Ch. 7 of the book is specifically about the city of Erelhei-Cinlu in the Vault of the Drow. It is 22 pages, & includes a city map.
A fair amount of Greyhawk-specific information is found throughout the rest of the book (NPCs, adventure sites, information on House Eilservs, etc.)
Much of the rest of the book is campaign setting neutral, applying to drow in most campaign worlds.
If you're playing in the Vault of the Drow, this book is a must.
Two other required sources (besides D3):
there's a Dragon magazine from somewhere around issue #200 with a deep dive into the Vault; probably this was used as the basis for the DotU treatment
Joseph Bloch (aka Greyhawk Grognard) recently released a free module D4 involving intrigue in Erelhei-Cinlu, City of Spiders, I think it's called, and I strongly recommend it. It does all of the DM's work for properly motivating PCs through D3, so you should really just consider it an extension of that module. Lots to steal even if you're doing something different.
The only other significant source I recall is Dead Gods (from 2e days), but I don't remember it having tons of new info. Been a long time since I checked, however.
As this is 3.5e, all the content is nominally set in Greyhawk, although most of it is generic.
However, Drow of the Underdark has a pretty full write-up of Erelhei-Cinlu on pages 191-214. It builds on and expands the article found in Dragon #298. (A design credit for Frederick Weining would have been classier.)
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