No, if the guy was wearing white, it sounds like
Casshan: Robot Hunter. Now, if you're calling that old, I weep for my advanced age of 31. Granted, what was shown on Sci-Fi
was a remake of the original
Casshan which was a mid-70s show.
This is from the original 1973-74 show, but the character design did not deviate too much from this for the remake.