[Amps] PS Theory (cap int res)

[kenw2dtc]

I have a bank of these computer grade caps in series:  2400 mfd at 450 vdc,
2.5 inches in diameter and 4 inches long.  It looks like the PSU Designer
program shows noticeable ripple if the internal resistance of the filter cap
is too high.  How do I determine the internal resistance of my computer
grade caps?  Is there a formula, or can they be measured with regular shack
tools, or is there a ball park figure for computer grade caps, or perhaps an
old wives' tale.
73,
Ken W2DTC