This is already screwing up the rankings, like this GPU on air and ~ 300 mhz less beating SS: http://hwbot.org/submission/3826281_niuulh_gpupi___1b_geforce_gtx_970_24sec_0ms/
My suggestion would be to make this two different rankings, like CB11.5 and 15. My last GPUpi for CPU 1B run (and I've done many!) took about 30$ worth of LN2 and several hours. Let's not make people rebench that just because a new version came out. New hardware releases already do that often enough.
@richba5tard@Leeghoofd What are your thoughts? IMO GPUpi runs on enough different hardware that making two rankings wouldn't split it too much.