The SNR-performance of a low-field (0.26T) Tabletop-MRI-system was experimentally compared to a high-field (3T) clinical scanner. The SNR of simple FID sequences were evaluated for RF-units with identical coil and sample geometries as well as T/R-switch designs. The SNR was calculated from time signals and put into perspective to compute the relative SNR-performance of the Tabletop-system which was measured at 11.3%. Additional compensations for several differing experimental conditions were carried out. The full comparison suggests limiting factors in the equivalent measurement in the clinical scanner which can result in more SNR loss than expected.