ASUS TUF Gaming A15 FA507UI RAM temperature limit bug

[ExtraXcess]

There is a memory temperature limit on this model by mistake, which decreases the performance of the laptop and causes stutters in CPU intensive games or gaming on iGPU which stress the RAM.
DDR5 SODIMMs can easily handle 105-115 degree but your limitation is something between 75-80 degree.
I have uploaded a screenshot of both 2023 and 2024 model which both of them running a game on iGPU. The 2023 model gives me the full performance and the game runs smooth with 108 degree on RAM, but the 2024 model decreases the RAM bandwidth suddenly to half when it reaches 75 degree and causes huge stutters in game. Note that I have exactly the same 64 GB RAMs on both models and as the capacity goes up the power usage also goes up. It works fine with 16 GB and never goes above 70 degree.

Since it's an advanced issue, I want to talk to an actual ASUS Engineer.


TUF A15 2023


TUF A15 2024

[ElectroStingz]

Hello,

You should also check the chip specification, look at the crucial memory IC and get the part number / cross check on Micron's website for the operating spec, some are +95 Deg C max so it will throttle well before that.

[ExtraXcess]

I couldn't find anything about the max temp of my crucial memory. What I have found is, it can be something between 95-115 degree. Even if we say mine is 95 degree max, it throttles at 75 degree which is 20 degree less!
And on my A15 2023 laptop, I put it in a hot place and it works fine, even reaching 113 degree and still doesn't throttle, so I'm pretty sure it's the laptop itself that throttles at 75 degree on 2024 model not the RAM.
What is the point of DDR5 5600, if it actually works like DDR4 2800 because of this issue, while the RAM can take much more temperature? I found this issue because my 2024 model of A15 with 4070 performs worse than 2023 one with 4060 in CPU intensive games or gaming on iGPU even in cold places.
These high temperatures are normal, since the internal temperature of the laptop can easily reach +80 while gaming, because the CPU can reach 95-100 and GPU to 87-95.
I had ROG G16, Lenovo Slim 5 and used the RAMs that i have now on them and none of them had this issue.
I also tested a SAMSUNG one with max temp written 115 in the datasheet and still have the throttling issue.

[ElectroStingz]

You need to look at the memory chips for the part number, or take a pic and post.

But if both are ddr5 then swap them out from laptops and see what happens?

Also note max temp is the limit so it will have to throttle way before that.

[ExtraXcess]

I doesn't matter since I tested 2 x 16 GB SAMSUNG one with max temp written 115 in the datasheet and still have the 75 degree throttling issue. It's the BIOS which does this limitation and I don't have access to those settings to disable them.
As I said I had ROG G16, Lenovo Slim 5, TUF A15 2023, TUF F15 2022 and none of them had this issue.
Imagine I put 128GB then it will throttle just being idle!

ASUS ships the device with 16 GB memory. They tested it and said: "OK it doesn't even reach 70 degree so let's put a 75 degree limit on it."
But they forgot about more memory generates more heat and now I have problem with more than 16 GB memory.

Still even if the memory doesn't get so hot they should not put a 75 degree limit on it as it is so low. Even GDDR memories operate at 100 degree in most graphic cards. Isn't it odd that on this laptop the GDDR6 memory has an 115 limit but the RAM has 75?

[ElectroStingz]

And the other way round, if you took the ram out this laptop and tried in the working one?

The reason I say this is that the ram is self regulating and doesn't rely on the bios to control.

The SPD hub sensor data is for vendors to use for active fan control.

[ExtraXcess]

I know and I even tested with one RAM installed on both slots and still the same issue.
The BIOS actually uses the RAM sensor and put a 75 degree limit on it while the RAM itself can work at much higher temps.