Ok well they seem to be exactly the same card so I'm not sure why one is 20$ more...
One is overclocked slightly.
Don't spend 20$ more for that, clock it your self or like I said get a 4870 for less it's nearly the same card and does nearly the same benchmarks.
[Edited by shianova, 4/15/2010 12:20:46 PM]
The two 4870s on Newegg.
One is four dollars cheaper but doesn't have free shipping.
The other is more expensive and also doesn't have free shipping.
Don't get any 5000 series cards everyone is having a lot of problems especially 5770's its due to the drivers wait until they say they have fixed Grey screen and vertical line crash it continuously crashes for me but with my 10.5 beta drivers there's a lot less crashes.
Doesn't sound like a big problem for most people, and they're fixing it so meh.