1) Whatever company that made that Nvidia 9800GT graphics card, isn't going to produce a schematic for the general public.
(EVGA, VisionTek, Galaxy, Sparkle, BFG, etc.)
They paid big bucks to Nvidia for the GPU, the schematics, and all licensing fees.
2) If you indicate that you believe most of the capacitors, (Radial Aluminum Electrolytic Capacitors), are of the same values, capacitance, and voltage, then remove another one of them, and test the capacitance.
Multimeter set to OHM's. An economical unit can be purchased for around $5 to $12.
Most auto parts stores carry them, as well as a multitude of other stores.
3) The Radial Aluminum Electrolytic Capacitors you are looking at, have the values printed on them. They are just in the capacitor manufacturer's code.
http://www.hardwaresecrets.com/article/595Page 2 of the article starts with the identification of the markings.
Page 3 dealing with capacitors manufactured in Japan.
Page 4 deals with capacitors manufactured in China, and Taiwan.
Regards,
joecoolvette
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