AMD has just announced two new quad-core 45nm Athlon II X4 processors, the sub-$100 Athlon X4 620, and the X4 630.The new processors form a part of an affordable mainstream desktop platform that also includes AMD’s 785G chipset that comes with ATI Radeon HD 4200 graphics for powering HD video playback on Windows 7.

The X4 620 is a 2.6GHz processor, while the X4 630 features a faster 2.8GHz clock. Both CPUs come with a 2MB L2 cache and support for DDR2 and DDR3 memory. Aside from the X4 620 apparently targeting a below-$100 price point, further pricing and availability info isn’t available yet.