Well Hashaltcoin is definitely not a scam, I have an F1+ myself. I think they're the best known fpga miner there is right now. Not sure why you're saying scam except for the roi speculation which of course will drop like a sack of bricks.

Anyone using ryzen 9 3900x to mine?

i built three rigs.

gear seems pretty good.

No you just need dual channel. Its all about timinings...hitting 13.5k with customs timings on shitty ram, and over 14k with decent ram, with total system power around 130 watts at the wall and 65c CPU temps.

Evga two fan.    120mm 65c

Corsair two fan 140mm 58c

Look for sales .

The Corsair is impressive.

I use ram clocked to 2666 it does 3000 stock

Both builds use 32gb ram.

With the advent of ASICs, CPU and FPGA mining has been a thing of the past. Most crypto enthusiasts mine altcoins with their GPUs, while others mine Bitcoin with ASICs. Every year, we see new ASIC hardware with more powerful hashrate and lower energy consumption. On the other hand, GPUs are becoming better over time, making them relevant in the crypto mining industry.

As for FPGAs, I haven't heard much about them (in the Blockchain industry) ever since ASICs took over crypto land. I've seen new FPGAs on sale across the web, but I'm not sure if it's still worth mining crypto with an FPGA these days. Because if you could still make money mining with an FPGA, then I believe that it's a great alternative to existing ASICs and GPUs.

Any thoughts?

keep your all eth coin trolls, the moment asics are banned from mining eth then eth price will be back to $ 1400 or higher maybe around $3000.

Right now small miners are kinda out of option if they use video rigs , even if they have powerful ones as the mining difficulty grows and the electricity bills remain the same so they need to make further upgrades or move to asics or dedicated hashing clouds which in my opinion are not profitable.
If you have more than 150+ gpus with nice hashing power then you can talk about some nice incomes monthly but the costs to buy a gpu for mining is kinda big and if you buy them from amazon they probable have been used on the same thing as buying new gpus can lead to expensive costs and the return of the investment takes a little longer now due to markets being down.

At this point why would anybody buy a rx 5700XT over a regular 5700 if they almost produce the same hashrate?

Yes its pretty crazy how unfair the mining game is towards the ASICs. Basically most of my old RX series rigs were all RX 470 GPUs. And each rig used about 750 Watts, give or take. However each GPU peaked at 30MH/s, usually a little less. So my total hashrate was 180MH/s or so.

So if you compare it to the ASIC, its basically almost 3 times more efficient per watt than a GPU. Now this is why something like ProgPOW is important. Because if it had the same efficientcy then it would be fair and I wouldn't complain. However just like with BTC, the efficiencies will always increase and before we know it there will be ASICs which are 10 times more efficient, then 100 times, then 1000 times and eventually GPU miners will be completely out. This is pretty much to what happened with Bitcoin in 2012.

Did manufacturer send you a new GPU or send you 5700?

Did you try the store from where you bought it?