I just Googled your PC. Introduction date 27 November 2005. What year are we now? Time flies and I hate to say it but that box is an antique. Athlon 64 2.2 means squat, it's a single core about the same as my old P4 2.8. Mine has 2 gigs ram and will render 5 RT's in 15-20 sec, a tad faster than yours but who cares. More memory will probably help you a bit but still, time to donate that Compaq if rendering times are your concern. A new quad core with 4 gigs or more of ram will render 5 RT's in 4 or 5 seconds according to several people here.
I just bought a brand new custom built to my order Athlon Phenom 6 core, a hot Gigabit motherboard, 1TB HD, 4 gigs ram, Win7 Ultimate 64 bit and other goodies for $575. I'll report when I start running Biab with it, I'm still setting it up and copying all my stuff from the other machine and I've yet to install my Emu 1820M. Not looking forward to that one but from what I've read it should install ok.
The downside to upgrading after having a machine for 5 years is deciding what's important, do I really care about this or that piece of software, where's the registration number/passwords, don't forget to copy all the bookmarks and emails, all kinds of stuff like that. I've copied a ton to my external drive but still, that old box has so many different things on it.

Bob

Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.