Satisfy some curious for me pics included

[Oldgamer51]

my fiance co 72 yr old mom is moving and have/had a windows xp.  the co worker ad it as a dell dimenision 8200 and i was cool the web said it was a pen 4...2.4 so i jumped on it.  i get it home and as as ad it was not barely used.  but i checked the properties and it said it was a dell 6300 1.63 1.gb and on the tower was stamped dimension 9200.  so now im scratching my head  cause i take the case off and i see a pcie slot, slot for 4 ram slots the hard drive and dvd drive has sata cables hooked uped, and a spot on the board for 4 more places to up more and some things i have i dont know see pics below. i would really like to know what that big black box is this looks was to hi tech no where a xp anything.  oh and the hard drive has 145 mb capacity.

[Niewidomy]

Looks like ordinary CPU radiator with attachment to me.

[Oldgamer51]

Not any cpu radiator ive ever seen before.

[KlopjerO]

if it still has a functioning OS installed on it 

try this app 
http://openhardwaremonitor.org/

it wil give you the info

[Oldgamer51]

Ima jump right on that as soon as i stop goofing on my main pc i only have one wlan card.....lol