7900GTO was around -5% (0 up to -10%) slower than 7900GTX.
7900GTX is from around same speed with a 9500GT
per MHz up to 2X faster than a 9500GT
per MHz depending on the game/resolution/quality options/AA & AF levels.
To make it simpler:
650MHz core/690MHz GDDR3 mem 7900GTO 512MB has performance equal to a
650MHz core/900MHz GDDR3 mem 9500GT 512MB,
up to 650[/b]MHz core/900MHz GDDR3 mem 9600GSO 512MB.
For example in newer games (2007 and beyond) (high quality settings) like COD4,COJ,Crysis,Stalker,UT3 will be just as fast as a
o.c. 9500GT 512MB, and in older games (2006 and before) like Quake 4,SC3,FC,Prey will be just as fast as a 9600GSO 512MB.
http://www.nvidia.com/object/p...geforce_9500gt_us.html
http://www.nvidia.com/object/p...e_9600_gso_512_us.html
I suppose a 9600GSO 512MB or a HD4670 512MB will be a good solution (and of cource faster overall)