speed bump said:
Most DQT chips arent fatbodies, I had a gig of the normal stuff and it was fairly mediocore in the overclocking department. The Fatbodies are DQT BT-3 and DQT BT-37 with the BT-37s being better overclockers. Every other DQT is just normal Micron that in my experiance will do around 4,3,3 at around 400.
Man at $130 a set I really should have picked one of those sets up. I remember a year ago trying to buy fatbodies used for more than that.
With all due respects, I believe that some of what you've posted needs clarification. I will not debate your personal experience, but with respect to the information on Micron chips, let me offer the following. The main point is that all D9DQTs are in fact, fatbody chips and that it does not come in two speed ratings.
For starters, here is a link to a pic of a D9DQW fatbody chip.
http://www.xtremesystems.org/forums/showpost.php?p=1392989&postcount=1417
...note that it is in fact a "fatbody" chip, just like the DQT pic linked below.
http://www.xtremesystems.org/forums/showpost.php?p=1761294&postcount=59
The general designation for Micron DDR2 is "D9", whether fatbodies or not, as you can see from this linked listing, there are many D9 listed, some of which are fatbodies, many which are not. All D9DQT and D9DQW, however, are fatbodies...period. With that said, let me be clear...not all fatbodies were good clockers, only these two are the ones of interest to overclockers.
I am not aware of a D9DQT chip that was not a fatbody and if you have evidence to the contrary (such as pics), then I would certainly appreciate you posting it. When you follow the Micron link further down in this post for the D9DQT you will also see that only one chip, the BT-3 (MT47H64M8BT-3:A), is displayed. It does not come in a BT-37 rating as was indicated above...it is the D9DQW fatbody that has the BT-37 designation (MT47H64M8BT-37E:A).
Continuing...
http://ramlist.ath.cx/ddr2/
As you can see from the above linked list, all modules listed with fatbodies were made with either the original D9DQW [(BT-37 Rev A or 266MHz rated or 1000/3.7 = approx 267) and used in ram like the OCZ PC4200 EB (3-2-2-8) and Mushkin PC4200 (3-2-2)], or the higher binned D9DQT [(BT-3 Rev A, or 333MHz rated or 1000/3 = 333) and used in most of the Corsair 5400/8000UL series, as well as numerous other highly regarded modules]. As documented by that list (most of the higher speed rated modules use the DQT version of the chip), the "DQT" is the higher clocking of the two, not the DQW, and easily breaks the 1GHz threshhold and beyond at still relatively tight timings. The D9DQW is more likely to just hit on either side of the DDR2-1000 clock speed. Both are capable of relatively tight timings at the higher clock speeds.
From Micron themselves...type in either one of the chips for the complete coding and see what pops up.
D9DQT (BT-3) or
D9DQW (BT-37E)
http://www.micron.com/support/designsupport/tools/fbga/decoder#
Hopefully this will help clear up some of the confusion about the Micron fatbody chips, however, the thread that I linked a single post to above (pic of D9DQT) has some good info on the fatbody chips, as well as a few others which I've linked below. Much of the information that I've posted above originates from these threads, as well as other sources, and personal experiences as well.
Source of pic:
http://www.xtremesystems.org/forums/showthread.php?t=116949
Other threads:
http://www.xtremesystems.org/forums/showthread.php?t=94017
http://www.xtremesystems.org/forums/showthread.php?t=77442
http://www.xtremesystems.org/forums/showthread.php?t=90973
This is a long post and I apologize for the length. I realize that I've duplicated some of the info, but I felt it was worth repeating. Should you find factual errors, please point them out and I will be most happy to correct them.
Edit:
One last thing is worth repeating...all Micron DDR2 is designated as "D9" in their part numbering scheme therefore to say, as the title states "Good old D9 results" when referring to Micron fatbody chips is similar to saying good old Winbond when in fact you are intending to refer to BH-5 and not CH-5 or one of the other Winbond chips. The term D9 is generic, although many people use it interchangeably with fatbody chips. Today's top choices, the D9GMH and the D9DKX could also be referred to as D9, and I have even read reviews that refer to them this way. It can lead to confusion as to just what is being talked about when described in such general terms as D9.
Sentential has always made a big deal about this (to a fault I used to think), but now I have to admit that he has a valid point. When referring to fatbodies, I think that it is beneficial to be clear and identify it as either DQT or DQW.
