XFX 7900XT merc 310 high junction temperature

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roko71

New member
I had the same problem with my Asrock PG 7900xtx, high delta between core and hotspot. Hotspot was above 100 in no time. After repasting and torquing it down with .4nm, problem solved(still way to hot though). Since the rest of the system was watercooled i bought a Alphacool Core block for Asrock since EK was no go for Asrock. It took a bit finding right torque values, i used .4nm again for the GPU core and .3 for the million other tiny screws. Now it is hotspot 70-80 degrees at full load(450watt with 3100Mhz) with 58 on the core(2x360 and 1x240radx54mm. I find that it is extremely important to check pad thickness and correct placement and then use a torque driver. I also torqued it progressivly .1 to .2 to .3nm etc. My only gripe with Alphacool is the restrictive flow, small diameter inlets on there blocks. I went from 250 L/H to 150 L/H, however perfomance is top notch.

Oh, and do put support under waterblock, i do not think Alphacool ever put their blocks on a scale before they sell them. It weighs a ton.
 
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DumSkidderik

New member
I don't have a torque screwdriver, but about the same time i posted my last comment i gave it another go with literally only screwing the 4 center screws in until the springs are compressed. They're very loose. It's been running with a Delta of about 15c now, which is a new Best. I still won't ever get another AMD or Alphacool product, but maybe it'll help some of you. And lots of Noctua NH-2. It's practically drowning in it....
 
Zetrol

Zetrol

New member
DumSkidderik said:
I don't have a torque screwdriver, but about the same time i posted my last comment i gave it another go with literally only screwing the 4 center screws in until the springs are compressed. They're very loose. It's been running with a Delta of about 15c now, which is a new Best. I still won't ever get another AMD or Alphacool product, but maybe it'll help some of you. And lots of Noctua NH-2. It's practically drowning in it....
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Will be interesting to see how it ages for you because my temperatures have been increasing quite a lot in just one year (around 15-20c increase on hotspot now). Using the provided AlphaCool paste, noctua wouldn't work at all for me (probably used to little) ;)

Will move over to KryoSheet when I have energy to empty the loop for the 6-7th time :D
 
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Tader82

New member
Well I have the XFX 310 RX 7900 XT and I'm having the same issues. The 22.9k scores are on the AIB air cooler and the 21 and 20k are on the Alpha cool AIO. The T-Delta is CRAZY 50+ degrees. The 20 was the first install and boy was that a fun night, the puter freaked right out like I had killed the mem, crashing with any moving video, wouldn't even load a game or benchmark. I was getting mad and so I walked away for the night and the next morning drove to SA, TX for 4 days to help little bro out. When I came back I said hell I'll try again and turned it on as is and it just worked (/SMH), but the temps were crazy and it throttled like mad (but no more mem issues /shrug). Tonight I tried some of y'alls points about torque and it did a little better, I used the sausage and dot method for thermal paste, but no go. We'll see how the Kryosheet and Artic thermal pads go. I got the Thermal pads as the alpha cool ones are falling apart and have hardened even more than they were when fresh, took some pressure to put a fingernail mark in one of the mem pads.

All testing is done in a room at 22*C.

Sorry for the google photo links my photos are to big to share direct apparently lol
https://photos.app.goo.gl/rSrV8C22EdL4qm4Y8
https://photos.app.goo.gl/s6dmbHjMzZoQh76H9
 
Zetrol

Zetrol

New member
Tader82 said:
Well I have the XFX 310 RX 7900 XT and I'm having the same issues. The 22.9k scores are on the AIB air cooler and the 21 and 20k are on the Alpha cool AIO. The T-Delta is CRAZY 50+ degrees. The 20 was the first install and boy was that a fun night, the puter freaked right out like I had killed the mem, crashing with any moving video, wouldn't even load a game or benchmark. I was getting mad and so I walked away for the night and the next morning drove to SA, TX for 4 days to help little bro out. When I came back I said hell I'll try again and turned it on as is and it just worked (/SMH), but the temps were crazy and it throttled like mad (but no more mem issues /shrug). Tonight I tried some of y'alls points about torque and it did a little better, I used the sausage and dot method for thermal paste, but no go. We'll see how the Kryosheet and Artic thermal pads go. I got the Thermal pads as the alpha cool ones are falling apart and have hardened even more than they were when fresh, took some pressure to put a fingernail mark in one of the mem pads.

All testing is done in a room at 22*C.

