Hum,
It’s just a question on how much room it leaves.
If the air flows and it doesn’t make contact with anything then it’s probably ok....
What voltage is it? 3.3v?
Can the mobo take that? (it should, cos it’s `standard`)
Remember that for that £30 you can get a geforce fx5200 , 128mb ram and is dx9 compliant....(they all use just one driver too....)