Honestly, don't know yet - sitting from here, you could have practically anything! Only thing that's going to yield information is to crack that baby open and look what's inside.[/quotemsg]
Well I did that when I first got it, and couldn't tell much from it since I'm not super tech savvy. What I've gathered so far (which isn't anything really):
Processor: Intel pentium 4. I couldn't tell much from looking at the actual processor since it's hard to read, but this is what the sticker on the front says.
RAM: It has 4 skinny slots, and 2 512mb sticks inside. But again, I'm not tech savvy enough to know what kind of new RAM would fit into the slots
Motherboard: No idea[/quotemsg]
Is there a make and model on the front? May help narrow it down a little.
First the good news: with a GB of RAM, you probably have a later Pentium 4, with an LGA 775 socket.
The bad news: even though it's also LGA 775, it's very likely that the chipset on that motherboard will not allow you to get to the top of the Core 2 Quad food chain. You're probably only going to be able to upgrade to the lower half of the Core 2 Duos with the motherboard (though I can't say for sure as I don't know exactly what your motherboard is - making educated guesses). Your best hope here is that it's a newer (relatively speaking) LGA 775 motherboard slumming it with a P4.
Your motherboard almost certainly supports DDR2 RAM, but the RAM will be more expensive than modern DDR3 RAM (which you will not be able to use) since nobody uses it anymore and it's only for older computers.
The age of the motherboard will also possibly limit your ability to add a GPU. The Pentium 4s were coming out at a time in which we were seeing AGP transition to PCI-E.
I'll cross my fingers! If your motherboard is a little newer than I fear, you could possibly have some upgrade path on the cheap, though not to something somebody would build new today.