We are developing large pixel count, fast (≥100kHz) and continuously sampling soft X-ray (SXR) arrays for the diagnosis of MHD and turbulent fluctuations in MFE experiments. The arrays are based on efficient scintillators, high throughput multi-clad fiber optics, and multi-channel light amplification and integration. Compared to conventional X-ray diode arrays, such systems can provide vastly increased spatial coverage (e.g. 2-D tangential imaging), access to difficult locations and potentially circumvent the neutron damage encountered with typical X-ray diodes. A prototype eight-channel array is being built using columnar CsI:Tl deposited on a fiber optic faceplate as an SXR converter and a multi-anode PMT and APD as photoamplifiers. Columnar CsI:Tl was found to have conversion efficiency superior to that of amorphous depositions. The overall system efficiency is measured using laboratory SXR sources, while the time response and signal-to-noise performance are evaluated by recording MHD activity from the Current Drive Experiment Upgrade (CDX-U) and the National Spherical Torus Experiment (NSTX) at PPPL.