Something I noted on the new one is the label on the side of it notes it supplies 35A to the 5v rail. For anyone having this issue, I'd opne your case and read what it supplies to the 5v section. My old one was 30A.
If I'm guessing correctly, I bought my case back when I bought an AMD 1400, and all I had for cards were the GF 4400. I used the onboard sound and ethernet of the mobo.
3 months ago roughly I bought an amd xp 2100 and never gave the PS a thought.
A month ago I decided to buy a SB Audigy 2. Ever since, various games have been crashing constantly. I had a few lockups/crashes here and there before getting this, but nothing that seemed more than OS issues. But my guess is the Audigy2 requires just enough current from the 5v rail to pull power away from the CPU or GPU, and that was why the system would crash.
With the new supply having 35A for the 5v components, it's running smoother. So anyone having this problem should double check, even the guy with the 450w supply. Just because it's labeled 450 doesn't mean it reall puts that much out, or that it puts what you need where you need it
regards,
RogueOne