#Cooling RTX 3090 FE VRAM Chips

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light warren
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I recently modified my 3090 FE with an, again modded, Kraken G12 GPU Bracket and a fractal design 360mm AIO Cooler. I used the aftermarket thermal pads I had put on previously to place small aluminum heatsinks on to cool the VRAM and other hot components on the PCB. After testing, the die itself is an icy cold 55-65C under load in Cyberpunk 2077. Although, the fps drops shortly after gameplay starts and the power consumption drops from the limit of ~398W down to 190-250w. Thru HWinfo I found that the VRAM chips were the culprit. During consistent gameplay the chips hover around 110C and the card's power limit throttles.

I'm currently using aluminum heatsinks and aftermarket thermal pads (which are significantly better than stock thermal pads, but idk how much better and they are ~1yr old) I was thinking maybe I need to go with copper heat sinks for the VRAM chips, but even still, due to the proximity to the die the heatsinks can't fully cover the chips themselves. My other thought is maybe I forgo using the pads on the chips and just adhere the aluminum heatsinks with the MX-4 arctic silver I used for the GPU die, but idk how well it will reliably hold the heat sinks on.

Side note: I'm actually still using the original backplate from the 3090 FE to cool the hot components on the back. Those are also using the aftermarket thermal pads I put on before, but they have pretty much the same cooling situation as before the AIO cooler mod.

Any advice would be appreciated, I just want to drop VRAM temps for sanity and to finally get the massive headroom from chilling my die down.

alpine dawn
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Remove the stock backplate and apply heatsinks directly to the backside components. Add an axial fan to stir air around the sinks.

light warren
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I have a fan on the bracket already (noctua 92mm). but you think its the backplate chips that are the outliers in cooling?

alpine dawn
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The backplate is another barrier to cooling. Remove it and apply heatsinks directly to the memory modules and other heat-generating components.

light warren
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like the ones on the die side look like this

20230103_140404.png
alpine dawn
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You need LARGER sinks on those memory modules.

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Choke and VRM sinks are not going to cut it.

light warren
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I only have up to those black fingers for height

alpine dawn
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Ehh that looks like a bit much for that setup. It wasn't designed for that. You might be better off with an EK block.

light warren
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well, say I didn't want to buy and ek block, could copper heatsinks/ better pads actually lower the temperatures

alpine dawn
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Potentially but perhaps not sufficiently.

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Look, all you need is the EK block, a small pump res, and a radiator to go with it. Not even that complicated of a setup.

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Corsair has a pump-res that mounts up to a 120mm fan position.

light warren
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my guy, I'm not buying an ek block

alpine dawn
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Well then you're going to suffer from stuttering memory on this setup, "my guy".

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If you want custom on a 3090, an AIO mod isn't going to cut it.

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Especially not an AIO mod as dated as that NZXT kit.

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You can make do with the Corsair XG7 waterblock and using some larger-profile heatsinks on the back of the card. That will cut your cost significantly.

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Soft tubing, six fittings, and you're done.

light warren
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My tubing and wiring is already tight as it is and this would make it much harder to fit. Doing this would basically involve throwing out all the cooling I have bought, and modded. I'm fine with the slight performance bump I have right now along with the massive noise decrease over stock. I'm just looking for a way to maybe get the VRAM slightly cooler or I'll just keep it as is because it still does better than stock.

alpine dawn
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Not going to be easy. The NZXT kit was not designed for this dense of a board. Maybe it would work on one of the AIBs.

light warren
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I mean, its running right now

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Thank you for your service btw, respect for being in the marines

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I'll probably wait a bit, and if it really bothers me in my games, I'll buy some copper heatsinks of near the same size, maybe wider (roughly twice as conductive as aluminum according to science) and apply some higher conductivity thermal pads/paste and see if that alleviates the issue

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next time though, I'll probably just get a water block

lean dust
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maybe something like this?

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https://www.youtube.com/watch?v=f8f6ZHCPVpw

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light warren
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hmm, maybe i could use them to allow better VRAM -> Heatsink heat flow, but I would still need a way to adhere them to the card, while also not compromising the heat conduction