I'll admit that I experienced a relentless FRAGing problem with an X2.3 Lite on a v1.0 XBOX -- I've done nearly 100 XBOX installs (with 100% success rate) and this was the first time I had ever had issues with a FRAG. I went for the wire harness install at first, nothing but FRAGs (checked voltages, etc., everything panned out perfectly - the FRAG was a definite mystery). So, I then desoldered the LPC bus, and did a pin header install (this is the way I usually install chips, except on 1.0s because I don't like to waste my time desoldering). Still endless fragging. I finally got pissed and threw in one of my spare X2.2 Pro modchips, sure enough it worked like a champ, used SAME D0 wire and pin header.
BTW, for those of you getting FRAGs, that USUALLY means D0 is fine; you can generally narrow down a FRAG problem to bad LPC soldering (for soldering noobs) or a bad/non-existent BIOS (for example, if you install a factory X2.2 Lite on a v1.4 or above, you'll FRAG because the Cromwell FlashBIOS doesn't recognize the Focus video encoder). BTW, if you have a v1.4 or v1.5 XBOX, you must use X2_4979 or EvoxM7, or you'll FRAG. I'm definitely advanced at soldering, so when I get FRAG problems I immediately assume it's a BIOS issue, and 100% of the time I've been correct with that assumption -- in fact, this isn't really an assumption, it's plain fact in my case.
The X2.3 problem bothered the shit out of me, so I proceeded to install it into a v1.3 XBOX that I was doing (I had 6 to do tonight - damn holidays), sure enough it worked without a hitch in the v1.3. Why the X2.3 did not work in the v1.0 I do not know (it was my 3rd X2.3 Lite install, FIRST problem). At any rate, there may be an issue with the Cromwell 2.2x Dev BIOS, but from what I've seen here others have gotten these chips working fine on v1.0s.