24 ROPs per card are ok. You cannot simply double the technical specifications and assume you have a G71 with 48 ROPs and so on. The first thing you should do is to inform yourself about SLI.
Here is an Everest screenshot.
I posted this some days ago, but with no answer:
http://forums.techpowerup.com/showpost.php?p=499643&postcount=205 and
http://forums.techpowerup.com/showpost.php?p=500976&postcount=206
There are still missing data for GeForce FX cards, see the attachment for one example. This is also with other FX cards. Do you need further information?
GPU-Z 0.0.8 does not properly recognize my GeForce FX 5600:
Validation: http://www.techpowerup.com/gpuz/bpmnm/
I will post many other pictures with not properly recognized cards later.