S.C. Code Ann. § 56-5-2940
A person who violates a provision of Section 56-5-2930 or 56-5-2933, upon conviction, entry of a plea of guilty or of nolo contendere, or forfeiture of bail must be punished:
(4) by imprisonment for not less than one year nor more than five years for a fourth offense or subsequent offense.
No part of the minimum sentences provided in this section may be suspended. The court may provide instead of service other sentences provided in this section. For a third or subsequent offense or for a violation of Section 56-5-2945 for great bodily injury, the service of the minimum sentence is mandatory. However, the judge may provide for the sentence to be served upon terms and conditions as he considers proper including, but not limited to, weekend service or nighttime service in any fashion he considers necessary.
The fine for a first offense may not be suspended. The court is prohibited from suspending a monetary fine below that of the next preceding minimum monetary fine.
For the purposes of this chapter any conviction, entry of a plea of guilty or of nolo contendere, or forfeiture of bail for the violation of any law or ordinance of this or any other state or any municipality of this or any other state that prohibits a person from operating a motor vehicle while under the influence of intoxicating liquor, drugs, or narcotics constitutes a prior offense for the purpose of any prosecution for any subsequent violation hereof. Only those violations which occurred within a period of ten years including and immediately preceding the date of the last violation constitute prior violations within the meaning of this section.
Upon imposition of a sentence of public service, the defendant may apply to the court to be allowed to perform his public service in his county of residence if he has been sentenced to public service in a county where he does not reside.
One hundred dollars of each fine imposed pursuant to this section must be placed by the Comptroller General into a special restricted account to be used by the Department of Public Safety for the Highway Patrol.
Two hundred dollars of the fine imposed pursuant to subsection (3) must be placed by the Comptroller General into a special restricted account to be used by the State Law Enforcement Division to offset the costs of administration of the datamaster, breath testing site video program, ignition interlock provisions, and toxicology laboratory.