Hey there, Ive used a couple different options but ended up with the below. I have an EVGA 3080 ftw3 ultra, and the cooler is not nicely rectangular. Therefore, solutions screwing into expansion slots DID NOT work even remotely well. While your GPU may work with those... I don't like them. Do you know how your GPU will be shaped in 7 years? I highly doubt it'll be any thinner!
GLOTRENDS Graphics Card GPU Brace Support, Universal VGA Graphics Card Holder, Anodized Aerospace Aluminum https://www.amazon.com/dp/B08KVXY359/ref=cm_sw_r_apan_glt_i_VSWNA92VZBSM6Y67S6E6?_encoding=UTF8&psc=1
GLOTRENDS Graphics Card GPU Brace Support, Universal VGA Graphics Card Holder, Anodized Aerospace Aluminum,DIY Adjustable Single Slot Support for Computer Cases (Black) https://www.amazon.com/dp/B08KVXY359/ref=cm_sw_r_cp_api_glt_fabc_H5DCRA5JJ3N4HSEZMDQV?_encoding=UTF8&psc=1
GLOTRENDS Graphics Card GPU Brace Support, Universal VGA Graphics Card Holder, Anodized Aerospace Aluminum,DIY Adjustable Single Slot Support for Computer Cases (Black) https://www.amazon.com/dp/B08KVXY359/ref=cm_sw_r_cp_api_glt_fabc_H5DCRA5JJ3N4HSEZMDQV?_encoding=UTF8&psc=1
Hard to tell from the pic but it looks like you might have plugged both connectors from a single PCIe cable into the GPU. You'll want to run 2 cables to this card, especially if you are going to push the performance by overclocking it. At a very high OC my STRIX 1080ti pulls spikes of up to 300-400 watts, 75 come from the slot so the other 200-300w are being pulled through the cables. A single PCIe cable is usually rated around or under 200w draw so you'll want to have both cables plugged in especially when OCing the card.
At default I believe it draws up to 250ish watts (and probably spikes higher) so with 75 from the slot you are *probably* okay but it will likely perform a little more stable with 2 cables.
If you have both cables plugged in just ignore me, like I said hard to tell from the pic
Also I will second that you should have both expansion slot screws attached instead of one, and I'd suggest picking up a $10-15 support off of amazon to prevent GPU sag. The tower ones work better than the L shaped expansion slot ones, the one I linked is basically what I'm using (found a red one to match my case accents).
GLOTRENDS Graphics Card GPU Brace Support, Universal VGA Graphics Card Holder, Anodized Aerospace Aluminum,DIY Adjustable Single Slot Support for Computer Cases (Black) https://www.amazon.ca/dp/B08KVXY359/ref=cm_sw_r_cp_api_glt_i_TSXMZS0B2MZZ576F0QAF?_encoding=UTF8&psc=1
I’ve been happy with this brace(I’m in Canada)
I use something like this one: https://www.amazon.com/dp/B08KVXY359/
You can see the card sagging on the picture. Won‘t be a problem within the next weeks or months. But it could turn in to a problem later.
I have the same card and case and mine sagged just like yours. I bought one of these to prop up the card: https://www.amazon.com/gp/product/B08KVXY359/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
$9, solid metal. It was much higher quality than I expected when I ordered it.