To be perfectly honest, the assertion that the Radeon X1650 XT runs on a core called RV560 is really quite fallacious in the extreme. RV560 is, in fact, the exact same RV570 core which we've seen power Radeon X1950 PRO boards, albeit with some functionality disabled.

Thus, we find this core sporting the same 80 nanometre manufacturing process and eight vertex shader units. Where it loses out to the Radeon X1950 PRO is with regard to pixel shader units and ROPs - One quad of pixel pipelines is disabled for 'RV560', giving it twenty-four pixel shader units against thirty-six on RV570, and just eight texturing units against twelve in the core's big brother. Four ROPs have also been switched off here, leaving us again with eight rather than twelve.