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Please help to reduce memory voltage on ASUS 280X DC2T

post #1 of 8
Thread Starter 
Hi. Want to try to lower memory voltage in a hope to resolve artifacting problem on stock clocks, as alsost everything else already tried (heatsinks, timings, custom software solutions, raising voltage).

ROG ports allows only to raise the voltage, but it increases artifacts linearly. MSI Afterburner's slider does not affect the real voltage, other tools does not show sliders for vMem at all.

Please assist.

The only thing I've found is a short advice to replace PR518 with 133Ohms "which is exactly what ASUS service does", but there's no such mark on the board.
post #2 of 8
Thread Starter 
Today I've tried to use 10K and 5K Ohm resistors between MVDD and ground, this didn't affect memory voltage at all, and I was afraid to go further to not overload power regulator.

Found information that Asus GPU Tweak allows to control memory voltage for Matrix/Matrix Platinum cards, so flashed the bios with applied id change, but card didn't even boot. Well, there was a lot of differences in bios dumps between matrix and dc2t. Just to be sure tried to flash DirectCUII non-TOP, it booted but wasn't able to install a driver.

Please, can someone familiar with developing voltmod solutions from scratch assist me?
post #3 of 8

*to lower voltage below stock.. you would need to raise resistance at the mod point.

 

If increasing resistance does not lower beyond the stock limit, you would need to replace the resistor with a larger one.

 

*Have you tried just editing the BIOS to use lower mem clocks before this vmod option? Speed generates heat related failures too..

post #4 of 8
Thread Starter 
Quote:
If increasing resistance does not lower beyond the stock limit, you would need to replace the resistor with a larger one.
I'm not working with any resistor - there's ROG/HotWire port on the card, so to increase voltage I've just shorted the ROG enable points and connected OVM to ground with 3-5KOhm resistor. So OVM allows only to increase voltage - if break it, the voltage will be stock. Maybe it will reduce the VMEM if apply voltage to OVM from, for example, 1.5v battery, but i'm afraid to perform such experiments.
Quote:
*Have you tried just editing the BIOS to use lower mem clocks before this vmod option? Speed generates heat related failures too..
Tried, of course, 1400 looks pretty stable, but I hope to get 1500-1600 stable with 1.5v. I want to use this card in crossfire and trying to make it symmetric as possible without having to slowdown other card, which is same 280X DC2T and runs 1850MHz without any kind of tweaks.
Edited by xfxfx - 2/10/15 at 8:05am
post #5 of 8

the ROG points are secondary to the circuit... so they can only increase. Modding the resistor in the circuit responsible for setting stock value is the only way to accomplish what you seek. I would also love to know where its located.. tracing through this PCB is not an easy task.

post #6 of 8
Thread Starter 
Quote:
tracing through this PCB is not an easy task.
Almost impossible without special knowledge or voltmod experience. The voltage on that resistor doesn't have to be 1.6v, and there's absolutely no any known mechanism to change the voltage generated by "primary circuit" to trace the change - even when voltage is raised with ROG/HotWire, MSI Afterburner still shows 1.600.

It could be possible by deep compare 280x DC2T with other DIGI+ card and v1.5 vmem like DC2T-V2,DC2,Matrix or 7970DC2T, but it's even more unreachable condition to find someone who have both 1.5 and 1.6v cards and wants to do that.
Edited by xfxfx - 2/10/15 at 8:55am
post #7 of 8
I can't believe that only 2 people on the entire internet tried to work on reducing the mem voltage on this card. Because I also believe that this is the only correct solution.
All the other stuff like applying heatsinks etc. is nonsense. Unfortunately I also think that the memory simply becomes irreversibly damaged from the overvoltage.
Still I would love to know the solution to this....
post #8 of 8
V1 or V2?
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