Can you give me advice?

[Rephrenothey]

Hi. I want buy 10x GPU server. Can you give me advice?
1. What characteristic should the server have (RAM)?
2. Which video card should I choose?

I use MetaMask 26600 and Bitcoin/Litecoin wallet.dat 11300 algorithm

[Chick3nman]

Buying a system like this is not so simple these days as many of the economical options have been forced out of the market in most places. While it is still possible through some distributors, you will pay a significant premium.

1. Characteristics: You are looking for something with 1-2 modern CPUs, but they don't need to be ultra fast or powerful. With 10 GPUs you really only need 10-20 CPU cores total to be perfectly fine, which even lower end server CPU options should cover. Epycs will probably be the better deal here. As far as RAM, you should expect to have the same amount of system RAM as you have combined VRAM, which I will get to in the video card section. Other than that, you will want some decent storage, couple of SATA SSDs should be plenty fast enough and plenty of storage.

2. Video cards: This is where everything gets complicated. Nvidia and AMD have moved away from allowing consumer GPUs in 2 slot blower form factors, which means the existing GeForce or other consumer cards rarely are able to be placed into server chassis, especially 10 of them. This will probably be the biggest hurdle and may kill this project. The only "easy" option for this will be to go with the professional cards, like Nvidia's Quadros. The downside is that the Quadros are either the same or even slower for hashcat vs the GeForce cards, while being sometimes as much as 10x as expensive. You will be getting a fraction of the performance per dollar with those cards, and the entire system will jump from being maybe 20-30k$ to being 80k$+ very quickly. This is not something I would typically recommend anyone do but if you need it for a business and that cost isn't out of your price range then it may be acceptable.

As far as the modes you've selected, I have some additional bad news. Both of those algorithms are rather slow and difficult to attack. A large GPU computing system will certainly speed them up, but the recovery potential will remain very low regardless of your GPU power. It will come down to your attack setup in any case and how effective/efficient it is for the specific password you are targeting. If you can't improve the attack, adding more GPU power will likely not make as big of a difference as you may be hoping as you will go from "impossibly slow" to "slightly less impossible slow", not "slow" to "fast". Unfortunately, these formats are designed to be secure and do a decent enough job at achieving that.