Yeah, I couldn't tell whether or not you were serious. When I first got my X1600 PRO over 6 years ago I tried my hand at a little overclocking (without modding) and found that it didn't OC well at all. Mine was the reference card from ATI and I remember I could only go about 100 MHz on the core and 50 MHz on the memory before it would become unstable. With that said, I don't really put much value into synthetic benchmarks as I do in real-world application and gaming performance. I've seen too many people who flaunt their 3dmark or whatever scores as a measure of their "e-wang."
I'm probably going to just pop in the 5450 and test it myself to see if it really is any better. Probably gonna run Half-Life 2: Lost Coast benchmark, CS:S stress test, and Doom 3 built-in benchmark and compare with the x1600. Those are the most demanding games I run on this system anyway so they should be a good gauge.