Again, no such CPU exists.
"1400" would indicate Intel 1st generation Core series (Nephalem architecture), but the CPU numbering on 1st generation didn't consist of 4 numbers, instead only 3 numbers.
And Intel didn't start using F-suffix until 9th generation (Coffee Lake refresh architecture).
Point is, you have to be exact and punctual when you're giving out hardware specifications.
E.g, the CPU what i have, is: i5-6600K (6th gen, Skylake architecture).
If i were to mistype it to e.g "i5-660", it means completely another CPU (1st gen, Clarkdale architecture).
Intel 14th gen F-suffix CPUs are:
i3-14100F
i5-14400F
i5-14490F
i7-14700F
i7-14790F
i9-14900F
So, which of the 6x CPUs it is? Since knowing exactly the CPU would allow me to tell how well it fits when paired with RTX 4060 Ti. But without knowing exactly what you have, there is huge difference between i3-14100F and i9-14900F.
750W power supply (80+ Gold, peak 800W)
Yeah.... as expected.
Thing with prebuilt PCs is, that PSU is often cheaped out in them, to save money. And most people care little, if any, about the PSU in their PC. All that they may care about is wattage rating and that's it.
Thing is, since PSU powers everything, it is
the most important component inside the PC.
And you'd never want to cheap out on PSU. The lower the PSU's build quality is - the higher the change of PSU going "boom", releasing magic smoke and frying everything it is connected to (aka your whole PC).
With prebuilt PCs, it is easy to tell when PSU in them is cheaped out and isn't a good quality unit. Namely, only wattage rating is listed.
Since when PSU would be good/great quality unit, like Seasonic PRIME TX-650 (80+ Titanium) or Corsair AXi-1600 (80+ Titanium) or Super Flower Leadex VII XG 850W (80+ Gold), the PSUs name would be listed there fully as well.
Since it would be another selling point. Just like CPU, GPU and OS are, which are listed in great detail.
In same sense, if prebuilt PC makers would use the same ruse with other components, PC specs would look like so:
CPU - 8 cores
RAM - 16 GB
GPU - 8 GB VRAM
MoBo - 600-series
PSU - 750W
Would you buy the PC when all the specs are listed as i just did?
If not, then why not?
Btw, the PC you have, PSU isn't the only unknown component. So are SSD, HDD, RAM and even CPU cooler. No make or model of those are listed. But since PSU is the most important component inside the PC, i'm only caring about what PSU you have. Having cheap SSD/HDD or RAM will not kill your PC. But having cheap PSU will.
To know what PSU you exactly have, only option is to open up the back panel of the PC case, unscrew the PSU from PC case and pull it out enough, so that you can see the label on the PSU. Take a pic of the PSU label (where all kinds of watts and amps are seen) and upload it to the net. E.g
www.imgur.com and share the pic here.
Until it isn't confirmed what PSU you have, PSU is considered crap quality (aka guilty until proven innocent). Crap quality PSUs are ticking time bombs and can blow up at any given moment.
Edit:
To showcase you reputable prebuilt PC brand, here's Starforge and for this example, i took one of their random prebuilts, Naviagtor Pro,
specs:
https://starforgesystems.com/products/navigator-pro
If you look at the specs, almost immediately you can see that: "Power Supply - MSI MPG A750GL PCIe 5".
Like i said, when PSU is good, there's no point in hiding what PSU the PC has.