Beetle PSX graphical glitch

When I use the default driver for this core, I get strange colored dots all over the screen. When I change the internal color depth to 32, it improves but still shows some dots. When I switch to the software driver the dots go away but of course the performance takes a big hit.

Is there a way to increase the color beyond 32 or has anyone else come across this problem?

Thanks.

does this happen with all games? can you post a screenshot?

This happens with all games. The top pic is the 32bbp and the bottom one is 16.

For additional info, this is using an i3-7100 with integrated graphics. Is there a log I could post that would help? Thanks.

So has no one else come across this problem before? Desperate to try and fix this lol.