What do the system requirements call for in the emulators you tried using?
If they call out for a Core 2 Duo minimum, then this is what you will want minimum. Additionally I am thinking you want to have at least 2GB RAM available as the emulator will want 512MB to 1GB of RAM. If you have a Core 2 Duo system to use and that meets the requirements of the emulator then I'd install 4GB RAM myself and not go with just 2GB.
Even if your motherboard supported a better Pentium 4 HT processor, I have doubts it would be enough to run the emulator at a speed that is enjoyable. Many of the motherboards for Pentium 4 processors Max out at either 1GB or 2GB RAM depending on how old the board is and MFR specs.
The Pentium 4 HT Processors are cheapest cost in the 2.8Ghz and 3.0Ghz if your system supports them and they come in both Socket 478 and 775. The Extreme Edition Pentium 4 HT processors are costly and all for a few more hundred Mhz of CPU speed and lots more heat and power consumption. I picked up a Pentium 4 HT 3.0Ghz Socket 478 for $9.99 on ebay with free shipping 2 years ago for a friend that needed more processing power than the 2.6Ghz single-core Pentium 4 that he had. It made quite the difference, BUT he wasnt running emulators like your typing to run for android apps.
I use Andyroid emulator but on Windows 7 and 10 and my slowest system is a AMD A8-5545m 2.7Ghz Quadcore these days since I retired all my older dual and single core systems to the dry attic.
