are the Vega 64 air cooled or Water cooled?
According to this website : PSU REQUIREMENTS - RealHardTechX
Two Air-cooled Vega 64 requires a minimum PSU of 1100 watts
Two Water-cooled Vega 64 requires a minimum PSU of 1500 watts
So with one Vega 64 GPU card installed, the computer works normally but with two it becomes extremely sluggish. What does Task Manager - Performance Tab show for CPU, GPU & Memory usage with one and with two vegas installed?
Do you have any hardware monitoring software installed like HWmonitor that will indicate PSU voltages and Temperatures of CPU and GPU?
They are air-cooled.
PSU is 1500w
Task manager doesn't show anything really (when you can get it open) .I wasn't kidding about it being unusably slow. It's impossible to use when the mouse moves speraticly a few pixels a minute.
Thank you. However I don't think this is the same issue. For one it only occurs with dual GPU and its not just the mouse. The whole interface slows down. You can see this especially when it's booting. It's not just a laggy mouse. It's more like it's almost frozen.
Okay, I was just trying to direct you on what you posted. I really not that familiar with Vega 64.
Trying contacting AMD Support by opening an AMD EMAIL SUPPORT Ticket from here: Email Form
This way you will get an answer from AMD Support directly. Maybe they can direct you on how to resolve your problem.
Do you believe it might have something to do with RAID being used?
Are you, by any chance, seeing very high temperatures with dual GPU installed?
Thanks. I'll try the support email. Temps on the cards stay reletivly low (50-70)
It feels like it's related to the raid. Like there arn't enough "slots" for something. There should be plenty of pcie lanes 3*4 for the M.2 drives and 16*2 for the GPUs = 44 lanes.
I not sure, this may be helpful in how your PCIe lanes are configured on your motherboard through BIOS according to your Motherboard Manual: https://dlcdnets.asus.com/pub/ASUS/mb/socketTR4/ROG_ZENITH_EXTREME/E13369_ROG_ZENITH_EXTREME_UM_V2_WEB.pdf?_ga=2.1441715…
Found this thread at Superusers concerning about M.2 PCIe SSDs and how it affects PCIe lanes: Does M.2 SSD Card mess with PCI express? - Super User
It is possible, guessing here, that the two Vegas are not getting enough bandwidth when installed in a RAID Configuration. Best to ask AMD Support unless someone else here at AMD Forum can explain.
Download and run GPU-Z. That will tell you what PCIe speed both cards are running when installed.
Click on the Blue Question mark next the PCIe Bus Interface and click on Render. This will show the proper speed that is running at it highest performance.
When I used the Render Test, the PCIe Bus Interface went from 1.1 to 2.0