Over in the Hardocp forums, many people are reporting checkerboard backgrounds with all 8 pipelines enabled with either the software/driver modification only, hardware mods(resistor soldering/BIOS flash) or both. 
Those few 9500NP owners that were sucessful in the process did not obtain checkerboard backgrounds with various graphics tests just used only the software/driver modifcation. Different drivers to obtain different results were also used from the website below:
http://www.maxdownloads.com/~ian/wizzard/
Here are picutres to confirm this "checkerboarding" effect in UT 2003 and 3DMark 2001 SE as from the Hardocp forums thread below: 
http://www.hardforum.com/showthread...stid=1024262089
Most of the 9500NP owners in the thread up above, had also suggested that as future batches of 9500NP GPU's are released it could reveal better yields, thus lowering the number of potentially deffective pipelines.
Xbitlabs has a more detailed article explaining this below:
http://www.xbitlabs.com/news/story.html?id=1042408060
Anyone here at anandtech obtained good success with these modifcations on the 128mb 9500NP? I would really like to dump my capacitor blown Ti4200 for the 9500NP to save a bundle in the future. Or perhaps I could wait until the FX is realeased from nVidia? Can anyone here in forums resolve these described issues? I know for a fact that only a 9500np with 128mb red PCB say from Sapphire could be used to convert this into a 9700. 
What is the successrate. I do see there is a poll but I am curious to what else could be done.