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RX 470 BIOS editing and modding

 
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post #1 of 3 (permalink) Old 05-14-2019, 06:32 PM - Thread Starter
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RX 470 BIOS editing and modding

Hi. I've been trying to overclock my "Strix" RX 470 from ASUS but I think I've hit the power limit wall since the card throttles even if temperature is lower than 70C, I used afterburner to bump the stock limit (which seemed to be 95W) +50% (143 ∓2) but it still throttled on Superposition and certain games when trying to run at 1400MHz (stock: 1250).


It was time for a VBIOS edit which I did, although I only raised the power limit to 150W because I'm not really sure how much power I can draw using a single 6 pin connector, some say only 75W but others say up to 150W since the +12V wiring is the same for both and the 8 pin connector only differs in the amount of ground wires.



Thing is, the PCB has the two remaining holes for the connector pins available and I could swap the existing 6 pin con for an 8 pin con and call it a day BUT after some research I couldn't find a detailed diagram of the PCB so I don't know if those holes connect to the rest of the power delivery circuit or are just dummies. According to the ASUS site the 8GB version of the same card uses 8 pins so maybe they used the same PCB for both but decided to use the smaller connector for the 4GB card, I can only wonder.


PS. I've repasted the GPU, removed the plastic shroud and replaced the stock fans for 2 120mm 2800RPM turbines and temps dropped by almost 17C, max under a furmark load was 74C, while rendering, which is what I use the card for, temps are in the mid 60s



To sum up, my questions are:


How much power can I draw from a single 6 pin power cable?
Would replacing the connector on this card work?
What would be a reasonable power limit in the VBIOS for long term usage?
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post #2 of 3 (permalink) Old 05-17-2019, 12:29 AM
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The 6-pin PEG connector with three + 12V cables and standard terminals (plugs) approved for 8 amps are 288 watts.

HCS terminals, released for 11A - 396W.
Plus HCS terminals 12A - 432W.

The limiting factor is just the power supply and the MOSFETs.

A copper cable with a diameter of 1.024mm (AWG 18) is sufficient for 11A.
For 13A - 1.291mm (AWG 16).
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post #3 of 3 (permalink) Old 05-19-2019, 05:20 PM - Thread Starter
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Quote: Originally Posted by Lard View Post
The 6-pin PEG connector with three + 12V cables and standard terminals (plugs) approved for 8 amps are 288 watts.

HCS terminals, released for 11A - 396W.
Plus HCS terminals 12A - 432W.

The limiting factor is just the power supply and the MOSFETs.

A copper cable with a diameter of 1.024mm (AWG 18) is sufficient for 11A.
For 13A - 1.291mm (AWG 16).

Thanks for the reply. I've been running the card with a 180W limit and so far everything works
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