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Article about A64 stepping

Originally posted by: Acanthus
Wouldnt this just be different cache sizes?

2000mhz + 1MB = 3200+
2200mhz + 512k = 3200+
Click to expand...

No, the newer stepping has some core improvements. The most outstanding one that I know about is the improvement of Cool n' Quiet. At the lowest speed the processor will now run at 1Ghz and still dissapate about 7w less heat because of less electrical leakage.

-Por
 
Originally posted by: PorBleemo
Originally posted by: Acanthus
Wouldnt this just be different cache sizes?

2000mhz + 1MB = 3200+
2200mhz + 512k = 3200+
Click to expand...

No, the newer stepping has some core improvements. The most outstanding one that I know about is the improvement of Cool n' Quiet. At the lowest speed the processor will now run at 1Ghz and still dissapate about 7w less heat because of less electrical leakage.

-Por
Click to expand...
I disagree, the most outstanding one to me is they are supossed to have some nice memory controller improvements.
 
The new "CG" stepping was announced months ago, although I guess it's just now showing up in places like Japan. Haven't been able to find any US vendor that sells it yet. The first announcements stressed the memory issue:

The new CG revision of AMD64 microprocessors resolves some issues with current 64-bit chips, e.g. enhances 2T DRAM timings to enable desktop customers to achieve higher density and/or higher speed memory and removes requirement for use of identical DIMMs for the 2nd and the 3rd DIMMs in 3-DIMM mainboards.
Click to expand...
link

The Inquirer is the first article I've seen which suggests there would be a MHZ difference in the CG chips. Not sure that's accurate, but time will tell.

Anyone looking for the new chip, here's some info:
To distinguish between the C0 and CG stepping, customers should pay attention to markings of the chips, where the last two letter stand for core revision (e.g., ADA FX51 CEP5AT, ADA 3200 AEP5AR, ADA 3200 AEP5AX). For the Athlon 64 processors AR and AX letters reflect improved CG core, in order to get revamped Athlon 64 FX ?CG? chips, customers should look for AT letters.
Click to expand...
link
 
Originally posted by: PorBleemo
Originally posted by: Acanthus
Wouldnt this just be different cache sizes?

2000mhz + 1MB = 3200+
2200mhz + 512k = 3200+
Click to expand...

No, the newer stepping has some core improvements. The most outstanding one that I know about is the improvement of Cool n' Quiet. At the lowest speed the processor will now run at 1Ghz and still dissapate about 7w less heat because of less electrical leakage.

-Por
Click to expand...

Hopefully these new cores leak into the mobile range too - at the moment, an Athlon64 3000+ clocks down to 800mhz at 1.1v releasing 15w of heat, which is still acceptable.
 
Originally posted by: KristopherKubicki
Yikes guys...

I wrote about this like a week ago almost:

http://www.anandtech.com/cpu/showdoc.html?i=2027

Kristopher
Click to expand...
Well now I'm confused. The article you link to seems to talk about the CO stepping. These have been out for a while I think. (CPU-Z identifies my 3000+ as a 'CO' 'Newcastle' -- I've had this cpu for well over a month now. In fact I bought it just shortly after the 3000+'s came out. Is CPU-Z giving me false info?) The CG stepping is supposed to be a newer modification of the CO stepping, and not yet available here in the US (although coming soon).

Anybody got a better read on all this?
 
WebDude, there is no 3000+ newcastle with the CO stepping. What is the SKU on your processor? Remember the original 3000+'s were clawhammers with half the cache disabled. I am downloading cpu-z right now to check it out. i know for a fact my 3000+ is not a newcastle.

Hope that helps

Kristopher
 
Kristopher,
Looks like CPU-Z is giving me bad info. I used CPUIDMAX, and it says I have a Clawhammer. Here are both readouts: link
I'm not sure what the sku on my cpu is. I'll have to get inside the box and take the heatsink off to know for sure.

But I'm still confused about the new 'CG' stepping. Are all new 'CG' steppings Newcastles? Or is that something different? I found this page via a Google search, can't read it all (foreign language), but the chart clearly indicates the 'CG' stepping are Clawhammers. link
Or is this mistaken info too?
 
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