Radeon r7 260x - settings + vram memory speed

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Hi, I rarely deal with radeons (it's my maybe 2nd time in my life) so I don't know what or how.



1.msi r7 260x - memory speed should be 6000Mhz or 6500Mhz or 7000Mhz (I don't know, different sites give different values)

in "hw monitor" shows me 1625 MHz under stress and in this program from AMD too - I can possibly overclock them at 1800Mhz (in amd application)
so it has to be ? does it somehow multiply or something?

2. I know that this is a weak card, so should I turn on / off something somewhere to make it as efficient as possible in games? some switching off the energy saving, turbo mode or other miracles? possibly some global quality improver etc. turn off? maybe some player mode or something is hidden somewhere?