Red, so from all your trials, you feel that copper purity is secondary to Geometry and Dielectric? This is particularly important, because if copper purity or silver for that matter IS down the line,in importance, then this is a huge savings moneywise. I am with you on this as far as ICs go,ie; that a cable produced with great design and dielectric parameters AND mundane copper, will outperform one that has the highest quality conductors and lesser design. But, I never knew if this applied to PCs as well. Thanks for the help..........Frank