I reviewed your post and I understand that the games lag when you connect the VR headset.
Don’t worry, I assure you I will try my best to get this sorted.
Based on your description it looks like the memory is getting utilized completely and that could be causing the issue. However, I recommend you update the BIOS and the graphics driver from the below link and check if it helps.
The VR is still having the same issues despite increasing memory. I'm now thinking I will need to upgrade the graphics card but am unsure if the one I am looking at will fit into the pc my son has. I'm looking at the GTX 1080 ti, would you know before i purchase it if it serious fit into the slot and casing and also will that mean i also need to upgrade the power supply? I honestly didn't imagine 12 months ago when I purchased it that it would need all this upgrade so soon, or should it run the valve index fine?
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