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On AMD64 processors with the new CG stepping: how to distinguish

As you know, during the life cycle each processor undergoes several technological revisions that result in the new steppings with new or improved features. The new CG stepping of AMD Athlon 64, Mobile Athlon 64 DTR, Mobile Athlon 64, Athlon 64 FX processors will differ from the previous C0 by some serious improvements, mostly energy saving.

More information of CG stepping is provided in the AMD Athlon 64 Processor Power and Thermal Data Sheet v3.11 updated in January 2004. The Athlon 64 with the new CG stepping has the new marking. E.g. desktop Athlon 64 marks...


...now have the following additions:



According to this document, the same is made to other desktop and mobile AMD64 processors with the new stepping.

Our colleagues from Heise.de compiled a table of the old- and new-stepping processors:

CPUClockOld stepping New stepping
Athlon 64 (ClawHammer, 512/1024 KB L2 cache), Socket 754
3400+ (1024KB L2)2200MHzC0 (F48h)
ADA3400AEP5AP
CG (F4Ah)
ADA3400AEP5AR
3200+ (1024KB L2)2000MHzC0 (F48h)
ADA3200AEP5AP
CG (F4Ah)
ADA3200AEP5AR
3000+ (512KB L2)2000MHzC0 (F48h)
ADA3000AEP4AP
CG (F4Ah)
ADA3000AEP4AR
Mobile Athlon 64 DTR (ClawHammer, 1024KB L2 cache), Socket 754
3400+ (1024KB L2)2200MHzC0 (F48h)
AMA3400BEX5AP
CG (F4Ah)
AMA3400BEX5AR
3200+ (1024KB L2)2000MHzC0 (F48h)
AMA3200BEX5AP
CG (F4Ah)
AMA3200BEX5AR
3000+ (1024KB L2)1800MHzC0 (F48h)
AMA3000BEX5AP
CG (F4Ah)
AMA3000BEX5AR
Mobile Athlon 64 (ClawHammer, 1024KB L2 cache), Socket 754
3200+ (1024KB L2)2000MHzC0 (F48h)
AMN3200BIX5AP
CG (F4Ah)
AMN3200BIX5AR
3000+ (1024KB L2)1800MHzC0 (F48h)
AMN3000BIX5AP
CG (F4Ah)
AMN3000BIX5AR
2800+ (1024KB L2)1600MHzC0 (F48h)
AMN2800BIX5AP
CG (F4Ah)
AMN2800BIX5AR
Athlon 64 FX (SledgeHammer, 1024KB L2 cache), Socket 940
FX-51 (1024KB L2)2200MHzC0 (F58h)
ADAFX51CEP5AK
CG (F5Ah)
ADAFX51CEP5AT

And now let´s describe the changes that the new stepping implies. Note this table of features of Athlon 64 (Desktop) with CG stepping:


As you can see, the Cool´n´Quit technology was changed in these processors. Unlike C0-stepping chips which have energy saving mode at 800MHz, 1.30V and respective 35W TDP, the CG stepping differs by Cool´n´Quiet at 1000MHz, but 1.10V and thus 22W TDP. The full-clock mode remains the same 1.5V and 89W TDP, however they added another intermediate energy-saving state for Athlon 64 3400+, p-State #2 at 1.80GHz and 1.30V.

Another significant change in the new stepping is the reduced requirements for AMD64 interface logic energy consumption: now Desktop, DTR and Mobile Athlon 64 models have I/O Power at 160mW (vs. 600mW for the previous stepping). Athlon 64 FX have this value reduced from 1.4W to 0.4W.

Despite that the new stepping has the same TDP, the new "relieved" modes mean the significant offload of CPU cooling systems and the improvement of the thermal conditions in general.

Whether all these improvement are useful, only the tests will tell. Still don´t forget that all of them are actual for motherboards which BIOS supports Cool´n´Quiet.

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