Using concurrent high-density EEG and different high-speed fMRI methods, we investigate safety of RF heating, effect on image SNR and assess EEG data quality. RF related electrode heating during a 30-minute scan did not exceed 1.0o C with any of the pulse sequences. No significant differences in the EEG data quality were found between high-speed fMRI and conventional EPI (p=0.78). Residual ballistocardiographic artifacts resulted in 58% of EEG data being rated as poor quality. This study demonstrates that high-density EEG can be safely implemented in conjunction with high-speed fMRI and that high-speed fMRI does not adversely affect EEG data quality.