Ha I know that - I just dont have another PCP&C to compare to, I was never sure if the SLi certification was more a formality or an internals job - for all I know the Deluxe could have had 2 aswell
All the 510's have the same internals (apart from fan changes), so it is just a question of how it is wired, original deluxe had no 6pin, then had 1 and the SLI has 2.