Question memory voltage increase

skyborg

Neuling
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Hi

I am doing some overclocking of GPU RX560 in Dell Inspiron laptop, model 5576. Facing an issue of unstable VRAM above 1650MHz, and complete system crashes at 1900MHz.

VBIOS allow only core voltage tweaking in wattman, no MVDD or VDDCI changes take effect. I found that I can change VDDCI by manually changing init value in ASIC table and tried VDDCI of 1.10V (default was 0.875V) but this did not help with stability or memory errors.

So I took DMM and measured voltages on board and put all in two pictures.

I'd like to hear an opinion on how the GDDR5 memory is powered on this system and a possible way to increase it. These are SKHynix modules rated as 3GHz/1.35V 3.5GHz/1.5V running at 1.35V defaultUntitled.png2TG9Mb1.JPG
 

skyborg

Neuling
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Mai 18, 2020
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5525 IC is actually G5335 10A buck converter. hardmodding its FB pin resistor allowed to raise voltage, and almost completely eliminated mem errors at freqs up to 1800MHz.

max voltage tested was with 1.8V idle - 1.75V under load.

at 1900MHz all seems fine with furmark, then suddenly 250000 errors are counted, sometimes system freezes and crashes - this looks like it'll need replacement for 15A converter
 
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