Make sure any PC you use to test the Windows 10 Technical Preview meets the minimum criteria. System requirements include a 1GHz or faster processor, 1GB of RAM for the 32-bit version and 2GB of RAM for the 64-bit version, and 16GB of free hard disk space.
It's likely that the tablet install, when released, will have a smaller footprint. Same with Win 8.1 - smaller on a tablet install than on a "traditional" device.
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