Actually these blocks are here to replace the circle design, a poll on block design was held by EK and plain beat circles with clear also beating frosted, in both cases by a landslide. As a result the circles/frosted design was scrapped for HD7990/Titan water blocks and all future water blocks. The old CPU blocks will remain in production for a while as their predecessors did (easier in this case as they are essentially the same block), however no new blocks are going to be created using the circle design.