Is there need to have ram on 1525? I mean, I can't mine some algos without ram directly on board?
Thank you
There are currently NO bitstreams that utilize the memory. There are plans for it to be utilized in the future for some operations. However, you can buy the memory at that time on your own if you decide you want to. We will be releasing a memory compatibility list so you know exactly what to buy.
Taking into consideration planned ZCOIN August fork to MTP, I wouldn't think about board without RAM.