So did some testing and made my video link here for my results. https://m.youtube.com/watch?v=Eg6JN8U35ps
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I’m still interested in that 5600… would be a lifesaver. O
I don’t think you want to push that card much more without addressing the memory temperature. In fact, it may be throttling because of the temps. I know if you look on youtube there are guides on replacing the thermal pads (I believe the MSI versions used thermal pads that were poorly placed AND too small, which might be your issue).
BUT, aside from that you will want to increase the clocks for both the memory and core to increase hashrate. See if you can do something like 1370 760/780/1300 910 and set the fan to at least 95%. You may also want to position the card so it gets the “freshest / coolest” air.
Are you running the stock vBIOS, or have you modified your BIOS? If it is stock I think you are about as good as you will get. I think HiveOS mis-identifies the PowerColor memory as Micron sometimes - because all of mine behave like Samsung memory and have a mix of the two when editing the BIOS.
I think the #1 thing that you could do is follow the directions over at Igor’s Lab for applying the Apple Memory straps on the 5700xt, or at a minimum copy the memory straps for the 1500/1550 to all higher memory functions.
Hello @SybrBlue, thank you for reply.
I have done change thermal pad, now i go around 92-94° instead of 102-104° (i confirm that MSI thermal pad are not enought and very small)
I will try your setting and tell you.
Edit : i have tested go to 55.90 mhs temp 53° mem 104°
I don’t think this is good for the cars to be so high…
Thank
Greetings … I am running stock. I will do as you stated, and see how it goes. Thanks!
There is a whole write up here: https://www.igorslab.de/community/threads/gigabyte-5700-xt-bios-mod-fails.3304/page-2#posts
Page 2 gives good step-by-step instructions, but as you can see there is plenty of discussion and optimization as the thread is now into a good 70 pages…
Czesc, widze, ze uzyskales bardzo fajne parametry pracy a wlasnie szukam biosu do msi rx 5700 xt mech oc. Mialbys jakis bios? Z gory dzieki za pomoc 
Flash your BIOS
I actually have ‘problem’ with my ASRock 5700 XT Challenger. My memory temperature and FAN speed seems to be bad. I got really hight temperatures while my room temp is around 17 Celsius.
Is this normal? Im scared that this GPU can have issue because working on this high temperatures, i really want to avoid to have my GPUs damaged because of high temp. What should i do?
Try AutoFan function from HiveOS and set a memory temp target at 75°
my fans works at 100% then whole time, and its not stable
Do you have FAN behind the cards that flow fresh air in it (like all RIGs) ?
Ironic mode ON
NexT time buy real trademark GPU 
Ironic mode OFF
OR just fans to exhoust the heat out of the rig.
show us scree after autofan
More Hash.
Does the computations quicker.
awesome your saphire (samsung) MEM Clock can 900
my red Devil (Samsung) if 900 and above will get Invalid Share
max higest MEM clock is 890
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hi dj_kg, I just got the same card (ASRock 5700 XT Challenger) and I also have high mem temps. Did you ever figure out how to address the issue? The cooler on this card looks awful.
Also, did you bios mod those cards? I can’t get my card stable over 54 MH/s. If you did mod the bios, could you point me to the instructions you followed?
Thanks for any help you can offer.