Hello
muddysoap. In direct answer to your question: Yes, I personally think you'd be fine placing the 2080 Ti on your existing power supply. However, that is not the upgrade that I would go for, and I say that as an owner of a RTX 2080 Ti. For starters, I do not believe that you can purchase a new 2080 Ti's in June of 2024, therefore I assume that you're considering a used model. Were it me, I'd instead upgrade to an AMD RX 6800. Besides it having the same 250 watt TDP as the 2080 Ti, it's approximately 15% faster in rasterization graphics and possesses 16GB of VRAM, versus 11 for the 2080 Ti. My only caution about the GPU that I've linked, is that it's a long card; dimensions: 13.38" x 5.12" x 2.05". But if it'll fit into your case, then I think it would make for a very shrewd purchase.
Also, I'd upgrade that Ryzen 7 2700X to a Ryzen 7 5700X3D, and would place a quality single tower air cooler on it (they offer it in RGB and non-RGB variants). And the flash drive is for updating the motherboard BIOS, in anticipation of upgrading the CPU, and potential file backups. These are the upgrades that I would personally do.
Also, don't forget to sell your GPU and CPU afterwards, and use the proceeds toward another upgrade or Steam game purchases.
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XFX Speedster SWFT319 ,Radeon™ RX 6800 Core Gaming Graphics Card with 16GB GDDR6, AMD RDNA™ 2 (RX-68XLAQFD9)
$360.58
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AMD Ryzen 7 5700X3D 8-Core, 16-Thread Desktop Processor
$204.99
* important * contact Asus and verify that their latest BIOS supports this CPU. I'm reasonably sure that it does, but it wouldn't hurt you to be absolutely certain.
https://www.amazon.com/dp/B0CQ4H4H7X/
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Thermalright BA120 ARGB CPU Air Cooler, 6 Heat Pipes, TL-C12CG-S PWM Quiet Fan CPU Cooler with S-FDB Bearing, for AMD AM4/AM5 Intel LGA1700/1150/1151/1200
$22.90
https://www.amazon.com/dp/B09YY72PYN
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SanDisk 128GB Ultra USB 3.0 Flash Drive - SDCZ48-128G-GAM46, Black
$12.99
https://www.amazon.com/dp/B081QSJNRJ
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** Addendum **
I should mention that you don't really
need an X3D chip for a RX 6800. The Ryzen 7 5700X3D is a nice thing, but you could certainly get by with just upgrading to a Ryzen 5 5600 sticking with your existing cooler, to save some money. But whether buying the 5700X3D ($200) or the Ryzen 5 5600 ($117), I would absolutely upgrade to one of them. I wouldn't even consider staying on the 2700X. These are my thoughts on the matter.
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AMD Ryzen 5 5600 6-Core, 12-Thread Unlocked Desktop Processor with Wraith Stealth Cooler
$116.99
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** notes **
https://www.techpowerup.com/gpu-specs/geforce-rtx-2080-ti.c3305
Experience next-level performance and personalization options with the ROG STRIX X370-F GAMING, powered by AMD® Ryzen™ AM4 processors. Unlock full calibration and customization with 5-Way Optimization featuring Fan Xpert 4, AURA Sync RGB lighting and 3D printing mounts. Onboard NVMe M.2 and...
rog.asus.com
View: https://www.youtube.com/watch?v=MU-jUtrfANA