A Dutch supercomputer called ARTS that searches for Fast Radio Bursts (FRBs) may be at the base of the shortage of GTX 1080 Tis in The Netherlands, as it sports 200 of them (plus probably at least as many for replacement in case of defects).

Fast Radio Bursts (FRBs) are extremely bright flashes of radio light, that travel billions of light years to reach Earth. Discovered over a decade ago, their origin and nature are still largely a mystery. Because the flashes last only a fraction of a second, they are easy to miss and very difficult to observe. Therefore, only about 25 FRBs have been discovered so far.

That is now going to change with Apertif, the new wide-field cameras for ASTRON's radio telescope in Westerbork, the Netherlands. Apertif has the largest, most sensitive field of view of all radio telescopes in the world.

To find FRBs, Apertif needs to continuously make a high-speed movie of the radio sky, at 20.000 frames per second. This requires new, more powerful brains. "To form and process all those images, we need the computing power that only the fastest supercomputers in the world can produce", says Joeri van Leeuwen from ASTRON and the University of Amsterdam. "But we did not have such a computer yet. That’s why we designed and built this one ourselves."

Tweakers.net has a Dutch article about the speed it reaches (2 PFlops)

Numbers:
Data rate: 4Tbit/sec
Storage: 2 petabyte on 320 HDDs (*)
Speed: 20,000 8bit images per second

(*) because these can be written to continuously, whereas when SSDs are used, once these are full, write speed drops immediately to zero.
Also, the amount of SSDs one can add in a server is finite. Aside from some absurd/stupidly priced 60TB/16TB SSDs, the comparison was made between normally available hard drives and solid state drives. It was found that for maximum space, one HDD's space would need several SSDs. And since write speed isn't an issue (150MB/sec on average is enough), the choice was to add 320 HDDs.

Fun image: Seti would be jealous.

Not all of the 4Tbit/sec is stored. Pre-processing by 50 nodes cuts that down enormously.. These nodes consist of:
CPU: Dual Intel Xeon E5-2680v3 2.5 GHz (12 cores, HyperThreading disabled)
Memory: 256GB @ 2133 MHz
Disk: 2x 300GB 10Krpm SAS RAID
Network: 2x 1GbE, 2x 10GbE, 1x FDR InfiniBand
Part of which have 4 TESLA K40C GPUs.