Flashing My Reference 290x to a 390x
R9 390x has higher memory clock speed (1500Mhz vs 1250Mhz) and tighter timings (even with lower clocks).
R9 390x also has higher stock voltage +50mv which results in higher VRM1 temps.
R9 390x BIOS has different RevID=(80) compared to r9 290 RevID=(00) which means drivers for R9 390x won't work unless you inf mod it. Also no one has been able to change the RevID for r9 290 so fat.
Even R9 290x that has Hynix memory has problems being stable with downclocked memory (1250Mhz) and it is much worse if you have elpida.
Even the modified bios by netkas that downclock the memory to 1250Mhz and has adjusted the memory to 4GB, it is causing instabilities due to tighter timing and higher VDDC of R9 390x.
Dropping the memory frequency below 1250Mhz on Hawaii cards results in sharp performance drop as the timings get loose.
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