Hi
I have some repaired some cards with Micron D9TCB Memories. Most of them have 1,5V FBVDD, but some, eg MSI GTX1070Ti Gaming X have 1,35V FBVDD. I'm now just struggling with this MSI card. It is not an bad card, as in the VRM there are two different resistors which set the different voltages (checked this between two such cards, with different memories Micron 1,35V and Samsung 1,5V). Replaced GPU and one shorted memory and card hardly works, only in VGA mode, and with lot artifacts.
I have the impression that replacing a D9TCB memory on a card with 1,35V FBVDD with a D9TCB chip coming from a card with 1,5V FBVDD then the target card does not work and has memory errors.
I suspect there are two different versions of D9TCB memory, or maybe they are only selected chips ?
Micron site states only these GDDR5 8GB memories with 1,5V and 1,35V:
MT51J256M32HF-80, 8Gb, GDDR5, 1.5V -> marking D9TCB
MT51K256M32HF-60 N, 8Gb, GDDR5, 1.35V -> marking D9VVW, so different marking
Does anybody know how it is ?
How can a D9TCB card with nominal 1,5V work with 1,35V supply voltage ?
I have some repaired some cards with Micron D9TCB Memories. Most of them have 1,5V FBVDD, but some, eg MSI GTX1070Ti Gaming X have 1,35V FBVDD. I'm now just struggling with this MSI card. It is not an bad card, as in the VRM there are two different resistors which set the different voltages (checked this between two such cards, with different memories Micron 1,35V and Samsung 1,5V). Replaced GPU and one shorted memory and card hardly works, only in VGA mode, and with lot artifacts.
I have the impression that replacing a D9TCB memory on a card with 1,35V FBVDD with a D9TCB chip coming from a card with 1,5V FBVDD then the target card does not work and has memory errors.
I suspect there are two different versions of D9TCB memory, or maybe they are only selected chips ?
Micron site states only these GDDR5 8GB memories with 1,5V and 1,35V:
MT51J256M32HF-80, 8Gb, GDDR5, 1.5V -> marking D9TCB
MT51K256M32HF-60 N, 8Gb, GDDR5, 1.35V -> marking D9VVW, so different marking
Does anybody know how it is ?
How can a D9TCB card with nominal 1,5V work with 1,35V supply voltage ?
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