The above statement is, quite simply, wrong.
I know others have already said it, but I wanted to be sure there was no confusion for the OP.
As for recommendations: an overclocked fx-6300 would do you just fine, sure, but it's not what I'm going to recommend. It can be a pain providing free tech support & I'm assuming your friend isn't going to overclock himself, so I suggest going with a locked i5 for optimal plug & play performance. So let's see... $500 but I don't have to include GPU, case, or (I'm assuming) OS? He'll probably have a crappy keyboard & mouse from the old dell, plus he can use the monitor from it as a secondary display. That said, I may fit a mouse in anyway just so he can go from some piece of crap attached to the dell to a quality mouse.
i5-4570 ($180 after promo code, promo code ends after 9/23)
MSI H81M-P33 ($53)
Locked CPU means you can get full performance from a cheap-ass mobo.
2x4gb RAM ($57)
RAM is so expensive these days.
(Your 6950 as video card.)
(Case already provided.)
Rosewill Green 530w ($55)
The Rosewill Capstone 450w @$64 is a bit higher quality in terms of power, but this Green is perfectly acceptable, cheaper, and probably has a quieter fan.
Seagate 1TB HDD ($60)
Asus DVD-burner ($16 after promo code)
For, you know, watching DVDs.
Subtotal: $421, plus for once the us.ncix.com total didn't go over $100, so you may have to pay a shipping charge on the HDD. Probably less than the $15 more it costs on newegg.com.
Edit: Oh, right. The mouse. I invariably recommend the Mionix Naos 3200. It's quite simply the best mouse I've ever come across. You never knew how much you wanted a pinky rest on your mouse until this ergonomic wonder shows up with one. Not for lefties, sadly.
$48 @ amazon
Bringing our total to roughly $470.
Edited by MisterFred - 9/22/13 at 5:54am