The Radeon HD 3400 series was based on the codenamed RV620 GPU , packed 181 million transistors on a 55 nm fabrication process .
The Radeon HD 3400 series was had 64 - bit memory bus width .
The Radeon HD 3400 series was based on the codenamed RV620 GPU , packed 181 million transistors on a 55 nm fabrication process , and had 64 - bit memory bus width .