Hi guys, i have gtx780ti 3gb msi with artifacts, in mats i got that

=== MEMORY ERRORS BY SUBPARTITION ===
SUBPART READ ERRORS WRITE ERRORS UNKNOWN ERRS
------- ----------- ------------ ------------
FBIOA0 0 1747968 0
FBIOA1 0 0 0
FBIOB0 0 0 0
FBIOB1 0 0 0
FBIOC0 0 0 0
FBIOC1 0 0 0
FBIOD0 0 0 0
FBIOD1 0 0 0
FBIOE0 0 0 0
FBIOE1 0 0 0
FBIOF0 0 0 0
FBIOF1 0 0 0

Am i right that second chip marked as "A" on photo is broken? i changed that chip and chip "B" and still i got same error and artifacts, I heated gpu and reflow it and still the same issue. What im doing wrong?

yes, you are right.
may be check for broken trace?

I will check as soon as I will be at home, but if traces are fine so what could be wrong? Memory controller in gpu? I have good gpu from 780, could it be swapped only with change bios?

это либо след, либо шарик припоя под ГПУ или сам ГПУ ..