This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
Yes. There is another weak link in the power delivery 'chain': the
motherboard circuit traces supplying power to Slot boards are fairly skimpy,
especially on ROM-01 boards. A heavy power user, such as a souped-up Transwarp
accelerator board, in Slot 7 can produce significant noise up and down the
entire Slot 'backplane'.
The cure is to remove the motherboard and tack on #18 - #16 gauge jumper
leads. (See Question 007 for details.)
By: Rubywand
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