I think you will hear a big improvement.
I had a modest system in 2000 (Arcam Alpha 9 CDP, Arcam Alpha 10 integrated, Paradigm MiniMonitor II) when I first tried an after-market PC. My dealer lent me a Cardas Golden (not the Reference).
It improved the CDP no end, but the improvement on the integrated was slight. I ended up going with one of Bob Crump's cords - it made a big improvement on the integrated amp, and improved the CDP in a similar way to the Cardas.
Regards,