> Intel Xeon - X3220 @2.40 GHz (4 core?)
> Intel Core 2 Duo T7700 - 800 MHz Bus
I'm confused -- what am I missing here? You've listed two different CPUs. Which of these is actually in your PC? Or are you talking about 2 PCs?
What Tony said is a good guide for CPUs -- check the PassMark score to do a quick comparison. The two CPUs you listed are quite slow these days.
The machine you linked has a good "mid-range" CPU. Anything between 4000-5000 on the PassMark is kinda your normal work PC these days.
I'm not sure why people are so concerned about a PC with a DP and not an HDMI port. DP is newer and is commonly replacing HDMI as the default for most new PCs. Many gamers now run DP-to-DP for their new monitors and such. And, heck, a DP-to-HDMI cable is literally like $10 shipped at Amazon.
So, it not having an HDMI port is not a big deal to me. In fact, if I had to choose if it had just one HDMI or just one DP, I'd probably pick DP.
So, it has VGA and a DP -- so you can do dual monitors with it pretty easily.
Don't get me wrong -- it's not some top of the line gaming PC by any stretch. But it'd beat the heck out of your old PC probably.
I've got a pile of Core 2 Duo PCs sitting in a closet here just waiting for someone to haul them off to recycling for me. They are pretty much worthless to me. But I'd happily take that i5 PC and use it as a workstation and everyone would be happy. So, for $200, it's a pretty good step up, IMO. (I'd rather it was a Dell OptiPlex instead of an HP Compaq, but that's another issue.)
EDIT: One last thing... These days, I don't like PCs without USB3 connections. So, I'd probably pass on that HP just for that reason along. For $300, I think you should be able to find a refurb with similar or better specs that has a couple USB3 ports.