Sorry for the google photo links my photos are to big to share direct apparently lol
https://photos.app.goo.gl/rSrV8C22EdL4qm4Y8
https://photos.app.goo.gl/s6dmbHjMzZoQh76H9
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Hello,
Sad to hear, please make sure that the 3mm thermal pads are correctly placed on the backside (M & N)
(Not on the caps! but next to them, See page 10 in this thread)

1712066855469.png
 
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DumSkidderik

New member
DumSkidderik said:
I don't have a torque screwdriver, but about the same time i posted my last comment i gave it another go with literally only screwing the 4 center screws in until the springs are compressed. They're very loose. It's been running with a Delta of about 15c now, which is a new Best. I still won't ever get another AMD or Alphacool product, but maybe it'll help some of you. And lots of Noctua NH-2. It's practically drowning in it....
Click to expand...
Since my post almost 3 weeks ago, the card has consistently stayed at around 90c max, i think the solution is to drown it in thermal paste and barely screw in the screws. Works for me, GL fellas.
 
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Tader82

New member
XFX RX 7900 XT 310 Merc Stock Bios and AMD settings.
I have made it work for now, will see how it holds up for a couple of months. Hoping the temps don't creep back up like it does with the paste.
image_2024-04-07_032012505.png

So using Thermal Grizzly's KryoSheet (29x25x0,2mm), ARCTIC TP-3 Thermal Pads 1mm thick, and the Alphacool back pads (may change them out to a full cover pad on the GPU die like XFX had it). Highest temp over time in a 5 hour run in HellDivers 2 around 70*C with a 19*C-ish delta, at these temps I'm happy. I don't think the pump has enough flow and pressure to really keep the mem junction temps under 70*C for long runs. I have seen over 3Ghz on a 20% under volt but she wasn't stable for more than an hour and I haven't tried hunting for the stable under Volt yet. The pic is on the stock XFX Bios settings for the 7900 XT. AS for "torqueing" the screws I just ran them down till they stopped (I'm talking feathering the screwdriver with thumb and index fingers) and then gave them a gentle 1/8th turn more.

Here is the Idle temps.

image_2024-04-07_033809116.png
 
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IcyStorm

Member
DumSkidderik said:
If you really want to see how that works out, run Cyberpunk 2077 with RT on psycho, anything else won't really max it out.
Click to expand...

I have the ASRock Taichi version that hits overclocked 465W with spikes to 550W. On 4k CP2077 RT pshyho - 90C hot spot and 68-70C rest.That is on 7950 PTM.
I cant be more happy then that....
p.s Nothing else can hit 90C (RDR2 actually) and all other games hover around 75C hot spot max.
 
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DumSkidderik

New member
Zetrol said:
Will be interesting to see how it ages for you because my temperatures have been increasing quite a lot in just one year (around 15-20c increase on hotspot now). Using the provided AlphaCool paste, noctua wouldn't work at all for me (probably used to little) ;)

Will move over to KryoSheet when I have energy to empty the loop for the 6-7th time :D
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Took about 1½ months, but now the temps are horrid again. 110c hotspot. Either all XTX cards are trash or it's the Alphacool block. Seeing as they've given up on helping us, this will be the last Alphacool product i buy and I'll stop recommending their products to fellow builders.
 
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vircotto

New member
I replaced the Alphacool with a Bykski Water Block, I have better performance and cooling. I get about 7 degrees better GPU temp and about 20 degrees better Hotspot temp. The installation of the Bykski seemed a lot easier as well, however that also might be that I took off the Alphcool and put it together about 10 times so maybe I'm just more used to the process now :).

I can say I do not recommend the this specific Alphacool water block.


Byski.PNG
 
Zetrol

Zetrol

New member
I have finally solved it for my card (I think)
Just had a session of 6hours, tried Alphacool APEX but also Kryosheet with almost none in improvements.
Both gave 45-60c core and 90-105c in hotspot, tried repasting different thicknesses and different torqing multiple times.

Then I went back to Kryosheet (barely holding up at this time) added 3mm+1mm thermalpad covering the whole backside of the GPU die.
Now I have 42-43C, 62-68C in 4k stresstest.

Lets see how it holds up, my hope is that the sheet will do better over time, thermal pastes really degrade fast on this chipset due to the uneven design.
 
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bassochist

New member
vircotto said:
I replaced the Alphacool with a Bykski Water Block, I have better performance and cooling. I get about 7 degrees better GPU temp and about 20 degrees better Hotspot temp. The installation of the Bykski seemed a lot easier as well, however that also might be that I took off the Alphcool and put it together about 10 times so maybe I'm just more used to the process now :).

I can say I do not recommend the this specific Alphacool water block.


View attachment 6035
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i did the same aswell. and was amazed how much difference it made.
 
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ChaseBS420

New member
Made an account so I can add to this. I've been having the same issues as everyone here. I've just solved my issue with the high temps (for the most part (delta of 15-30° now instead of 50-60°)

I used the thicker thermal paste down the center of the die. Then used noctua on top to cover the whole die. Then instead of using the alphacool provided spring screws for around the gpu die I used the original screws that were on the stock set up. Take off the o rings around the gpu die and use the stock spring screws. Keep the other ones as is. Standard tightness. Didn't have to torque them specifically just did it by feel.

