help me about MSI RX 6400

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Svet

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You should check this with your mainboard/PC vendor.
 

citay

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Your PC is not from MSI, so normally you would have to ask at HP Compaq, but i will try to help.

Looking at what graphics cards they offered for that PC, they mostly offered cards with a a power draw of about 20W:
Radeon HD 6350: ~20W
Radeon HD 7450: ~20W
NVIDIA NVS 300: ~18W
NVIDIA NVS 310: ~20W
NVIDIA GeForce GT 630: ~25W

This is of course due to the low wattage rating of the PSU, but we have some more stumbling blocks:
The PCIe slots are officially restricted to 10W power draw maximum (probably can do at least double), plus the main first slot is physically x16, but electrically only PCIe 3.0 x4.
The other PCIe slot is PCIe 2.0 x1 ...
Furthermore, only low profile cards fit.

So now we look at the card you are thinking about, MSI Radeon RX 6400 Aero ITX 4G.
Power draw: 53W, more than twice what HP Compaq was comfortable with, probably putting too much load on the PSU (recommended PSU by MSI is 350W or more).
Low profile PCB: No, won't fit.
Draws the whole 53W via PCIe slot only: Yes, too much.
Also, RX 6400 depends on the motherboard providing PCIe 4.0, because the GPU is restricted to x4 lanes. When using PCIe 3.0 x4, the performance gets much worse again.

So overall this is the wrong pick for your system. You need a card with a TDP around 20-25W, low-profile. This leaves a couple NVIDIA GT 720 and GT 1030 cards, for example the MSI GeForce GT 1030 2GHD4 LP OC. But although the card is low-profile, i'm not sure it comes with an extra low-profile slot bracket.

Overall, i would not particularly bother getting a graphics card for this system. Even the GT 1030 (which is very slow) still costs around 100 EUR/USD at the moment.
The price/performance is just not there. This is the downside of such a compact system, you can hardly upgrade it. It's better to get a full-sized PC so you can upgrade properly.
 
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