nope.
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The problem is with my GPU, not with my "old PC".
no it's not, emulation is primarily cpu dependent. gpu is in addition to the cpu. You're clearly one of these people who think a 10 year old 3ghz cpu is the same as a new 3ghz cpu - it's not and never will be.
Whatever your issues are with upgrading it's something you will have to do, fairly modern parts can be had for next to nothing if you don't mind getting a generation or two old.