My temps were good at about 45° but junction temp would skyrocket past 100°

After several repaste attempts and constantly draining my loop and filling it and bleeding it every time I needed to try something else...this finally did it for me. I now have it OCed with max power and high clock and memory speed and during gaming the junction doesn't go past 60. Broke 26000 on timespy. Best of luck...
 

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beosliege

New member
I have the Core RX 7900 XTX Reference waterblock.

First issue: Instructions in the box do not tell you to remove the plastic spacers prior to installing the PCB. The updated instructions on the alphacool web site have this added as the first step, so there must have been a misprint in the instructions that went out in the boxes. Before I realized what was happening, the PCB had a VERY severe bend since I hadn't removed the spacers but I was trying to tighten the screws around the core. It seems I caught it in time to save the PCB, but as someone who is usually very observant and careful when doing this kind of work, this was really disheartening to see the instructions in the box lead me to bend my card so badly.

I put this card (and my loop) together twice. Once before reading this thread and once after. My temps are a little better the second time in some situations, but not all. There is still a tendency toward a ~ 30 degree delta under load, between GPU temp and GPU hot spot in HWiNFO. For some reason AMD Adrenaline doesn't usually report as high of a delta, but sometimes it does. This is with the card undervolted to 94%, stock power and clocks. At idle the delta is only about 6 degrees.

The first time I just tried my best to tighten the screws based off of "2-finger" guidance. The second time I used EK's 0.6 nm torque screwdriver on all screws (core and backplate) and I think this did give me a better result, but not by much.

I believe these are phillips #1 screws: I mistook them at first for JIS and stripped one out :( It would be nice if I had thought to look up what an "M2" screw is to realize it has a phillips head. The next time I take this card apart I will be using a screw extractor and will need to have a replacement on hand.

My next step is to add more radiators, because I think just having a single 280 mm rad is hindering my true longer testing on video renders and gaming that I have been doing. I am going to add back in my 120 mm and 240 mm rads for a total of 640 mm and then i will see if the temperature delta between GPU and GPU hot spot is more manageable or not. I think what may be happening is it gets unmanageable when there isn't enough radiator to remove the heat, because in the first few minutes it does seem to be under control (hot spot in 80s and 90s). But it'll go above 100 if a demanding workload is running for too long and then I have to underclock for it to be sustainable. I do video renders for hours on end that are very GPU-intensive and currently with this waterblock I must underclock my card to 80 or 90%, but hopefully more radiators will change that.
 
direstorm

direstorm

New member
I finally decided to bite the bullet and get a Byski waterblock for my XFX 7900XTX. I am very impressed with this new waterblock. I ran Cyberpunk on Psycho RT and the highest I got was 75 Celsius using Honeywell's paste. I was getting 95 Celsius with the Alphacool. I recommend if you have the money, get it. It is definitely the Alphacool waterblock that is causing these insane hot spot temps. Finally, I am happy with my watercooling endeavors.
 
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bassochist

New member
direstorm said:
I finally decided to bite the bullet and get a Byski waterblock for my XFX 7900XTX. I am very impressed with this new waterblock. I ran Cyberpunk on Psycho RT and the highest I got was 75 Celsius using Honeywell's paste. I was getting 95 Celsius with the Alphacool. I recommend if you have the money, get it. It is definitely the Alphacool waterblock that is causing these insane hot spot temps. Finally, I am happy with my watercooling endeavors.
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you know what's really sad about this, that this is going on for more then over a year, numerous people proved that there is a problem not with 1 specific block but with a whole bunch more, and alphacool is doing nothing about it, if you mail them for spare parts they say they don't have spare parts or seals and stuff like that to service the block, and they literally tell to go to an oring supplier and figure it out yourself to get them custom made, and then on top of all when you write a review about them, they try to accuse you of slander and lies and do everything about to get that review offline, they even go that far that they just plain lie about it, put that effort in solving the problems instead of trying to fuck a customer over that paid way to much for a shitty waterblock that doesn't work.
 
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Arran

New member
vircotto said:
I replaced the Alphacool with a Bykski Water Block, I have better performance and cooling. I get about 7 degrees better GPU temp and about 20 degrees better Hotspot temp. The installation of the Bykski seemed a lot easier as well, however that also might be that I took off the Alphcool and put it together about 10 times so maybe I'm just more used to the process now :).

I can say I do not recommend the this specific Alphacool water block.


View attachment 6035
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you should be much more worried about the 389W power draw than the coolong system. That's nearly a full 30% stock, what clock speeds were you getting for that extra power?
 
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