AMD-Technical Infos and docs
http://www.amd.com/us-en/Processors/TechnicalResources/0,,30_182,00.html

DOCs to AMD 64
http://www.amd.com/us-en/Processors/DevelopWithAMD/0,,30_2252_875_7044,00.html

Intel-Manuals
http://www.intel.com/products/processor/manuals/index.htm

IA-32 Intel® Architecture Optimization Reference Manual
http://www.intel.com/design/processor/manuals/248966.pdf

IA-32 Intel® Architecture Software Developer's Manual Volume 1: Basic Architecture
http://developer.intel.com/design/processor/manuals/253665.pdf

Intel® Architecture Software Developer's Manual, Volume 2A: Instruction Set Reference, A-M
http://developer.intel.com/design/processor/manuals/253666.pdf

Multimedia API Library Reference
http://www.intel.com/design/network/manuals/telecom/hmp15lin/pdffiles/multimedia_api_v1.pdf

Intel Desktop Chipset Manuals
http://www.intel.com/products/desktop/chipsets/index.htm?iid=PCG+devleftnav&

Find the technical Specs (Temp., Voltage etc.) for your Intel CPU:
http://processorfinder.intel.com/List.aspx?ProcFam=2558&sSpec=&OrdCode=