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ErikaT

Thx for reply so fast.,,

I believe that the xeon processor is out of range of my budget :)

But nice to know-..
is xeon the older one too,, better than fx. the Intel I7 or AMD ryzan 7.. I think that my budget is better for the older xeon or the new Intel or AMD.. what can you recommend when we talk not over 700-800$... Thx

You should first define "best". This could be:

1.) fastest cpu regardless of price
2.) best output in relation to price (wcg points per day / price)
3.) best output in relation to total cost of ownership (including price for cpu, other hardware and electricity for a couple of years)

Depending on what is "best" for you, the answer will be completely different.

1.) Would be certainly be a recent XEON with the maximum number of cores you can find.
2.) would be any system you can get for free or very cheap, just let many of them crunch if they are too slow, just don't cry if you see your electricity bill
3.) A 4-core Intel i7 with Hyperthreading should be a good compromise between price and energy efficiency. Depending on your cost for electricity a relatively new one or a somewhat older (cheaper, but somewhat less energy efficient) should do it. Also XEON engineering samples are considered to be a good option, not too old ones as they are less energy efficient. AMD Ryzen also seems to be a good option.

Regarding energy efficiency: lower clock speed is normally better. For example I deactivated TurboBoost on my i7-3770, so it runs with 3.4 GHz instead of 3.7 GHz. After calculation I found the added cost for rising electricity consumption not worth the higher speed, as power usage rises overproportionally with clock speed.
XEONs with many cores but relatively low clock speed are very energy efficient for the same reason.

For WCG, if you're on a budget that doesn't allow for expensive Xeons, the next best in my opinion is the Ryzen 7. Clock-for-clock it's around the same performance as a Haswell, but you get double the number of cores. You may want to consider the cost of electricity too - in such case go for the 1700 (non-X) and run it in the 3.0-3.3GHz range where it's super energy efficient.