Does that fit?

1.Where do I get the current to the graphics card.

You place a cable that is connected to any good power supply from the power supply to the graphics card. For most models, this is either 6 or 8 pin cables. For the models RTX 4070ti, 4080, 4090 12high Power. To use this, an ATX 3.0 power supply is recommended as you save adapters here.

2.How do I connect the pc to the current so where do I get the cable.

The cable is supplied with the power supply (standard cold plug) and is simply attached to socket and PC power supply.

3. Fits the 4070 ti on the mother board Asus rog Strix B550-A gaming.

Yes. Any graphics card that has the same connection as the motherboard can be combined. This is a standard PCIeX16 slot.

4.And the return to the housing of lian li o11 dynamic mini

Yes. Despite the “Mini” the housing is for up to ATX housing. There should also be enough room for the graphics card, but it would have to be checked after a precise model selection.

Five. Which cpu fits best?

The most difficult question is this. For the first time you need to know that the price/performance ratio of an AMD Radeon RX7900XTX is the better choice than the RTX 4070ti, but also this card is very good, and about at the level of an RTX3090(ti). The Board (Asus ROG B550 A-Gaming is a board for AMD CPUs of the last generation, since AMD is now set to AM5. I’d like you to combine the CPU with a 4070ti to one Ryzen 7800X3D Rats. Alternatively, Ryzen 5 7500F quite favorable. However, you need an AM5 board for both. On the one hand (if you want to know) ASUS B650 A-Gaming Wifithe Gigabyte Aorus AX Ice and the MSI B650 Edge Wifi. But I would also compile a suitable configuration so that you don’t get any compatibility problems.

I hope that solves your questions 🙂 LG