The armada 1573 is a laptop and you can't upgrade as I believe the cpu is wavesoldered to the motherboard. It's also highly unlikely that you'll find a new/replacement motherboard with a better processor. Even if you could, it would be cost prohibitive. You'd be better off searching through the refurbished/used laptops at pricewatch.com.

btw, here's technical support link at hp for the armada 1500 series