Claim: Radeon R100 series had its first version which is the Radeon DDR which was a core speed of 183Mhz.
Evidence: The first versions of the Radeon (R100) were the Radeon DDR, available in Spring 2000 with 32 MB or 64 MB configurations; the 64 MB card had a slightly faster clock speed and added VIVO (video-in video-out) capability. The core speed was 183Mhz and the 5.5 Ns DDR SDRAM memory clock speed was 183 MHz DDR (366 MHz effective).