What hardware do the Google servers use?

What kind of hardware does Google use?

• Exclusively Intel processors? Always?
• Xeons, Duos, or Quads?
• Intel chipsets?
• motherboards - Intel, Gigabyte, MSI?
• What kind and build of RAM?
• What physical memory configuration (single large capacity modules or multiple smaller capacity modules)?
• What brand of HDD (I know they used to buy almost all the brands - from their disk failure report)?
• Were they able to implement a single voltage power supply for their servers (like they had been pushing for a long time to Intel)?

Any other trivia you have or would like to share?

Lots of these:

Servers

Take a look at Google platform.