Hi newcomer and welcome to the Tom's hardware forum.
Should fit without problems but be sure that the CPU can works in that mobo.
Ok here is my dilema the only thing that is wrong with the c521 is the motherboard , that is the cpu tested fine heat sink and shroud look like they may fit after all its all going back in a c521 case right , oh yeah the e-521 has two pci slots the c521 has only one plus a pcie slot , its ok because ill be using the on board video. so i dare ask againg and im really concerned abot clearances will the e521 fir into a c521 case? r
Thank you all for the great advise we (the customer) found a HP pav n305a that would suit his needs, reload the os added 1 gig memory and we are off and running. Now i have a carcass laying around , might make a bird house out of it and the bad mobo wall art. But seriously thanks to all.
No fun in that. lol
I hope it all works out for you.
I'll take that c521 case off your hands.
I think i'll keep it cause i think i may have found a mobo in the pile at work that they pulled as spares but thanks anyway