Keeping in mind the end goal to make an accumulation the spammer needs just issue more than C - N transactions every second, where C is viable limit of the Network and N is the ordinary activity.
At present C= ~1.32 kB/s (~790kB/block) and N = ~0.67 kB/s (~400 kB/block), so a spammer needs to issue just ~0.65 kB/s (~390 kB/block) to begin and manage a build-up. (Note that the successful limit is not as much as the hypothetical 1.67 kB/s (1000 kB/block) on the grounds that there are many purge pieces.)
On the off chance that the piece measure constrain were lifted to 8 MB, keeping a similar level of discharge squares, C would be duplicated by 8, to C' = ~10.53 kB/s (6300 kB/block). Nonetheless, N would keep on increasing gradually, and a long time from now would even now presumably be under 2. At that point the aggressor would need to issue C' - N = 8.53 kB/s (5900 kB/block) to make and support an excess, which is 13 times what it needs today.