There is no minimum GRE test score, however applicants admitted to the CS graduate program usually have high quantitative GRE scores and a math background that includes study through some discrete math. If you feel that your test scores are not valid indicators of your ability, you should explain your concerns in your statement of purpose.
You must report your scores to the CS Department Supplement by the application deadline: December 15, 2018 (23:59 CST)
In addition to self-reporting your scores to the CS Department Supplement, you must request that ETS send your official test scores to UT-Austin. These scores will be uploaded to your MyStatus page and will be available for later review by the admissions committee. Official score reports may arrive to UT-Austin after the Dec. 15th deadline, however please note that late scores may delay the final review of your application. If you have questions about the receipt of your official GRE scores, please contact the Graduate and International Admissions Center (GIAC) at firstname.lastname@example.org.