wrote:

I have this GF-8600 Graphic cards which has 4 1500mf 6.3v out of
which 3 caps have blown up. Should I change the same type or get caps
say more than 6.5v or bigger than 1500mf ?

The originals are soldered with a higher temp. than my soldering Iron
can handle. I am thinking of soldering the new ones at the back with
ordinary solder, and leave the original as it is.

Higher voltage or higher capacitance won't help but means capacitors
that are bigger, maybe too big to allow another card to be plugged
into the slot next to the video card.

With a lead-free solder, adding 60/40 tin/lead solder and sucking it
up can lower the melting point enough so you can unsolder with a 40W
iron. But I sometimes cut the capacitor on the top side so each of
its leads can be removed separately.

Is this an EVGA brand garphics card? They sold many with capacitors
that looked like solid polymers but were actually regular wet
electrolytics (slits on top were barely visible until the caps
swelled), and pretty bad Sacon brand at that. Later version EVGA
cards substituted Sam Young brand capacitors, which were better but
would still fail from prolonged heat, and later they switched most of
those to Panasonics.