AMD's Kaveri APUs are dependent on system memory. The easiest way to explain this dependency is by thinking of the GPU on the Kaveri APU as a graphics card, but with one significant difference ? on its own it has no video memory. The video memory the Kaveri GPU uses is your system memory, or RAM. In the case of Kaveri APUs the CPU and GPU parts both share the system memory resources equally as part of the hUMA process, though the GPU is more performance-dependent on this memory bandwidth than the CPU is. In effect what this means is that as you increase your system memory frequency Kaveri APUs have more bandwidth available to them and thus perform better.Taking your system RAM from 1866MHz to 2400MHz has the same effect on the Kaveri GPU as would overclocking a DDR3 graphics card by the same amount.AMD has really pushed the benefits of memory scaling for Kaveri and as I?ve already alluded to above these benefits are primarily realised by applications and processes than use the GPU. So this memory scaling article will be focusing largely on the gains in GPU related performance, though we will consider CPU performance and power consumption as well.