I have just bought an HP microserver and I have seen another bundle being sold with a ESXi 4.1 Hypervisor (2GB USB) and I have been looking all over google trying to see what that is as the picture shows it as a low profile PCI card. Here is a link to the server bundle
ESXi 4.1 Hypervisor (2GB USB) but I will be interested in buying just the ESXi 4.1 Hypervisor is its sold separately to run my VMware on it if it helps in providing a more efficient service and also frees up system resources.