Rare 2800+ AEP4AR: CG Clawhammer???

Hello!

I've just received a new boxed desktop A64 2800+. Initially I was looking for a CG Newcastle core (the AX ones) instead of the crippled CO Clawhammer (AP)

Well, the code of this one ends with AR (ADA2800AEP4AR) so in theory it should be a CG Clawhammer with half the cache enabled, shouldn't it?

The thing is that I've seen ZERO references to these cores, supposedly there are not 512KB CG Clawhammer cores, only TRUE Newcastles are CG (apart from 1024KB AR Clawhammers of course)... In other words, all 512KB chips I've read about were CG Newcastles (AX) or CO Clawhammers (AP) but not CG Claws.

Week of production is 29/2004, so it is relatively new...

What do you think about this CPU? I can't test it yet till my DFI arrives next week...

Thanks in advance.

Welcome to forums.

Yes, they're rare, but 512k CG Clawhammers do exist. I've only heard of one other one from yours, but they are in AMD's documentation.

Should OC slightly worse than a NC, but only slightly. Perhaps better than a few.

Thank you for your reply (and your welcome, of course )

Let's hope the chip turns out nice. As soon as the DFI board arrives next week I'll post initial results.

In the meantime, if anyone has some more info, it would be welcome

hello
i kind of new here

i think i also got the same rare chip you all are saying
is it ture that this chip is really that rare??

when i do the test, both program say i have diff core
but, i got a strong feeling is that, the one i have now is AMD64 2800+ Clawhammers with L2 - 512k CG at 1.8ghz

But is it true also, is that there is another AMD64 2800+ Clawhammers with L2 - 1MB CG but run at 1.6ghz?
coz, i remember i read it on AMD's documentation(Chapter 3...Page 20)
Or is it just only for Mobile A64 only??


i do some search, i found some info Here

Desktop A64 754
2800+: ADA2800AEP4AP 1.5V (SH7 C0 rev, F48h) <- ClawHammer, 512 KB L2, 1.8 GHz, x9 (512 KB L2 "disabled")
2800+: ADA2800AEP4AR 1.5V (SH7 CG rev, F4Ah) <- ClawHammer, 512 KB L2, 1.8 GHz, x9 (512 KB L2 "disabled")
2800+: ADA2800AEP4AX 1.5V (DH7 CG rev, FC0h) <- NewCastle, 512 KB L2, 1.8 GHz, x9

From here, i have few question
Is there any diff between these three??( more oc, stable etc)
Is there a way to re-enable the 512 KB L2 "disabled"


Thanks

I have the 3000+ CH w/ CG revision........512KB 1/2 disabled.

Desktop A64 754
...
2800+: ADA2800AEP4AR 1.5V (SH7 CG rev, F4Ah) <- ClawHammer, 512 KB L2, 1.8 GHz, x9 (512 KB L2 "disabled")
3000+: ADA3000AEP4AR 1.5V (SH7 CG rev, F4Ah) <- ClawHammer, 512 KB L2, 2.0 GHz, x10 (512 KB L2 "disabled")
3200+: ADA3200AEP5AR 1.5V (SH7 CG rev, F4Ah) <- ClawHammer, 1 MB L2, 2.0 GHz, x10
3400+: ADA3400AEP5AR 1.5V (SH7 CG rev, F4Ah) <- ClawHammer, 1 MB L2, 2.2 GHz, x11
3700+: ADA3700AEP5AR 1.5V (SH7 CG rev, F4Ah) <- ClawHammer, 1 MB L2, 2.4 GHz, x12

2800+: ADA2800AEP4AX 1.5V (DH7 CG rev, FC0h) <- NewCastle, 512 KB L2, 1.8 GHz, x9
3000+: ADA3000AEP4AX 1.5V (DH7 CG rev, FC0h) <- NewCastle, 512 KB L2, 2.0 GHz, x10
3200+: ADA3200AEP4AX 1.5V (DH7 CG rev, FC0h) <- NewCastle, 512 KB L2, 2.2 GHz, x11
3400+: ADA3400AEP4AX 1.5V (DH7 CG rev, FC0h) <- NewCastle, 512 KB L2, 2.4 GHz, x12


A64 CPU Models, OPN code, PR/frequency rating


Among the 754 512 KB L2 A64, I would get the NewCastle.


But since the debut of the 90 nm 939, I would get a 90 nm 939 3000+/3200+ instead of 754 for building new systems.

According to AMD, the only released 512KB CG is the ADA3000AEP4AP (A64 3000+). Neither the ADA2800AEP4AP or ADA2800AEP4AR are official. However, there is an ADA3400AEP4AR documented, but not seen for sale anywhere. There was also a AMD2700BQX4AR that was never released (got replaced by the AMD2700BQX4AX).

Finally, there is one other known 2800+, the ADAAA2800ACN5. This is a pre-production B0 CPU, it's age showing by the unusual positioning of the "AA" part definition (another example of this form is the OSADA240CCO5, a pre-release Opteron). But you'd be a bit bummed if you got this one, as it only runs at 1600MHz

That said, you have almost certainly got a SH7-CG there FengYun.

Thanks for the reply
after reading your post, i seen to understand more about the type of AMD64 2800+
I still got lot more to learn and understand about the new Amd64,
at the same time it really seen like both the ADA2800AEP4AP or ADA2800AEP4AR are not even official documented anywhere else

Look like a got myself here a rare chip Not really sure is it a good chip i got here?
can some one share some view?



well, if given a choise, which 1 will you go for
1) 2800+: ADA2800AEP4AX 1.5V (DH7 CG rev, FC0h) <- NewCastle, 512 KB L2, 1.8 GHz, x9
Or
2) 2800+: ADA2800AEP4AP 1.5V (SH7 C0 rev, F48h) <- ClawHammer, 512 KB L2, 1.8 GHz, x9 (512 KB L2 "disabled")
2800+: ADA2800AEP4AR 1.5V (SH7 CG rev, F4Ah) <- ClawHammer, 512 KB L2, 1.8 GHz, x9 (512 KB L2 "disabled")

what are the diff the above 2 chips( NewCastle vs ClawHammer - A64 2800), performance, stable, OC etc etc......
or each 3 chip over all performance.....
hmmm, i do wounder is it true that there is no way to mob / re-enable the other L2 - 512 kBtyes

Thanks

The 2nd two chips both have 1MB of L2 cache, but half of it is disabled. the F48h chip is a C0 stepping, the F4Ah chip is CG stepping which overclocks a lot better than the C0. then there's the FC0h, it only has a total of 512KB of L2 cache, and it overclocks somewhat better than the clawhammers do.

From what iv seen they dont oc very well