It is possible to run ESX 3.5 inside Workstation 6.5. However it depends on setting up the VM that will run ESX right and the hardware you are running Workstation on.
Ive found it works best on Intel processors (recent ones, pentium 4, core 2 duo and xeon), AMD tends to be impossibly slow to boot up after installing (athlon x2). Its all down to the processor supporting virtualization, and it may need turning on in your BIOS. Look for the AMD-V or INTEL-VT setting and turn it on.
Ok so why would you want to run ESX 3.5 on Workstation 6.5? Maybe you want to test ESX, maybe you want to do a demo on a laptop or maybe you just want to have a play around for the first time.
I will show you the steps of setting this up inside Workstation 6.5 and the correct settings. Bare in mind though you might be able to install ESX, but depending on your processor you might have speed problems when booting it.
1. Open Workstation and create a new virtual machine. Choose the Custom (advanced) type. Next...