Originally posted by: anomaly
The other difference is with the ram used. You can generally OC the NP to Pro speeds, but you can also OC the Pro to super high speeds. Another thing to think about is even the R9800 Pro isn't really ment to handle real-time Sub D, which the environment of HL2 is going to be based on. Given its power, it will ceartinally be able to handle it, but it won't be near the best for it by then. I was in the same position and decided to go with a 9500NP for the time being, and to buy a R4xx chipset card when HL2 comes out.
No Offence, but will you STFU about enviroment deformation in HL2. You are telling everyone that its a performance killer, even with the latest cards, when we`ve already established in another thread that its not the hard to do, and not that performance intensive.
All video cards above GF3 power have more than enough polygon pushing power to do the deformation in real-time.
The HL2 E3 demo was ran on an 9800pro, and it handled it more than well enough. You are trying to use a rendering term that while may be applicable to some types of rendering, is not applicable in any way to the rendering used in video games.
Back to topic.
The 9800np can be OCed to 9800pro levels, but also bare in mind, that in stock form, the 9800np is slower than a 9700pro.