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Glad that we could help you. Have fun!

As people before me have said, yes, a Micro ATX motherboard will fit in an ATX case. However, as for if an ASRock B360M-HDV will fit into a Dell Precision T5400, I can't answer that, as the motherboard may a custom form factor that doesn't quite work with ATX and Micro ATX motherboards.

https://pcpartpicker.com/list/MMctNQ

Yes, unless the system doesn't work properly, you don't need to update the BIOS. The extra 4MB of L3 cache won't provide a massive performance increase in, well, about anything.

Minus clock speeds, the Ryzen 3 1200 and Ryzen 3 1300X are the exact same CPU. In theory, with the same voltage and clock speed, they should have the same level of stability and temperatures.

Yeah, just get a 1080 Ti. New, you can find one for around 650 USD. Used, you can find one for around 550 USD. Stick with that 1080 Ti for a while, and then when you feel comfortable, upgrade to a newer and more powerful GPU.

Thank you for responding respectfully. As for what 1080 TI I would recommend, I don't have a preference. Just get the cheapest one, unless you want to get into intense overclocking and/or are paranoid about temperatures. As for the rest, you provided pretty good explanations for why you chose them. And trust me, I've seen worse part lists from experienced builders, haha. Glad I could provide feedback.

If you feel that you could use that money for something more important, do that. If not, go with the X370 motherboard.

Welcome to the LTT forum! You said you will never use SLI. In that case, go with B450. However, I must ask: how much more is the X370 motherboard? If a lot, B450. If not, X370.

Welcome to the LTT forum! Why are you buying a 7600K in 2018, and pairing it with a non-overclocking friendly motherboard? Here, try this: https://pcpartpicker.com/list/D4LByX

As far as I am aware, no, nobody has benchmarked the 2080 Ti in an eGPU situation.

$3800 USD? That's an awful lot of money to have lying around for a gaming PC, especially one that can handle 1080P at 144 FPS at the highest settings. But, I tried my best. CPU: i7-8700K. The 8086K is just an ever so slightly faster 8700K. Even at this price point, it would be a waste of money, especially if you're considering overclocking. CPU Cooler: Since you chose an air cooler, I won't challenge you on that. I, however, would get the NH-D15, with your budget. Motherboard: Any nice Z370 motherboard will do. Memory: RAM speeds and latency aren't super important with Intel. I would recommend a 2 x 8, 3200MHz, DDR4 memory kit. Any latency, brand, or extra features is fine. HDD: ...unless you need a lot of storage, we don't need to add one. SSD: Here's a luxury that you can afford: a 1, or even 2, TB M.2 drive. GPU: Money is not a concern for you, so get a 2080 TI. Case: Any case works. Just make sure all the parts fit, and that it looks good enough to you. PSU: Something that is at least 550W, 80+ Silver, and fully modular. If you wanted to go all out, without going insane, go for a 850W, 80+ Gold, fully modular PSU.

Oh, alright. In that case, yes, just get a H310 motherboard, and enjoy your i3-8100. Glad that I could help!

Yeah, please don't combine, say, an H310 motherboard and an 8700K. They're compatible, its just a ridiculous combination. At that point, it would be a better idea to get an 8600K and Z370 motherboard, for example.