RV790: Why is there so much conflicting information?

[Game_boy]

All of the following have been mentioned on tech rumour sites like this one. Some are more plausible, but can anyone decipher this:

1. What IS it?

- A tweaked 55nm process so that it's RV770 but at higher core clocks?
- A tweaked 55nm process so that it's RV770 but with more shader cores?
- A new 55nm revision of RV770 with higher IPC?
- A straight shrink of RV770 to 40nm
- A shrink of RV770 to 40nm with more shader cores?
- A cost-saving revision that will have no impact on performance?

Fudzilla says 40nm, but a lot of credible sources say it is deliberately 55nm due to problems with large 40nm cards for both AMD and Nvidia. Some say a 40nm version is coming later; some say it'll wait until R8xx.

2. How fast is it?

- Core Clock: 750, 850, 900MHz or 1GHz?
- Memory Clock: 900 or 975MHz?
- Memory Type: "Old" or "New" GDDR5 revision? 1GB or 2GB?
- Has the IPC been improved? If so, is it +5% or +30%?

3. What is it called?

- RV775? RV775XT? RV790?
- HD4890? HD4995? HD5xxx?

4. When is it being launched?

- April 6th? Or "sometime after RV740"?

[rambaldi]

Last I heard Fudzilla said it was 55 nm as well, I think it was in the stuff they posted friday

[fwoot]

this card should do pretty well in Australia if it comes out somewhere in April which in coincidentally the same month when people pretty much all around the country will receive their $900 from our governments latest stimulus package that's right everyone i'm doing whats right by the country by buying this card... i'm very patriotic   

[JSK]

There is a bunch of conflicting info because Faud is wrong.  Bookmark this and check back in a month or so.  This is not a new chip.  Count it.  Better speeds and price however are a reality.