GTE vs GTE-2 ?

[nocash]

The japanese wikipedia Playstation page http://www.google.com/url?q=http://ja.w ... 25A9%259F) is mentioning SCPH-7000 and later PSX/PSone models to have an improved GTE, called "GTE-2". Is that something known in english speaking world?
I am wondering what kind of improvements they are talking about... accuracy, speed, power consumption, extra features...?

[AmiDog]

Interesting. I haven't been able to detect any kind of difference between an SCPH-1002 unit and SCPH-7002 one in terms of GTE behavior. But the CPUID has changed from 1 to 2, perhaps that's what they mean?

[nocash]

Uh, well, maybe, if they are considering the changed CPUID as being an "improvement" of the GTE hardware.

Checking the japanese wiki history... that GTE-2 was originally mentioned on 09 Feb 2007 by "222.14.87.95" (not helpful), alongsides with +11,614 bytes of new text. And on 26 Oct 2009, "Monster-T" changed the GTE/GTE-2 info to table format (but maybe that was just cosmetic reformatting without knowing anything about the technical details).
Anyways, since it does exist since 2007, I do really hope that somebody in japan does know what it means, and that it isn't just some strange myth.