So it seems aftermarket cards use Hynix memory and do not seem to overclock so well? Few I have seen struggle to maintain 950.
Were all reference cards Samsung memory?
Mine are Samsung (Vega 56) One card can't go stable beyond 900. Some of them start failing around 930. One I tested worked at 980 but I don't know which one now and it takes forever to try one by one. So currently my rig has 1 card at 900 and 5 cards at 925. Maybe Samsung mem is overrated?
afaik they need 1.35v on HBM2 memory to reach those clocks (Vega 64). Vega 56 you're limited to 1.25v. perform a bios mod to Vega 64 to get 1.35v.
Even I own a samsung reference Vega 56 and can't do more than 925 without errors. I have settled for it as of now since it delivers 1925 on cryptonight. Haven't tweaked it much apart from the fact that I would like to get the power draw below 145w or so. Right now they take 150-160w