AMD has announced the launch of a number of new Phenom-based CPU's. Among those introduced is the energy efficient quad-core Phenom X4 9100e. This processor uses AMD's Cool'n'Quiet 2.0 technology, and CoolCore tech. - which helps conserve power by dynamically turning on and off parts of the CPU depending on load. The X4 9100e also takes advantage of Independent Dynamic Core Tech., which allows independent frequency control for each core, which adjusts power consumption in relation to core usage. Additionally, AMD launched two tri-core CPU's - the X3 8400 and the X3 8600 - which can improve performance over dual-core CPU's in single threaded apps, and can also scale appropriately in multi-threaded apps like a quad-core CPU. The X3's can also provide increased performance in multitasking situations. Not to be outdone by Intel in the quad-core market, AMD has announced four quad-core CPU's - the X4 9550, X4 9650, and X4 9750, clocked at 2.2GHz, 2.3GHz, and 2.4GHz respectively. AMD is also continuing it's "Black Edition" tradition by offering the quad-core Phenom X4 9850 - clocked at 2.5GHz - with an unlocked multiplier. All four AMD quad-core Phenoms are "true quad-core", and are B3 stepping CPU's - meaning they do not carry the dreaded TLB bug. Unfortunately, the Phenom X3 8400 and 8600 - as well as the X4 9100e - are all B2 stepping CPU's and are carriers of the TLB bug.