It's not an April Fools joke. Kipper2k usually supplies the vampire 2 with speed grade 8 FPGAs. The Turbo version will be supplied with speed grade 6 FPGAs, these cost a lot more though. I believe Majsta has used grade 6 so far. A turbo version of the core will be required to take advantage of the faster FPGA and the increase is not huge (about 20% has been mentioned.)
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