What makes you conclude that he has the newer CPUs and/or PCI-E as OP has not mentioned anything of the sort. The issue is we don't know what CPU's OP is using.
If OP had issues with newer GPU-z, he should have tried the version I proposed in my first post in this thread (but I did recall it with a small error, I checked and I did use 0.7.2 and not 0.7.6 I mentioned earlier). It worked for me almost everytime up to this point and I tested* it even on Slot-1 platform (*with proper GPU/chipset drivers installed).
My comment you quoted specificly though, was directed at Naki which commented to my previous post.
I simply continued to explain my thoughts on the matter.
It's NOT a direct response to what OP wrote in this topic, but those are things I wanted to share in general ("GPU-z + WinXP support"). Not sure why you thought it was directed at OP, even when it was posted right after Naki...
Side note : I tested Titan X(M) on XP (.ini ID mod, I made the change myself) and it worked fine in both benchmarks, and few games that I checked (I did NOT tested DOS/Win98 era stuff or games with specific issues on newer cards).