we don't use swim on this site. it's pointless because anyone who's reading your post can clearly see that you just ordered 2 g's of MDPV and have some experience with a product called "pump it", but you're curious about how MDPV will compare to this product.
we can't tell you with any degree of certainty what chemical is in that particular product. It could contain MDPV, but it is highly unlikely it is 100% MDPV. many producers of these products will mix the active with some inactive cuts. this explains why you have been able to consume 500mg within a night. it could contain any number of other chemicals, so if you want to get some sort of idea of what is in it I suggest looking at the effects profiles of various RC stimulants and comparing them to what you have experienced.
from what I could uncover via a 20 second google search, Pump-It is known to contain methylhexanamine, aka DMAA. I've experienced DMAA containing products in the past and MDPV is a much more recreational drug. overdoses of DMAA cause horrendous headaches and nausea. I suggest not treating MDPV like you did Pump It or you could very easily wind up in the hospital or worse. responsible dosing with MDPV requires an accurate scale, or at the very least an inaccurate scale (.1 gram increments) to confirm the initial weight of what you've been sent, and then proceeding to measure out doses volumetrically. One way to do this is weigh out the 2 grams, make sure they are actually 2 grams, then using a syringe dissolve in water. I am not an mdpv user so I don't know the actual solubility, but you might need an oral syringe to dissolve your entire supply. then you would suck the solution back up into the syringe and using a simple mathmatical formula such as 2ml for 2 grams = 100mg per 1 unit of liquid, squirt out your individual doses. either letting them dry out or sucking them back up in another syringe (with no needle!) for rectal administration. even so this can be difficult because if you squirt out 1 unit you will have 100mg of MDPV, which is still too high of a dose to work with.
bottom line is before you start messing with this drug you should buy an accurate scale. even one that measures to the hundredth of a gram is dodgy because you have a +/- of up to 5mg.
hope I helped.
and to Done Juan. I don't want to tell her what to do but I am concerned by what she is posting. numerous posts in a row, talk of bugs crawling all over her apartment (this is a bad sign whether the bugs are real or imagined). I have no idea what this drug is doing to her physically, but mentally, in my opinion, she is not well.