This article has a collection of links to great articles that help you learn more about Dynamic Memory.
Part 1: Dynamic Memory announcement. This blog announces the new Hyper-V Dynamic Memory in Hyper-V R2 SP1. It also discussed the explicit requirements that we received from our customers. http://blogs.technet.com/virtualization/archive/2010/03/18/dynamic-memory-coming-to-hyper-v.aspx
Part 2: Capacity Planning from a Memory Standpoint. This blog discusses the difficulties behind the deceptively simple question, “how much memory does this workload require?” Examines what issues our customers face with regard to memory capacity planning and why. http://blogs.technet.com/virtualization/archive/2010/03/25/dynamic-memory-coming-to-hyper-v-part-2.aspx
Part 3: Page Sharing. A deep dive into the importance of the TLB, large memory pages, how page sharing works, SuperFetch and more. If you’re looking for the reasons why we haven’t invested in Page Sharing this is the blog. http://blogs.technet.com/virtualization/archive/2010/04/07/dynamic-memory-coming-to-hyper-v-part-3.aspx
Part 4: Page Sharing Follow-Up. Questions answered about Page Sharing and ASLR and other factors to its efficacy. http://blogs.technet.com/b/virtualization/archive/2010/04/21/dynamic-memory-coming-to-hyper-v-part-4.aspx
Part 5: Second Level Paging. What it is, why you really want to avoid this in a virtualized environment and the performance impact it can have. http://blogs.technet.com/b/virtualization/archive/2010/05/20/dynamic-memory-coming-to-hyper-v-part-5.aspx
Part 6: Hyper-V Dynamic Memory. What it is, what each of the per virtual machine settings do in depth and how this all ties together with our customer requirements. http://blogs.technet.com/b/virtualization/archive/2010/07/12/dynamic-memory-coming-to-hyper-v-part-6.aspx
Hyper-V Dynamic Memory Density. An in depth test of Hyper-V Dynamic Memory easily achieving 40% greater density. http://blogs.technet.com/b/virtualization/archive/2010/11/08/hyper-v-dynamic-memory-test-for-vdi-density.aspx
And while we're on the subject of Dynamic Memory, BrianMadden.com recently posted a great article on the upcoming feature of Dynamic Memory for Windows 2008 R2 Service Pack 1. The article focuses particularly on the impact for Virtual Desktop Infrastructure (VDI) deployments. For both reasons I recommend taking a moment to read the post. You may find yourself adopting SP1 sooner than you expected.
A closer look at the new "Dynamic Memory" feature of Hyper-V: is it worth it for VDI? :