vcjester
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   I fashioned this backplate out of an led heatsink I found on Amazon. Just search 140mm x 300mm heatsink. Had to do a lot of hand machining to get clearance for screws, and needed to countersink the holes so the factory screws would work. I used small nylon washers to make standoffs too. Super glued them together, then sanded them down until they measured the same as the factory standoffs. Then glued them to the backplate, and visually checked for component clearance using a backlight. Next I cut a 1mm Der8aur pad to fit inside the factory cooler mounting bracket, and trimmed away holes for the large caps. Then cut another 1mm pad to lay over the top of that, and fit between the memory modules. Left the memory pads in place. I slid the power limit and temp sliders to the max, (factory stock bios), punched in a conservative offset, and set the fans at 100%. Furmark was set at 5120x1440, and ran for 6 mins for each run. Any differences in power usage, clock speed and voltage, was done by the bios algorithm. Up to 6C drop in temps.
post edited by vcjester - 2020/12/04 04:14:34
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rjohnson11
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Re: Crafted a replacement backplate out of a heatsink for my 3090 FTW3 Ultra.
2020/12/04 04:22:05
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I like the design myself.
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Hoggle
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Re: Crafted a replacement backplate out of a heatsink for my 3090 FTW3 Ultra.
2020/12/04 04:32:13
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I agree that I like the original heat sink but glad that yours works. I would keep the original around though in case you need to RMA.
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SeanDude05
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Re: Crafted a replacement backplate out of a heatsink for my 3090 FTW3 Ultra.
2020/12/04 05:28:23
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 EVGA RTX 3080 FTW3 ULTRA + Hybrid Kit
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vcjester
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Re: Crafted a replacement backplate out of a heatsink for my 3090 FTW3 Ultra.
2020/12/26 06:32:23
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Update: Finally got my hands on a 5950, and the AM4 mobo I use had the memory slots just a tiny bit closer to the gpu, so I had to trim several fins for clearance. Also, as you can see in the photo, I have a small section of fin removed, for access to the gpu lock clip. If I hadn't thought of removing that bit, the gpu might be permanently mounted to the motherboard.
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Dyezak
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Re: Crafted a replacement backplate out of a heatsink for my 3090 FTW3 Ultra.
2020/12/26 07:43:31
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Google home aluminum anodization. Time to wrap up your side project with a crisp finish that makes it look good.
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wwxww
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Re: Crafted a replacement backplate out of a heatsink for my 3090 FTW3 Ultra.
2020/12/26 07:53:18
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Nice.  Looks crisp. I bet she runs.
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kandiflippin
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Re: Crafted a replacement backplate out of a heatsink for my 3090 FTW3 Ultra.
2021/04/03 18:11:23
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Can you by chance update us with what your memory junction temps ended up being after a run? It would be great to have a comparison with the stock plate vs your heat sink but I understand that’s a big hassle swapping between the two.
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vcjester
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Re: Crafted a replacement backplate out of a heatsink for my 3090 FTW3 Ultra.
2021/04/03 20:51:08
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Sorry, there is no going back to stock. The factory thermal pads basically crumble apart when you pull the backplate off. There was no access to thermal junction temps when I originally tested it either.
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rustyjn
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Re: Crafted a replacement backplate out of a heatsink for my 3090 FTW3 Ultra.
2021/05/16 16:31:34
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vcjester
Sorry, there is no going back to stock. The factory thermal pads basically crumble apart when you pull the backplate off. There was no access to thermal junction temps when I originally tested it either.
Hey, I really like what you’ve done here. I work in a machine shop so this wouldn’t be a problem for me to do. I would love to get more pics though, specifically of what you referring to here; “ Next I cut a 1mm Der8aur pad to fit inside the factory cooler mounting bracket, and trimmed away holes for the large caps. Then cut another 1mm pad to lay over the top of that, and fit between the memory modules. Left the memory pads in place.”
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vcjester
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Re: Crafted a replacement backplate out of a heatsink for my 3090 FTW3 Ultra.
2021/05/16 18:11:26
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Here are 2 pics I scribbled on from the internet. Layer one goes inside the tension plate, and layer 2 goes over layer 1, tension plate, etc. Just keep it inside the vram modules. I also ended up replacing the vram pads with 2mm pads. I ended up slapping a fan on it, directly over the back of the chip, and dropped an additional 18 C while mining with +1500 on the meme. So a total of 24 C drop vs factory. https://ibb.co/XSgzJJbhttps://ibb.co/M6WCZqs
post edited by vcjester - 2021/05/16 18:13:58
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Joeybenevento
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Re: Crafted a replacement backplate out of a heatsink for my 3090 FTW3 Ultra.
2021/05/16 18:55:51
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thats awesome! great work!
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rustyjn
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Re: Crafted a replacement backplate out of a heatsink for my 3090 FTW3 Ultra.
2021/05/16 19:50:38
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vcjester
Here are 2 pics I scribbled on from the internet.
Layer one goes inside the tension plate, and layer 2 goes over layer 1, tension plate, etc. Just keep it inside the vram modules.
I also ended up replacing the vram pads with 2mm pads.
I ended up slapping a fan on it, directly over the back of the chip, and dropped an additional 18 C while mining with +1500 on the meme. So a total of 24 C drop vs factory.
https://ibb.co/XSgzJJb
https://ibb.co/M6WCZqs
Wow! Thanks! So do you know at this point with the fan what your actual vram temp Is? Also, got a pic with that fan and the specs?
post edited by rustyjn - 2021/05/16 20:11:57
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jakesaile
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Re: Crafted a replacement backplate out of a heatsink for my 3090 FTW3 Ultra.
2021/05/16 21:29:57
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vcjester
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Re: Crafted a replacement backplate out of a heatsink for my 3090 FTW3 Ultra.
2021/05/17 01:53:41
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jakesaile
Looking good 🙂
I'm away 300 miles from home, but luckily I have team viewer setup, and a security cam aimed at an ambient thermometer. LOL 84C Mem junction temp 54 and 55C shown in ICX 21.6C ambient 334 watts being used by gpu
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