I'm currently using a 5700 XT with a Kraken G12 bracket to hybrid cool the GPU. VRAM and VRM temps are under control, the GPU Edge Temp never hits above 65-70c BUT the Junction or Hotspot temperature seems to Skyrocket even with an undervolt.
I'm steady at a 1105 mV undervolt with +20% Power Limit and the Memory OC'd to 900 Mhz.
Core Clock is kept at 2100 Mhz max and I have a custom fan configuration with the VRAM / VRM fan running and the push / pull on the radiator set to run at 100%.
The only thing I could think of was that I wasn't making good contact on the GPU but that doesn't quite make sense if I'm still achieving strong edge temps. With the junction behaving the way it is my hopes of getting the maximum performance out of this card are pretty low.
Before I ran these numbers today I went ahead and re-seated the AIO using MX-4 thermal paste. If anyone has any idea of what I could do to improve that Junction temperature so I can finally game / benchmark my card without any worry please let me know!
Did you look at the dispersion of the used thermal paste to see how the mounting pressure is? Perhaps you’re not getting even mounting pressure across the whole die.
You didn't mention what Junct.temp Why 110-Degree Temps Are Normal for AMD’s Radeon 5700, 5700 XT
110* is in no way normal for junction temp with a sufficient cooler. 110* happens in some situations with the reference cooler, however it’s not ideal. Sapphire RX 5700 XT Pulse Review: Thermals, Noise, & Overclocking - YouTube
See 4:00 for a chart comparing the reference 5700 xt to the sapphire pulse edition.
G12 is not suited for rx 5700, it doesnt cool all the necessary parts, if you want to use hybrid look on ebay for an accelero-hybrid-ii, which works the best (i have it too on my second RX) or hybrid III. Hybrid II is using the same backplate cooler as Extreme IV (also tested on RX 5700 XT) and the temps are really good, with your undervolt junction will stay between 50-65 degress and core temp between 50-67 (Extreme IV), i also managed to OC the core to 2100 (Extreme IV), with Hybrid the temps might be a bit lower.
I wanted to wait a few weeks before I put in an official reply updating what I've experienced so far.
I ended up fully removing the G12 and reapplying thermal paste, ensuring that it was getting maximum coverage with firm and even tension on over the GPU. I have heatsinks on the VRMs and VRAM.
While depending on the game I will still occasionally see spikes into the 105-110C range for the Junction (hotspot), the average temp does not ever get over 85C and the overall GPU temp stays around a nice 67-75C under full gaming load after several hours.
Mind you I ALSO have a 240mm rad for my CPU that blows ACROSS the motherboard, out the back where the 120mm rad is for the GPU. So not only do I have hot air going through the GPU rad BUT it's still maintaining incredible temps. Overall I'd say that the G12 looks incredible in my new case and I'd be more than happy to share if anyone is interested.
The hybrid arctic cooler doesn’t look like it really does anything differently than the g12. Its been tested and proven that graphics card VRMs can be cooled just fine using a fan without heatsinks. Vram doesn’t really need to be cooled for the most part, it usually runs at acceptable temps with or without cooling.
Those temps still seem rather high for water cooling. What size rad are you cooling the GPU with? Do you have a super quiet fan curve?
Edit: I didn’t see you said you have a 120mm rad, I suspect that’s probably causing the relatively high temps, especially since it’s got warmed up air going though it from the cpu rad. However I do wonder if perhaps the GPU die is slightly recessed in the chip, causing the water block to put more pressure on the edges of the chip rather than the die. That’s probably not the case though, just a thought that crossed my mind.
That is too hot and as far as i know there was a review on youtube testing the G12 and it failed for RX the cards and it even didnt finish some benchmarks, so G12 absolutely not, but of course it is your decision.
I have a 240mm rad too, but the hot air should go out out of chasis, so hot air from your CPU blowing on your motherboard, woah.
G12 might look "incredible" but your temps are "incredible" too.
Like i said Extreme IV or Hybrid II, core was never above 67, Memory temps between 50-65 degrees, Junction never went above 80 (only when i used overclock to 2100 and a higher voltage), junction stays always between 45-70, depends on usage.
"Its been tested and proven that graphics card VRMs can be cooled just fine using a fan without heatsinks" That is so not true!!! But lol, if you want to have a good locking cooler and a damaged card, fingers crossed, but please do not advice it to people, no offence, but it is a very bad decision.