I just finished doing some pretty intensive research on the X2 3800+
Very interesting last couple hours it was...
There are actually two different X2 3800+ out there.
One is an E4 Manchester.
The other is a less seen E6 Toledo with half the cache disabled. Most likely they are 4400+ that had half the cache fail, & were down-binned.
If you look on AMD' site, you will see that for each Manchester X2, there are two versions, the E4, & the E6.
Now more than likely, the E6 4200+ is a cache-failed 4400+, & the E6 4600+ is a cache-failed 4800+.
That why the E6 3800+ is so interesting to me.
As of the present, there is no 4000+, so the E6 3800+ has to be a cache-failed 4400+. The only downside of that is that is may also be a speed-failed 4400+, which isn't so good for us OCers.
However, it seems both E4 & E6 3800+ are hitting very nice OCs.
I think the OCing potential is higher with the E6 3800+ myself, since i'm assuming they were designed to be 4400+, which should mean a slightly higher OC.
Either way though, both E4 & E6 3800+ seem to hit 2.4GHz at the lowest, which means a free upgrade to 4600+
Here's the links to some great info on the X2s & the different revisions:
http://balusc.xs4all.nl/Ned/har-cpu-amd-k9.php
On AMD's compare site, select X2, & more details will appear -
http://www.amdcompare.com/us-en/desktop/Default.aspx
Here's what i copied onto notepad for my own reference:
More detailed info from AMD.com:
Processor AMD Athlon 64 X2 Dual-Core
Model 3800+
Ordering P/N (Tray) ADA3800DAA5CD
Ordering P/N (PIB) ADA3800BVBOX
Stepping E6 - Toledo (half cache disabled)
AMD Athlon 64 X2 Dual-Core Details
Processor AMD Athlon 64 X2 Dual-Core
Model 3800+
Ordering P/N (Tray) ADA3800DKA5BV
Ordering P/N (PIB) ADA3800BVBOX
Stepping E4 - Manchester
Detailed info from The BalusC Server:
X2 3800+ Toledo
OEM: ADA3800DAA5CD
BOXED: ADA3800CDBOX
X2 3800+ Manchester
OEM: ADA3800DAA5BV
BOXED: ADA3800BVBOX