Are you really determined to keep a 7 year old graphics card working? Because if you're having issues with one cap now, and actually manage to de-solder and replace it with another equivalent part, every other part on that board is the same age and has gone through the same number of thermal cycles. I honestly recommend (and I still run a GTX 285 in a standby machine) moving up to at least a 500 or 600 series card. You should see a good jump in performance and ability; the Zotac 250 Eco was underclocked out of the box to keep it from overheating.
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Are you really determined to keep a 7 year old graphics card working? Because if you're having issues with one cap now, and actually manage to de-solder and replace it with another equivalent part, every other part on that board is the same age and has gone through the same number of thermal cycles. I honestly recommend (and I still run a GTX 285 in a standby machine) moving up to at least a 500 or 600 series card. You should see a good jump in performance and ability; the Zotac 250 Eco was underclocked out of the box to keep it from overheating.