mode to "UMA_Specified", UMA Version to "Auto", and UMA Frame Buffer Size to "3G"). I also had the UMA frame buffer size set to "auto" under the Advanced\Onboard Devices Configuration. However, once I installed the 1660 Ti, I could not get the computer to post. I thought I may have installed the card wrong or something. I move the GPU to the other slot, swapped memory around, nothing worked. I then cleared the CMOS, and I got it to post. When I got both the 1660 Ti and the 2200G graphics working together (I crunch with both GPUs using BOINC), I set the dedicated video memory in bios back to 2G. Fast forward to today, I set the memory up to 3G, and the same problem happened, I couldn't post and had to clear the CMOS to get everything working again. I have a feeling this is a bug and not a feature. Does anyone have an idea of what is wrong? I don't see why I can't use more memory for the 2200G than the default 2 Gb whether I have a discrete GPU or not. I also don't understand why the UMA frame buffer size is located in two spots of the bios (and one of them is limited only up to 2G). I was planning on contacting tech support, but I thought I'd see if anyone here has a thought of what might be wrong.