Please identify these capacitors

[everell]

This is Biostar 7600 PCI express video card - one of capacitors in circle is bad. These are NOT surface mount - they are thru hole capacitors. Value appears to be 680 UF, but am not sure of voltage. Are these polymer caps? Also, what would be best brand for replacements?

[etnietering]

Re: Please identify these capacitors

Well no, they're not polymers, but they're made to make you think they are. The 'K' vent pattern scored in the top gives it away. I don't know about the voltage though. The '4J' might indicate 4 volts, but I really have no idea, somebody else might be able to help you out with that. Or, you could put it back in, turn the computer on, and measure across the leads while it's on. You could probably replace them with real polymers, though. Good luck!