Previously, I've used scripts to successfully gather this information. However, I did a quick search and it looks like VMWare replaced a majority of their functionality with one cmdlet! This is great for audit and management purposes.
Get-VMHostHardware
This cmdlet was introduced in PowerCLI 6.0 R2 and retrieves the following information:
VMHost
Manufacturer
Model
SerialNumber
AssetTag
BiosVersion
CpuModel
CpuCount
CpuCoreCountTotal
MhzPerCpu
MemorySlotCount
MemoryModules
PowerSupplies
NicCount
Example Output against one ESXi host:
Get-VMHostHardware -vmhost MyHost.MyDomain.com | fl
All I did was connect to all of our vCenter servers in PowerCLI and run the following one-liner. This got me nearly all the information I needed!
Get-VMHost | Get-VMHostHardware -SkipAllSslCertificateChecks | Export-Csv D:\VMHostHardware.csv