Definitely neat seeing those results. Great job on the results, reporting and mod. Was it as easy as Gamers Nexus made it out to be?
Disassembly of the card was easy, the only awkward part was disconnecting and reconnecting the cables on each side, one for the fan and the other for the LED, the cables are short so you can only separate the PCB and cooler just enough to get your fingers in there and you are doing it one handed if you want to support the card in the other hand.
I found a post by someone modding a different AMD GPU, I thought he had the good idea which was to put extra spacers under the metal clamp towards closer to the center of the gpu, hopefully allowing for more pressure and contact with the middle of the die.
I also tried this mod but I didn't really notice any difference in temperatures, also I didn't like how much extra pressure the bracket was now under and I worried that it may lose its shape and bend over time causing it to lose pressure and contact. I ended up bringing both ideas together and putting washers under the screws and spacers under the clamp, this in my opinion has helped to increase the pressure more evenly over the die and also stopped the deformation of the clamp, this also actually lowered the temperatures 1 or 2 degrees more
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I do miss the old ways of overclocking, increasing core, memory and shader clock speeds until it becomes unstable and then dialing it back a bit and it was great when more gpu's started to allow control over vcore so you could push for the little bit extra.
I have overclocked many gpu's over the years, my most recent overclocking experience has been with the 980 ti, 1070 ti, 1080 and the RX 470, and the 5700 xt acts differently to all of them. Of course we all know that years ago there was no turbo boost, you just entered the clock speed you wanted and the gpu for the most part was stuck at that speed, and from my experience even when gpu's started to come out with gpu boost they would still boost to the frequency you set if temperatures and power limits permitted it, but the 5700 xt is different. Usually my overclocking goes as follows: Max out the power limit and check temps, find the minimum vcore needed to run stock settings, increase core clocks until unstable, increase vcore to stabilize, if temperatures permit continue to increase clocks and vcore until the card hits its max frequency or until the point that vcore increases only gain greatly diminished core clocks to the point that its not worth continuing, and then move on to memory.
With my 5700 xt you can set the core clocks to whatever you want, but it won't go much over 2100 no matter the settings. At stock the core runs in the 1880 to 1950 range, increasing the power limit to 50% brings it up to around 2030, then increasing the core from stock 2090 to 2150 gets you to around 2100. At this point the temperatures are maxing out in the high 80's, increasing the fan curve can reduce the temperatures by about 10 degrees, but this has no impact and clocks stay the same. Now the only way to raise the core speed is by reducing the voltage as low as possible and this will only get you an extra 10 to 15mhz and the power limit can be reduced all the way down to 10% before it effects the clock speeds. So now I have a card at a reduced voltage from stock, at a power limit of only +10%, running a max core temperature in the mid 70's, a max memory temperature in the high 60's and a max vrm temperature in the high 50's. This is where my 5700 xt differs from other cards, any other card I've had with voltage, temperature and power limit headroom would be trying (stable or unstable) to boost to a higher core clocks. Now this suggests to me I am not reaching the cards maximum overclock and I'm more likely to be hitting a limit built in by AMD, I guess if I want more I will need to do a SoftPowerPlay mod.