Radeon HD 2600
Mainstream products with 120 stream processors, GDDR4 support and AVIVO HD with UVD, an 128-bit memory ring bus width [23] and 4-phase digital PWM. Neither the GDDR3 nor GDDR4 reference PCIe designs require additional power connectors, however AGP XT variants will require additional power through either molex or 6pin power connectors.[24] Official claims are that the Radeon HD 2600 series consumes as little as 45 W of power[citation needed].
Radeon HD 2400
Low-end products with 40 stream processors with AVIVO HD and UVD, not implemented with a ring bus memory interface, and a 64-bit memory bus width [23]. The official PCB design implements only a passive cooling heatsink instead of a fan, and official claims of power consumption are as little as 35 W. The RV610 core used in Radeon HD 2400 series has 16 KB unified vertex/texture cache from dedicated vertex cache and L1/L2 texture cache.