Sapphire HD7870 OC vs Sapphire HD7850

MiDNiGhT2903

Honorable
May 29, 2013
195
0
10,710
The title says it all.
I'm looking for a card that is best bang for the buck (best performance/price).

I'm not sure about the performance but here's the price.
Sapphire HD7870 OC : $349
Sapphire HD7850 : $267

The prices are in SGD (local currency).
 

MiDNiGhT2903

Honorable
May 29, 2013
195
0
10,710


I see.
Then I guess I shall be saving abit and go for the HD 7870.
Anyways, on a side note, is the HD7870 better or the GTX 660 better?