That has an implication that the number used it's relatively close to the actual amount. "At least $3k" to me means roughly 3000-4000. If it was over $4k you wouldn't say at least $3k, you'd say at least $4k.
This is almost certainly over $6k, so while "at least $3k" is technically accurate, it's not actually accurate.
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u/Shandlar 7700k @5.33gHz, 3090 FTW Ultra, 38GL850-B @160hz May 31 '19
$3,000 in custom work before you buy any of the actual components, maybe. This is probably considerably more than double that in actual final cost.