What GPUs will give me GOOD speeds and on DSV4 Flash and similar models, and not have to run a mega quantized version? Budget around $15k-ish.

A user is seeking GPU recommendations for work, with a budget of around $15,000. The GPUs need to provide good speeds on DSV4 Flash and similar models without requiring heavily quantized versions. The setup will typically support one user, but occasionally 2-3 users, and should fit into a Dell R740, limiting the number of GPUs to three or less to avoid building a new host.

This query uniquely specifies hardware constraints like fitting into a Dell R740 and supporting 2-3 users, unlike general GPU recommendation requests.